Low Cost Strategy Essay

Ease technique is one of the three nonexclusive advertising procedures. Organizations utilize this technique to offer low cost in its items/benefits by concentrating on different focuses in its worth chain exercises. So as to be a fruitful ease rival in a serious situation, organizations center around a few issues; which all go from the methods of edge improvement (as far as expanding income and lessening cost) and resource adequacy (in the feeling of limiting working capital and augmenting winning on resource). At the end of the day, we can say that minimal effort contenders center around effectiveness in its all exercises by reclassifying and reducing expenses in their worth chain. Here are various traits which minimal effort system centered organizations make or follow so as to be serious and have feasible ease techniques: †¢ Forming association in certain exercises which is unreasonably expensive for the organization to do without anyone else and additionally redistributing fabricating exercises to ease nations. For instance, Huawei Technologies (which is bringing in and creating PBX phone items) made association with 3Com and Siemens so enter new markets and furthermore by utilizing its some other serious qualities it outcompetes Cisco (notable worldwide system producer) inside 5-6 years. †¢ Minimizing unpredictable and costly exercises, for example, innovative work, item structure and advertising; and normalizing items and plans. †¢ Having no-additional assistance yet with the best utilization of benefit use. For instance, Southwest Airlines brings down its expenses by no-ruffle benefits yet in addition accomplish to expand its benefits by restoring the plane from the entryway to the air inside exceptionally brief timeframe (around 20 minutes). †¢ Combining low-cost with item separation. For instance, Japanese retailer Muji as a contender to Wal-Mart and IKEA. It is significant for an ease procedure centered organization to recognize and manage other ease contenders as ahead of schedule as conceivable before they become solid and effective rival in advertise. Along these lines, organizations ought to consider their outside condition particularly its rivals so as to have the option to turn out to be increasingly serious and acquire piece of the pie as an ease supplier. There are 4 different ways of breaking down serious condition: 1) Identifying company’s ease rivals: Possible by recognizing and reacting potential minimal effort contenders on schedule; in view of centering ease methodologies against to the organization. 2) Performing a complete cost investigation: Made by recognizing a likely dangers from organizations which are progressively proficient in their item and administration costs. ) Building up every single possible situation: Company makes consider the possibility that situations by away from of the market and competitor’s reasonable abilities so as to plan better for future. 4) Determining company’s best key moves: For this situation organization utilizes its imagine a scenario where situation understandings in a manner to have the option to contend and beat its ease rivals. While creating company’s key moves to increase higher piece of the overall industry and supportable serious edge, administrators ought to create both momentary strategies and long haul techniques. Momentary strategies permit organization to make more grounded its qualities and furthermore gain time for the required investigation to have the option to grow long haul methodologies while keeping minimal effort matches in a place that doesn't dangers the organization. These strategies incorporate contribution low-value item/benefits or giving some other deal motivators, a few lawful activities, for example, patent encroachment claims, item/administration separation and in conclusion centering increasingly appealing and beneficial clients by letting unfruitful ones to rivals. These momentary strategies likewise, permit organization to keep up piece of the overall industry just as addition manageability in its activities. Long haul procedures alter organizations to changing economic situations and furthermore permit them to seek after new market openings. These systems may be less secure than short-terms’ however bring more benefits. Long haul system incorporates offering separated items, extending items/administrations, going into new topographical regions, turning out to be ease pioneer or having minimal effort auxiliaries, putting resources into innovation and in conclusion improving client administrations. For instance, IBM was selling PCs as a first mover however then it began to sell separated result of programming by offering administration arrangements too when Dell and Gateway began to sell lower evaluated PCs. In general, so as to have the option to effectively contend with other ease equals and have manageability as a minimal effort rival in the market; Firstly, organization must examine its interior and outer condition by characterizing its own and furthermore competitors’ advertise positions and likely dangers to the organization. Besides, organization must be activity arranged by utilizing its qualities and upper hand to wipe out early recognized expected dangers for the organization in future. In conclusion, organization must build up a solid strategy to help its effective rivalry in the market by going into the new markets and growing new items on the time and furthermore adjusting other vital strategies as speedy as could reasonably be expected.

I can tell Essay Example

I can reveal to Essay Example I can tell Paper I can tell Paper I can tell, think, and accept that my online conduct is the same when I am face to face with others throughout the day however actually I act in an unexpected way. I am a self observer essentially, my vitality when Interacting with others Is gotten from having the option to disguise and dissect my musings instead of voice them until I am prepared. If I somehow managed to go into a packed room, my inclination Is to watch my environmental factors first and when prepared, I would move toward somebody as opposed to Jump directly Into a discussion. At the point when I convey on the web, I am entirely agreeable to hop directly in; I eve no worries or feel uncomfortable, as I am not exposed to the physical or enthusiastic angles identified with beginning a discussion. Secrecy is an amazing power. Holing up behind a phony screen name causes us to feel strong, just as undetectable (Bernstein, 2012, Para. 7). Studies on outgoing or independent practices online have indicated that PC intervened correspondence may bring about all the more friendly conduct particularly among incredibly thoughtful or timid individuals (Magical-Hamburger, Winnipeg Fox, 2002; McKenna Barge, 2000). Blamer and During 2012) contend that the apparent obscurity and separation of PC interceded correspondence help conquer social Inhalations. Milan (2012) portrayed how individuals will in general misrepresent their persona when online on the grounds that there Is more opportunity to overhaul and figure the substance they present than In unconstrained up close and personal Interactions. Perceiving my character type, being independent I do act any other way since it is simpler for me to conquer my social hindrances. My enthusiastic response to online news and data is needy upon how energetic I am on the topic or the association it makes dependent on my own encounters. For example, my capacity to feel sympathy for the casualties off catastrophic event makes me question what the people are experiencing, what they think and feel as I see and hear their looks and responses. My endeavor to answer being completely human In a virtual space got more enthusiastically to reply than I Initially suspected. My Interpretation of this incorporates one having the option to really do everything they can when In person riches a virtual domain. I think about the reproduction game Second Life, that reflects all parts of humankind set In a pretend situation.

Dont believe everything that you read

Dont believe everything that you read Someone emailed to me a funny post from one of those rumor-filled college admissions discussion sites; this one made me laugh out loud: I found the secret on guarenteed [sic] Admissions to MIT This comes directly from someone who has a friend that goes there and knows the admission council very well. They have a criteria of 5 things, and if you achieve 2 of the 5 you are in. 1. USAMO 2. ISEF 3. 1600 4. 4.0 (unweighted) 5. I forgot what the last one was, but it was some weird national award. So if any of you think getting the perfect score isnt important, it is, youre half way there. My friend acheived all 5 things, and hes mad as hell because he didnt need to waste 2 months on ISEF research and he couldve already gotten in with his 1600 and USAMO qualification. They told him AFTER he was admitted. Let me emphatically state for the record: There is no guaranteed way to be admitted to MIT. Certainly, it is true that students who have achieved a national or international degree of excellence in math, science and engineering will tend to fare well in MIT admissions. But do any of the above things, or anything else, guarantee admission? I think not. We admit people, not numbers or achievements.

Hobbes And The Natural State Of Man - 1617 Words

Thomas Hobbes was a divisive figure in his day and remains so up to today. Hobbes’s masterpiece, Leviathan, offended his contemporary thinkers with the implications of his view of human nature and his theology. From this pessimistic view of the natural state of man, Hobbes derives a social contract in order to avoid civil war and violence among men. Hobbes views his work as laying out the moral framework for a stable state. In reality, Hobbes was misconstruing a social contract that greatly benefited the state based on a misunderstanding of civil society and the nature and morality of man. In order to analyze Hobbes’s work of moral and political philosophy, one must first understand his view of human nature. Hobbes’s was greatly influenced by the scientific revolution of the early 17th century, and by the civil unrest and civil war in England while he wrote. Hobbes views the nature of man as being governed by the same laws of nature described by Galileo and refined by Newton .He writes in Leviathan â€Å"And as we see in the water, though the wind cease, the waves give not over rowling (rolling) for a long time after; so also it happeneth in that mation, which is made in the internall parts of a man† . From this, he concludes that man is in a constant state of motion. Being at rest is not the natural state of man, but rather a rarity. From this turbulent view of man, Hobbes goes on to describe the natural state of man. The natural state of man is one of war inShow MoreRelatedTopic sentence. Thomas Hobbes interpretation of natural law is not only radically different, but1300 Words   |  6 Pagessentence. Thomas Hobbes interpretation of natural law is not only radically different, but inconsistent with the traditional view. This can be seen through the similarities and differences found when comparing Thomas Hobbes theory, and Thomas Aquinas’ theory in regards to their view of man’s ultimate goal, their defi nition of natural law in regards to its relationship with human rationality, and lastly how they view the meaning and relationship of divine providence and religion in natural law. The followingRead MoreEssay on The Natural Ways of Locke, Hobbes, and Rousseau1207 Words   |  5 PagesThomas Hobbes, and Jean-Jacques Rousseau introduce their varying opinions surrounding man in nature. The western philosophers mainly concern themselves with the concept of the social contract. Rousseau, Hobbes, and Locke begin with the conception of the individual, because in the natural state, they all believe that man is an independent character. Each of the philosophers used their revolutionary concepts to challenge power, yet their arguments differ dramatically. Through their texts, Hobbes, LockeRead MoreHobbes And Rousseau s Views On The State Of Nature868 Words   |  4 Pagesdifferent views on one central issue. For example Thomas Hobbes, and Jean Jacques Rousseau interpret a Man’s Nature very differently from each other. The discussion over Man’s Nature brings light to Hobbes underlying reason of why people established political societies, and Rousseau’s question of what causes a mans misery? In Hobbes case he believes that Men need to find self-protection in order to shield themselves from men’s natural state of misery and fear. On the other hand, Rousseau didn’t seeRead MoreRousseau s View On State Of Nature1551 Words   |  7 Pagesargument of the state of nature often comes into discussion. However, two mainstream philosophers Thomas Hobbes and Jean- Jacques Rousseau have similarities, but mostly have multiple different ideas on this theory. Although Hobbes makes valid points Rousseau s view on s tate of nature is more realistic then Hobbes. Rousseau’s view on the state of nature is interpreted as a forest, and refers to the â€Å"savage man†. He begins by explaining how he relates man to an animal he states â€Å"when I strip thatRead MoreHuman Nature Is Good, And Being A Beast1165 Words   |  5 Pages Thomas Hobbes was an English philosopher, and the author of Leviathan. Hobbes declared that human life was â€Å"solitary, poor, nasty, brutish, and short†(Hobbes, 107). Hobbes felt that the natural state of man was beast-like, and savage. Thus, he felt that it is civilization that influences and challenges humanity from our fundamental wickedness. Within his view, human nature is dangerous; which can only be rescued through culture and community. According to Hobbes, being â€Å"civilized† is good, and beingRead MoreComparison of Thomas Hobbes and Jean-Jacques Rousseau Essay1092 Words   |  5 Pageswritings of Thomas Hobbes and Jean-Jacques Rousseau. Through Thomas Hobbes world-renowned publication Leviathan and Rousseau’s discourses on basic political principals and concepts, each man validated their thoughts on human nature and what is required for a successful society within their respective government confines. The distinct differences between Hobbes and Rousseau’s opinions on the natural state of man frame the argument of the different parenting styles the each man would inevitably applyRead MoreCompare and Contrast John Locke and Thomas Hobbes1028 Words   |  5 PagesMan: The Social Animal Brian Greaney Political Science 230 Prof. T. Mullins April 18, 2011 John Locke and Thomas Hobbes were two main political philosophers during the seventeenth century. Hobbes is largely known for his writing of the â€Å"Leviathan†, and Locke for authoring An Essay Concerning Human Understanding. Included in their essays, both men discuss the purpose and structure of government, natural law, and the characteristics of man in and out of the state of nature. The two mensRead MoreCompare And Contrast Hobbes And Locke1391 Words   |  6 Pages Hobbes and Locke in State of Nature and War. Introduction Without a doubt, Hobbes with his work Leviathan and Locke with his treatises on The Civil Government illustrated a before and after regarding Philosophy and politics of the sixteenth and seventeenth centuries. The historical events in England such as the English civil war (Hobbes) and the war against France (Locke) marked both scholars and influenced their thoughts to match and oppose naturally. However, both made a significant contributionRead MoreEssay about Comparing Hobbes and Lockes Versions of the Social Contract1349 Words   |  6 PagesComparing Hobbes and Lockes Versions of the Social Contract Thomas Hobbes, author of Leviathan, claims that peace and unity can best be achieved by setting up a society by having humans agree to a covenant (Hobbes: Ch.18 pg.548). A sovereign who is in charge of protecting the society or state rules Hobbes’s society. In his introduction, Hobbes describes this commonwealth as an artificial person and as a body politic that mimics the human body. Hobbes portrays the state as a gigantic humanRead MoreThe Theory Of Property And Property Rights900 Words   |  4 Pagesphilosophers have struggled to describe. The renowned political theorists Thomas Hobbes and John Locke hold vastly different opinions in regard to the concept of property. In 1651, Hobbes outlined his views in his book, Leviathan, where he discusses societal structure and his social contract theory. Almost forty years later, Locke published his Second Treatise of Government, in which he described mankind’s state of nature, and natural rights. These two works expressed n ear complete opposite viewpoints in regards

Human Trafficking The Violation Of Human Rights

Human Trafficking What is the most basic of all human needs? One might answer food, water, and shelter. What is the most basic of all human rights? It should go without saying that the most basic of all human rights is freedom or personal liberty rather than bondage or slavery. If being free rather than in bondage is a human right, why is it that so many are held in bondage against their will? United Nations According to the United Nations website, Human Trafficking is defined as: The recruitment, transportation, transfer, harbouring or receipt of persons, by means of threat or use of force or other forms of coercion, of abduction, of fraud, of deception, of the abuse of power or of a position of vulnerability or of the giving or†¦show more content†¦The Means involves threat or use of force, coercion, abduction, fraud, deception, abuse of power or vulnerability, or giving payments or benefits to a person in control of the victim. The Purpose is for the purpose of exploitation, which includes exploiting the prostitution of others, sexual exploitation, forced labour, slavery or similar practices and the removal of organs. Much time, effort, reporting, and research on the subject has provided valuable insights into trafficking patterns, however there still remains a lack of quantitative information regarding the scope and hard numbers of people affected by h uman trafficking around the world. This is due to the nature of the crime and its hidden element. The UNODC helps States to draft laws and to create comprehensive national anti-trafficking strategies and it also offers assistance with resources to implement them. Participating States receive specialized training assistance to help develop cross-border cooperation when it comes to investigations and prosecutions. According to the UNODC, the adoption in 2000 by the United Nations General Assembly of the Protocol to Prevent, Suppress and Punish Trafficking In Persons, Especially Women and Children marked a significant milestone in international efforts to stop the trade in people. A vast majority of States have since signed and ratified the Protocol. However, at this time very fewShow MoreRelatedHuman Trafficking And Human Rights Violations846 Words   |  4 PagesHuman trafficking is one of today’s egregious human rights violations. Traffickers focus on the most vulnerable mem bers of society, preying mostly on women, and children, yet men are also trafficked in high numbers. Trafficking of a person refers to the, â€Å"illegal trade of a human being for sexual exploitation or forced labor through abduction, force, threat, or fraud† (UNOC 2015). Human trafficking can come in many forms such as, sex exploitation, forced labour, as well as forced donor-ship. TheRead MoreHuman Trafficking Is A Serious Violation Of Human Rights1639 Words   |  7 Pagesâ€Å"Human trafficking involves the recruitment, transportation, harbouring and/ or exercising control, direction or influence over the movements of a person in order to exploit that person, typically through sexual exploitation or forced labour† (Public Safety Canada, 2015). It is also called a modern form of slavery. According to one estimate about 2.4million people around the globe are trafficked annually (Golbya, Sian Hsiang-Te Zacharias, 2015). In Canada alone, currently, 56 human traffick ing casesRead MoreHuman Trafficking- The Escalating Global Violation of Human Rights1355 Words   |  6 PagesHuman Trafficking- The Escalating Global Violation of Human Rights Human Trafficking is a serious Global matter that violates a multitude of the Human Rights articles outline in The Universal Declarations of Human Rights. Thousands of individuals are subjects of Human Trafficking every year; the perpetrators of this crime do not discriminate, targeting men, women, the young and the old all over the world. Human Trafficking is indeed a Global issue, occurring in nearly every country on the planetRead MoreHuman Trafficking Is A Serious Crime And An Unrefined Violation Of Human Rights1578 Words   |  7 PagesTrafficking in human beings is a serious crime and an unrefined violation of human rights. It is often linked to organized crime and is one of the most profitable criminal activities worldwide (Access to European Union Law, 2014). There are many different forms of human trafficking, and they progress with changing socioeconomic circumstances. It targets women and men, girls and boys in vulnerable positions (Trafficking in Human Beings, 2013). Th e International Labor Organization in June of 2012 coveringRead MoreHuman Trafficking Is A Grave Crime And A Serious Violation Of Human Rights1555 Words   |  7 PagesHumana Trafficking Introduction Human trafficking refers to the practice of recruiting, transferring, transporting, receiving, or harboring people through the use of force, threat, or other forms of abduction, coercion, deception, fraud, as well as abuse of power or vulnerability position (Segrave 2). Human trafficking is a grave crime and a serious violation of human rights as it involves a broad range of human exploitations, including forced labor, sexual exploitation, slavery practices, as wellRead MoreHuman Trafficking : A Serious Crime And A Direct Violation Of Human Rights1138 Words   |  5 PagesIntelligence Question: How human trafficking is currently impacted by increased law enforcement coverage at the southwest border aimed at reducing illegal alien smuggling into the country? Summary: Human trafficking is a serious crime and a direct violation of human rights. It can be defined as an illegal trade of human beings in which they are treated as possessions to be controlled for labor intensive work like slavery, or exploited by being forced into prostitution. Every year, millions of peopleRead MoreHuman Trafficking And Slavery : A Violation Of The Universal Declaration Of Human Rights3225 Words   |  13 PagesGlobal Overview Human Trafficking and Slavery universally happens in the world when individuals are placed or maintained in and exploitive situation for economic gain. Women, men and children are trafficked for a range of different purposes; forced and exploitative labour in factories, farms and private households, sexual exploitation, and forced marriage. Trafficking can happen to all people if the circumstances are right. Human trafficking and slavery is in direct violation of the Universal DeclarationRead MoreWomens Rights Violation: Human Trafficking in Indonesia Essay1814 Words   |  8 PagesHuman trafficking is a global human rights issue, where women are the biggest target. Human trafficking is defined as the transport of a person through force, threat or abduction to then bind the person to its employee or for exploitation reasons. The term exploitation includes: prostitution, other sexual exploitations, slavery, forced labour, servitude and the removal of organs (United Nations Convention Against Transnational Organized Crime, 2000). This essay is focusing on women’s rights, by lookingRead MoreSex Trafficking Is As Serious Crime And An Act Of Violation Of Human Rights2056 Words   |  9 Pages Sex Trafficking in Minors Umar Cheema CUNY- John Jay Human trafficking the modern day slavery; is as serious crime and an act of violation of human rights. The United Nations (UN) defines human trafficking as; the recruitment, transportation, transfer, harboring or receipt of persons, by means of threat or use of force or other forms of coercion, abduction, fraud, deception, the abuse of power or a position of vulnerability or the giving or receiving of payments or benefits toRead MoreSex Trafficking : A Serious Crime And A Grave Violation Of Human Rights1876 Words   |  8 Pages Human trafficking is â€Å"a serious crime and a grave violation of human rights† according to the United Nations Office on Drugs and Crime (What is Human Trafficking - UNODC). Sex trafficking is also recognized as the sexual exploitation of human rights, especially those of women and children (UNODC). Sex trafficking and sex work are major issues within feminist debates with differing opinions. Due to its underground and discreet nature, it is difficult to determine how prevalent it is and what different

Chemistry Review Chapters 1 †2 Free Essays

Chemistry Review sheet: Unit 1- Lesson 1, 2 *Key notes to keep in mind* u Metals have a high low ionization energy u Non-metals have a high electron affinity  · Atom: The basic unity of an element which still retains the elements properties  · Atomic number: the unique number of protons in the nucleus of a particular element  · Isotope: Atoms of the same element which contain a different number of neutrons  · Periodic law: The chemical and physical properties of the elements repeat in a regular, periodic pattern when they are arranged according to their atomic number. Periodic trend: a pattern that is evident when elements are organized by their atomic numbers o Trends for atomic size: As you go down a group the atoms get bigger. o As you go down a group, valence electrons occupy and energy level that is farther and farther from the nucleus. We will write a custom essay sample on Chemistry Review Chapters 1 – 2 or any similar topic only for you Order Now Therefore the rings of electrons underneath the valence atoms shield the valence electrons from the nucleus so that the atom isn’t pulled in as tight as the one before it. o Trends for atomic size: As you go down a periodic table, atoms get smaller Because the protons increase as you go down a period, the positive charge on tighter to the nucleus rather looser. o Trends for ionization energy: Ionization energy tends to go down a group o As you go down a period the attraction between the nucleus and the electrons in the outer energy level decreases. o Ionization energy tends to increase across a period. o As you go across a period the attraction between the nucleus and the electrons in the outer energy level increases. Therefore, more energy is needed to pull an electron away from its atom. Lewis structure: a symbolic representation of the arrangement of the valence electrons of an element  · Octet: an arrangement of eight electrons in the valence shell of an atom  · Ioniz ation energy: the energy that is needed to remove an electron from a neutral atom  · Atomic mass unit (u): a unit of mass that is 1/12 of the mass of a carbon-12  · Radioisotope: an unstable isotope of an element, which undergoes radioactive decay  · Mass number: The total number of protons and neutrons in the nucleus of one of its atoms. Each proton or neutron is counted as one unit of the mass number. Energy level: fixed, three-dimensional volume in which electrons travel around the nucleus.  · Valence electron: an electron that occupies the outermost energy level of an atom.  · Stable octet: an arrangement of eight electrons in the valence shell of an atom.  · Electron affinity: the change in energy that accompanies the addition of an electron to an atom in the gaseous state.  · Cation: a positively charged atom.  · Anion: a negatively charged atom. Theories: Law of Conservation of mass: During a chemical reaction, the total mass of the substances involved does no t change. Law of Definite Proportions: Elements always combine to form compounds in fixed proportions by mass. (Eg. Water always contains the elements hydrogen and oxygen combined in the following proportions: 11% hydrogen, 89% oxygen) Lesson 3 Ionic and Covalent compounds  · Chemical Bonds: the forces that attract to each other in compounds. o BONDING INVOLVES THE INTERACTION BETWEEN THE VALENCE ELECTRONS OF ATOMS WHICH USUALLY CREATES A MORE STABLE BOND THAT AN ELEMENT ON ITS OWN.  · Ionic compound: between a non-metal and a metal where the metal loses an electron and the non-metal gains it Characteristics of an ionic bond consist of:  § Normally happens between a metal and a non-metal  · Metals tend to lose electrons, non-metals tend to gain them.  § Very high melting point  § Easily dissolved in water  § Good conductor of electricity, in water or on its own.  · Covalent compound: a bond between two non-metals (or a metal and a non-metal when the metal has a high electron af finity), where atoms share electrons o Characteristics of a covalent bond consist of:  § Low melting point  § When contained under high pressures or temperatures, becomes liquid  § Weak conductor of electricity Somewhat soluble o Polar covalent compound: a bond where the electronegativity is not great enough to completely bond to the other atom. Although, it does move closer to an atom, it never completely bonds. (between 0. 5 and 1. 7) This therefore means that when the electrons are partially exchanged, rather than having a + or – sign, they receive a ? + or ? – symbol  · Electronegativity: the measure of an atoms ability to attract electrons in a chemical bond. (EN) the opposite of atomic size which therefore means that as the atomic size increase, the electronegativity decreases If the electronegativity difference is 0. 00-1. 6 the bond is covalent. o If the electronegativity difference is over 1. 7 and up the bond is ionic.  · Octet rule: atoms bond in o rder to achieve an electron configuration that is the same as the electron configuration a noble gas. (8 valence electrons)  · Isoelectric: when two atoms or ions have the same electron configuration. (e. g. Cl and Ar)  · Molecular compounds: See covalent bonds  · Intramolecular forces: the forces that bond covalent bonds together  · Intermolecular forces: the forces that bond ionic bonds together Metallic bonding: in order to combine two metals both metals lose their valence electrons and combine them in a free flowing â€Å"sea† of electrons so that the electrons are shared equally by all atoms that join the bond.  · Alloy: a homogeneous mixture of two or more metals.  · Lone pairs: electron pairs that are not involved in bonding  · Bonding pairs: electron pair that are involved with bonding.  · Polar molecule: a molecule with a partial negative charge on one end and a partial positive charge on the other end.  · Non-polar molecule: a molecule that has nei ther a positive nor negative end. How to cite Chemistry Review Chapters 1 – 2, Essay examples

Who Does Paul Bennett Work For Religion Essay Essay Example

Who Does Paul Bennett Work For Religion Essay Essay Paul Bennet works as portion of the Apostolic Church, now known in New Zealand as the ACTS motion. ACTS covers over 60 churches in New Zealand and has been established since 1934. The ACTS churches provide a bible based, Pentecostal environment for people to turn and link with Jesus Christ. Therefore go and make adherents of all the states, baptizing them in the name of the Father and the Son and the Holy Spirit, and learning them to obey everything I have commanded you. And certainly I am with you ever, even to the terminal of the age. ( P1100, Women s Devotional Bible, NIV ) . What is the ACTS motion making? Planting and edifice Churches committed to populating out the cardinal rules of the Gospel. We will write a custom essay sample on Who Does Paul Bennett Work For Religion Essay specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Who Does Paul Bennett Work For Religion Essay specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Who Does Paul Bennett Work For Religion Essay specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Making an environment for the release of new apostolic enterprises with the accent being on new churches being founded and webs being developed within the apostolic motion. Adding value to local churches so they can be more effectual in making this coevals with the love of God. Partnering together with other ministries so they can be more effectual ( ACTs Movement. 2009 ) . What are the beliefs of the ACTS motion? God is raising an ground forces of laborers who are focused and committed. They have a simple trust in the power and anointment of God. They are ordinary people who believe in an extraordinary God ( ACTs Movement. 2009 ) . What do they populate for? The cause of Jesus Christ. A sense of mission and fate Structure of the ACTS Movement National Leadership Team National Leader Bruce Monk Equippers Church Hawkes Bay Lyle Peninsula Equippers Church Auckland Sam Monk South Life Church Dunedin Paul Bennett Vision Churchs Nick Klindenbery Invercargill Christian Centre Ian Wright Figure 1 National Office Staff Executive Manager Administrator Office Manager Figure 2 South Life Church Mission Statement We are people populating to see many others turn and follow Jesus. SouthLife Church believe that it is non about run intoing up on Lords daies for church services but about sharing their lives during the hebdomad and doing life together ( South Life Church, 2010 ) . Statement of Belief As a church we believe in: The one true and living God who everlastingly exists in three individuals in integrity: Father, Son and Holy Spirit. The Godhead inspiration and authorization of the Holy Scriptures. The original flawlessness of creative activity ; the built-in corruptness of humanity through the Fall ; the necessity of penitence and regeneration by grace and through religion in Christ entirely, and the ageless separation from God of the eventually impenitent. The virgin birth, impeccant life, expiating decease, exultant Resurrection, Ascension and go oning intercession of our Lord Jesus Christ, His 2nd approaching and ageless Kingdom reign. The justification and sanctification of trusters through the finished work of Christ, their security as they remain with Him, and their future Resurrection in an incorruptible organic structure. The sacraments of baptism by submergence and of the Lord s Supper. The baptism of the Holy Spirit for trusters with supernatural marks, authorising the Church for its mission in the universe. The gifts of the Holy Spirit for the edifice up of the Church and ministry to the universe. Christ s leading of the Church through the Ascension ministries of apostles, Prophetss, revivalists, curates and instructors, for the integrity, adulthood and growing of the Church. As taken from www.southlife.org.nz Figure 3 Background on Paul Bennett Leadership Position Senior Pastor in a criterion concern he would be the Chief Executive Officer. Curate Paul has been in his present place since 2001, a sum of nine old ages. Duties Oversing the ministry and pastoral attention in and out of church is the footing of this place. Pastoral attention is about constructing trust and apprehension within the community and administrating to those in demand ( Diocesan School of Girls ) . This is a duty that is shared among staff and it is besides a manner of networking within the community although that is a side benefit. Ministry covers distributing the Gospel, and supervising three folds South Life, Taieri Life and Clutha Life. A batch of clip is spent in run intoing with staff and national squad members that there is an answerability factor to. Staff meetings non merely include work related issues but encompass debriefing Sessionss where advocate is offered in countries of challenge to the person. Curate Paul plots the projections for the undermentioned twelvemonth in countries such as where the church is heading, staffing issues and degrees, capable stuff for discourses and learning subjects. This takes up a batch of clip as does the legion meetings ( Bennett, 2010 ) . Accountability Paul Bennett is straight responsible to the ACTs Movement, there is a supervisor assigned to the church debriefing one time a month. Elders within the church besides meet with Pastor Paul one time a month to travel over fundss and see any suggestions that may be raised. Previous Leadership Roles Previous leading functions include being captain of the football squad, Foreman, freelance with staff, Youth Pastor and Associate Pastor. Curate Paul commented that he has ever been a leader. Leadership Style Curate Paul considers himself to be the Dad , he envelops the sense of a household concern. The penchant is to walk aboard people, nevertheless, he is rather able to call the shootings if need be. He does nt believe in forcing people along in their functions, preferring to discourse and brainstorm. Depending on who he is covering with, his manner of leading can alter, for illustration with one individual he may hold a treatment and make a common determination whereas with person else they may necessitate more way. This manner has been adopted because of Pastor Paul s belief in household. He believes that by following a household type atmosphere the staff will purchase into a greater ownership of their outlooks and duties. Examples of Leadership manner An illustration of where this manner of leading has worked good can be seen in the age group of the church South Life is based in the thick of the pupil country of Dunedin and the fold reflects this as they have an eventide service aiming the pupils specifically which is good attended. Their young person curates are besides a good illustration of the leading manner working good as they treat the church like place and are hold oning leading enthusiastically giving it a spell . Where the leading manner has possibly worked non so good would likely be in Pastor Pauls ain age group and older. This is due possibly to the you ca nt state me what to make and the convince me type attitudes of the older coevalss. The other factor at times is some people merely do nt wish his manner of taking and there is nil that is traveling to alter their heads. The worst incident that could be recalled is where a parishioner ended up shouting at him and doing baseless accusals in the heat of the minute. The Theory of Servant Leadership TDIndustries ( TDI ) believe that servant leaders are active hearers. Their basic values use to all facets of their concern and lives. They are an American installation that specialises in mechanical building ; the company is an first-class illustration of servant leading in action within the profit-making sphere of concern. It is besides based on the same criterions as an administration such as the church. Paul Bennett touched on all facets in some signifier and this adds weight to the belief that this signifier of leading manner works good. Although on the surface Pastor Paul appeared to be a collaborative leader when fiting up the features of servant leading it became clear this was the class that applied ( Gavin A ; Mason, 2004 ) . TDI based their whole concern around this construct and have turned it into a multi-million dollar venture with their ain employees puting to a great extent. TDIndustries Valuess Concern for and belief in Individual Human Beings Valuing Individual Differences Honesty Constructing swearing relationships Fairness Responsible Behaviour High Standards of concern moralss They besides believe in Long-run ends Continuous intense people and development attempts, including significant developing budgets. Investing in tools, equipment and installations that enable us to better carry through their mission. Fig 4 Taken from hypertext transfer protocol: //www.tdindustries.com/AboutUs/overview.aspx Contrasting Business Entity When asked if he would make anything otherwise if he was working for a high profile company like MacDonald s, Pastor Paul was rather inexorable that he would non. He believes staff should experience like a portion of the procedure and a portion of the solutions. His belief sees the church as being no different to a concern as ownership is of import. When households represent the parents they try to make good, and Pastor Paul would desire his workers to make the same to hold a sense of ownership and belonging. Environment of Change When asked about how good he deals with issues like altering beliefs ( that is, political rightness ) , altering engineering and statute law Pastor Pauls attitude was comparatively positive. Technology is embraced if there is a benefit to be had out of it and there is person to learn how to utilize it. Political rightness is understood but non ever agreed with, sometimes its usage is helpful but sometimes it is non. Quotation mark: Political rightness gets in the manner of truth and solution. Curate Paul Bennett, 2010. Legislation is over managed and there is a inclination for direction to go a albatross around administrations. He believes that it is frequently a reactionist procedure. Effectss of alteration on leading When covering with alteration in his leading function Pastor Paul mentioned the followers: We need to be solutions non hinderances or victims. There is a demand to be progressive. What does it look like? What will the alteration really do, seek visualizing the alterations it will intend. He does non wish some alterations but it does non bug him and he does non believe he tends to be reactionist in response. Changes are dealt with better due to the leading manner he has adopted but he believes if it ai nt broke make nt repair it but if you are making something that is non utile that is working allow us repair it . An illustration of this last statement would be the Missions Board that was in pattern when he took over his function as Senior Pastor. Although the church was involved in missions the fold had no apprehension of what it was. The existent mission work was successful because it was non understood. The missions board was disbanded and another set up in due class with the folds more straight involved. Serrat ( 2009 ) believes that leading is hard as it must center on the challenge of alteration . Transformational alteration does non come easy ; there are many issues that are value-laden that have to be considered. These issues include truenesss and struggles. Exerting leading is about adaptative alteration being encouraged as opposed to proficient alteration that is addressed on a day-to-day footing. A consequence of this type of alteration can be stress or instability while the version is in advancement. Abraham Lincoln made a celebrated address on 19 November 1863 known as the Gettysburg Address. His concluding words as he dedicated the battleground as a national graveyard are still impacting today as a definition for the kernel of democracy by many. aˆÂ ¦government of the people, by the people, for the people . Abraham Lincoln, 1863, Gettysburg Address. This is a similar construct to the ACTS Movement with their linking people, associating churches, associating states belief. Therefore it is logical to put them in this class of servant leading. In fact, in the motions ain belief this is where they see themselves ( Serrat, 2009 ) . Servant leading is frequently linked with distributed leading which is an attack that views taking as a societal contract. The accent moves from making leaders to developing leaderful administrations. The construct envelops way giving, a less formal leading, handling taking as an activity that is shared by more than one leader and fostering the growing of leading abilities in others ( Serrat, 2009 ) . There are surely elements of this within the SouthLife Church when the disposal within the church is looked at. There is an Executive Curate who deals with the majority of the finance. An administrator trades with a assortment of undertakings which includes bulk mail and travel agreements. There is a portion clip receptionist who does typing but besides helps out in multiple countries when needed. There are in entire, four full clip staff, five portion clip, four voluntaries and five housemans. The encouragement the squad is given can surely be seen as distributed leading as they are frequently given duties that stretch their abilities. Without a societal contract this growing would non be possible. Challenges in leading The challenges Pastor Paul faces in his function are dissatisfactory people, excessively much administrative work, countries that may impact others in a large manner and at times conflict. Before traveling into a state of affairs affecting struggle he will seek and visualize the result so he can outdo make up ones mind how to manage the issue. Additional Thoughts on Leadership Curate Paul believes there are people born to take and people that are non. If you know you are non a natural leader make non travel at that place nevertheless if you know you are put everything you have into it. He stresses that it must be remembered that there are degrees of leading and that his belief in no manner reflects on those in in-between direction. This belief of leading is reflected on a personal degree every bit good with the remark being made that you have to be a leader of your ain life and you need to pull off yourself good. When asked what leading means to him, Pastor Paul said that it is the difference between life and decease, in the instance of the church if it is non lead well it will decease. He added that a batch of churches are non led good and have dropped off and that sometimes systems do nt let leading. Other manners of leading Modern twenty-four hours analysis has created multiple classs of leading manners. Many features cross over doing it difficult to nail a unequivocal remarkable manner. Larue ( 2004 ) believes few leaders use one manner. In the church environment statistics show more than half of curates consider shepherding and span edifice to their leading manners when given a list to choose from. It is this writers belief that although they can be considered manners in their ain right they both come under the covering of servant leading. A inclination illustrated by a figure of cross-cultural surveies show a stronger fond regard by leftists to their administrations. On probe thefreedictionary.com web site defined Bolshevism as a way that characterizes the thought of a group or state. Interpersonal relationships take precedence over occupation cognition and accomplishments. In contrast people in individualistic civilizations look to satisfying their ain ego involvement as the drive force. Transactional leadings tend to fulfill this outlook as it focuses on short term ends intending speedy satisfaction ( Jung A ; Avolio, 1999 ) . Karlene Kerfoot ( 2007 ) believes that when a groups societal values are non considered a leader can sabotgge their effectivity. The first measure in assisting move public presentation to a higher degree is being able to place the groups societal individuality. The best work is accomplished by those making precisely that every bit good as edifice on a shared vision.

23 Anthropology Essay Topics on Dorset Culture

23 Anthropology Essay Topics on Dorset Culture One of the cultures discussed during anthropology course is the Dorset culture. Since your instructor would want you to read more about it, you may be tasked with an essay on it. In order to make yours stand out from the rest of the class and ensure that you get a good grade as a result, use the following facts to support your essay. The timeline of the Dorset Culture is divided into four periods: The Early (beginning around 500 BCE) Middle Late (beginning around CE 800) Terminal (between CE 1000 to 1500) It is evident from various digging sites of the Dorset that the Thule migrated from east of Alaska during the Terminal period. The expression â€Å"Cape Dorset Culture† was coined by Diamond Jenness in 1925. While studying the mixed collections that came from the Hudson Strait Area and Cape Dorset on Baffin Island, Jenness deduced that the culture existed before the Thule. Dorset and later the Thule people were the civilization which the Norse encountered when they visited the area. Calling them skrà ¦ling, which means ‘primitive people’, the Norse noted that they were strong and gigantic in structure, but easily scared. The Dorset Culture existed in Foxe Basin, which is a shallow oceanic basin north of Hudson Bay. They primarily resided in the areas of Nunavik, Labrador, Newfoundland and Low Arctic of Nunavut. Common objects found at Dorset sites include snow knives. This indicates that this civilization had knowledge and experience in making snow houses, which are now known as Igloos. Dorset people had great interest in carved objects, especially bears, fish and birds carved from bone, wood, ivory. They are considered the pioneers in carving artwork as none of the artefacts dating before their arrival were carved with such finesse. The Newfoundland Museum houses a substantial collection dug from Dorset sites. The collection includes Polar Bears, Human Figures, Birds, Human Skull and many other artifacts. Most of these represent the Dorset’s beliefs, especially with regards to the supernatural. Nature aside, various archaeologists assume that the Dorset people’s artwork was mainly inspired from their spiritual beliefs. Although the Dorset people did trade with the Thule, they did not favor the idea of mingling with them and chose to remain isolated. Anthropologists assume that their art is what they used to differentiate themselves from the Thule. The Dorset Civilization descended from Paleo-Eskimos of the Pre-Dorset Culture in 2000-500 BCE. By comparison, the Dorset people had a more prosperous economy and lived in permanent snow and turf-made houses. The earlier Dorset people did not hunt land animals such as caribou or polar bear because they did not have proper hunting tools like the arrow and bow. They survived by hunting sea mammals like the seal, which they hunted by cutting holes in the ice. In the Nunavik region, the late Dorset populations mainly hunted all mammals except the large whales or fed on migratory birds. They were fond of collecting various species of plants as well. There is no genetic connection between the Dorset and the Thule people. This shows that intermarriage between the two cultures did not happen. However, there was trade of knowledge between them as the Thule engaged in seal-hole hunting after migrating. Seal-hole hunting was not part of the Thule’s tradition, which could mean that the Dorset people must have taught them this skill. According to some scholars, Sadlermiut were the last remnants of the Dorset culture, as their culture and dialect differed from the mainland Inuit. This theory came to light during a mitochondrial DNA research in 2002. Another similar research in 2012 showed no link between the Sadlermiut and the Dorset. The hunting technology of the Dorset Culture included small triangular end-blades which they hefted onto harpoon heads. The harpoons were then used to hunt seals as well as larger sea mammals such as the walrus and narwhals. The Dorset people used soapstones to make lamps and relied on seal oil to fuel them. They used these lamps for heating and illuminating their homes during long, cold and dark winter months. The Dorset people had ice-creepers which resemble the modern Alaskan ice-creeper. However, the Dorset Ice-creeper may have been inspired by a similar object before it was replaced altogether in that region. Traditionally settling on coasts, the Dorset civilization lived in small tent rings that often included axial features. Their houses were generally subterranean, and their tents were skin-covered in summer time. This shows that they were more inclined towards the sea than their descendants, the Palaeo-Eskimo, as most of their houses were exposed to headlands and outer islands. They also had structures that resemble long houses, which they used in periods of extreme winter. During this time, Dorset families gathered and lived under a single roof. Dorset people used to live in small, close-knit communities. Each village consisted of no more than 20 to 30 people. The Late Dorset flintknappers were capable of producing a wide number of lithic materials such as slate, basalt, agate, quartzite and soapstone. These were then used for making a variety of weapons and knife blades. The Dorset people often used driftwood for construction. It was rarely used, though, because it was not being brought in continuously due to long distances. It is believed that the Dorset people had transportation means to travel through sea as well as on land. There is evidence suggesting that they made sleds, which were either pulled by hand or animals. Some archaeologists also believe that the Dorset built Kayak-like Boats. A large number of bones found at Dorset sites were of various bird species. They were presumably captured by nets or on open water when they could not fly during molting season. The Dorset culture started to disappear from the Labrador around 1500 years ago. They disappeared entirely from Greenland and the Canadian arctic. Their initial displacement from outside of the island of Newfoundland may have been due to the Thule. Why did the Dorset People disappear is still under-debate. Thule people had a strong history of warfare and had better hunting weapons then them, which is probably why conflicts between the two civilizations may have eliminated the former. However, the Medieval Warm Period may have threatened the existence of the Dorset population beforehand. These should give sufficient insights for you to write an anthropology essay on Dorset culture. Additionally you may check our 20 topics and 1 sample essay on Dorset culture as well a complete guide to write an essay paper  in  anthropology. References: Michael Fortescue, Steven Jacobson Lawrence Kaplan (1994): Comparative Eskimo Dictionary; with Aleut Cognates (Alaska Native Language Center Research Paper 9) Robert McGhee (2005): The Last Imaginary Place: A Human History of the Arctic World Robert McGhee (2001): Ancient People of the Arctic Plummet Patrick, Lebel Serge (1997). Dorset Tip Fluting: A Second American Invention. Arctic Anthropology 34 (2): 132–162. Renouf M.A.P. (1999). Prehistory of Newfoundland Hunter-Gatherers: Extinctions or Adaptations?. World Archaeology 30 (3): 403–420 Bonvillain, Nancy. The Inuit. Chelsea House Publishers, 1995 britannica.com/topic/Dorset-culture

Sharknado Will Teach You All About Blogging

Sharknado Will Teach You All About Blogging Sharknado. It spawned 5,032 tweets per minute at its peak (about 84 tweets each second)for a movie about a hurricane that spawns tornadoes filled with sharks that bring down people, helicopters, and houses. What can you possibly learn from this movie about writing, beyond the fact that people will watch anything scripted for the SyFy channel? At first glance at the amazing poster, it seems pretty clear that there is little about blogging and content marketing in the movie. **SPOILER ALERT** The sharks dont win. Sure, they get in a few good bites, but in the end, the hero prevails and its messy.  In the interest of learning something meaningful from all of lifes experiences, even the ridiculous ones, can writers find anything of value from Sharknado and its messy heroic win? #Sharknado is a treasure trove of great writing advice. #NoReallyMost certainly. After watching Sharknado, you will realize that, as a writer, you need to: 1. Think on your feet. A change in the blogging schedule meant I had 40 minutes to write and publish a post. Those werent ideal conditions, but  I did it.  I cranked out the blog post, and sent it on to my team to peer review. Hayden responded back, after reviewing the post. I literally thought as I read: heres what 10+ years of blogging and disciplined writing gets you, he said, and it was the first time I realized that constant long-term blogging gives you the skills to think on your feet when you have to. Long-term practice makes it possible for you to think on your feet. It will happen. Youll have about 30 minutes to write a blog post. Can you do it?  Youd better have a process, the confidence, and the ability to write out of nowhere. Which leads to the next point 2. Maintain situational awareness. In Sharknado, the sharks were coming from every direction–air, land, water, living room–and the hero had to be aware of his surroundings to stay alive. In those moments when you have to think on your feet, youll need situational awareness. To pull off that last-minute blog post, I referred to a list of running ideas I am constantly tracking. Im always making note of blog ideas because in those intense moments,  youd better have something in the bank. And to get those things, youll have to be aware of how just about anything could be a blog post and bank those ideas.

Synthesis of Research Problem, Method, and Design-Hypothetical Designs Paper

Synthesis of Problem, Method, and Design-Hypothetical Designs - Research Paper Example These challenges, which include dishonesty and plausible misjudgments, threaten the quality of results obtained through this process. Certain measures have, however, been put in place, to ensure high quality, and error free results. There is little or no attention given to the efficiency and throughput of the crowdsourcing process or the integrity of the results obtained. It is argued that the numbers of task workers and tasks are always small, thereby, resulting in crowdsourcing techniques that are not conscious of the number of tasks, potential worker behavior and efficiency of the process. This research aims at proposing a crowdsourcing, result-improvement technique that is independent of task complexity and sizes and ensures result quality, integrity, as well as efficiency and throughput of the process. The hypothesis being studied in this case is that crowdsourcing result-improvement techniques that are task size and complexity independent ensures result integrity, quality, effi ciency as well as throughput. Hypothetical Designs Quantitative design This design will utilize experimental research method - methods that aim at maximizing replicability, generalizability, and objectivity of results; mostly concerned with prediction (Creswell, 2009). The focus will be to test several existing crowdsourcing techniques including r-Redundancy, v-Voting, and Vote Boosting techniques on a large number of tasks that will be handled by a large number of users. These techniques will be considered as experiment participants. The independent variable in this case would be the crowdsourcing techniques, including r-Redundancy, v-Voting, Vote Boosting techniques and the technique that this research will propose. The independent variables will be studied in two level; low task, less complex task level, and high number of tasks, and complex tasks level. Consequently, the dependent variables will be integrity, quality, efficiency as well as throughput. The experiment will be set in such a way that, the tasks set for testing, will have two definitive parameters including the accuracy of the tasks initial states and the number of options available per decision. 8 sets of 100,000 tasks with 3, 4, or 5 options and 75%, 85%, and 95% as the accuracy for the initial set tasks. There are about 4 to 10 decisions distributed normally. The user network or population tested also has two parameters including mean probability for committing errors and for dishonesty. Values of 3%, 6% and 20% are used for both dishonesty and making of errors. These probabilities were distributed exponentially over [0, 1] around their mean values. Simulations for about 40 input-aggregation functions with each one receiving one input are run repeatedly. For this experiment, the proposed quantitative hypothetical design is deemed to be extremely expensive even in the event that only few points in a parameter space are covered. Qualitative Design In this case, this research method will aim at understanding and discovering the perspectives, thoughts and experiences of previous researchers and participants in the same field in order to understand reality, purpose and meaning (Trochim & Donnelly, 2008). The focus will be to review and evaluate literature on previous and current research

Effect of Greek Financial Crisis on the British Economy Essay

Effect of Greek Financial Crisis on the British Economy - Essay Example During the early days of 2010 sovereign debt was a subject of attention for the whole world. Sovereign debt is the total debt owed by a sovereign country like Greece to its creditors. As a result of this crisis, there was a panic in the financial market worldwide and euro suffered a huge decline in its value. Greece was helped by the EU and IMF to provide them with loans that could rescue the situation. This can be a short term solution to the problem but the obligations of long term debt will still persist or may even get worse (Abboushi, â€Å"Abstract†). David Cameron in one of his statements warned that British economy will suffer more due to this euro zone crisis. It remains a threat to the future of euro. There had been a decline in the growth rate of employment, especially in public sector of UK. The investors are losing confidence in the market and the financial market in UK suffered a setback. A deep recession is on the cards if the situation is not handled carefully. More support for the banking sector is needed and the Government should be forced to take some emergency steps to help improve the financial system, before the crisis worsens further. Even though Britain is not a part of euro zone, still budgetary deficit concerns of the country should be addressed immediately. British banks already hold a considerable amount of debt in Greece, which can be an area of major concern. Moreover, with Greece defaulting to pay their debts, the problem can spread over nations like Spain and Italy where UK has a much larger investment. In addition to this, euro zone is one of the biggest trading partners of UK, so obviously this crisis can have an impounding effect on UK’s economy if other big European economies falter (PRLog, â€Å"How the Greek economy can affect us all†). 2. Changes in the NHS led by the UK Government UK government took a bold step towards reforming National Health Services (NHS) in the country. There had been many major changes in NHS structure due to this decision of UK government and it is for the first time in the history of NHS that such radical changes are taking place. Hospitals are no longer under NHS. General Practitioners (GPs) and not the management bodies now have a huge role and responsibility and are in charge of major part of the budget. This move resulted in abolition of all the 10 strategic health authorities as well as 152 primary care trusts which are the management bodies of NHS. Most of the budget of NHS is now in the hands of GPs only and they have the authority to plan out things accordingly. The GPs are now to decide on the spending of NHS. This new re-structuring of NHS gives way to the development of a new board which is independent of any kind of political influence. It is completely an independent body now and has control over its own accountability. Health of public is now the responsibility of local authorities. NHS industry is now more of a top-down design with GPs sit ting at the top level. The patients are now being provided with more information through ‘HealthWatch’, a new type of body specially designed for the purpose. The patients now have the option to choose the GP according to their own wish and get registered with them. Since its inception in the year 1948, NHS has never experienced such drastic changes. Now the question remains as to what benefits these changes will bring to the people and the

Microstructure-mechanical Property Relationships

Microstructure-mechanical Property Relationships Microstructure-mechanical property relationships in high strength low alloy steels for automotive applications Chapter 1 Introduction The production of steel is an ancient process which has evolved over time. Where and when Steel was first created is unknown and a topic of much debate, however most historians believe earliest production of steel originates from China from as early as 202BC. A later form of steel named Wootz Steel was later developed in India, which used wind power to fuel a furnace producing nearly pure steel. In the 11th century China developed steel further was the first country to mass produce steel. Two methods were developed. A berganesque method which produced inhomogeneous steel, and a process which that relied on partial decarbonisation through repeated forging under a cold blast, this was seen as the superior method, and one which lead on to the Bessemer process [1].The Bessemer process involved using a blast furnace to extract iron from its ore and is the basis of modern steel extraction. Steel is produced firstly by extracting iron from its ore. Iron extraction differs slightly from other metals as it can only be found naturally in oxide form. This means that a smelting process is required. This involves a reduction reaction followed by alloying with additional elements like carbon to stabilise and strengthen the steel. Iron smelting requires a high temperature which produces a ferrous material made of a combination of iron and steel. The addition of alloying elements such as carbon affect the materials properties greatly. Changing the temperature at which the iron is smelted affects the phase of the resultant steel, giving rise to the possibility of producing steels with varying properties which are suitable for a range of applications. In the automotive industry, body frames were originally made of hardwood. This was replaced in 1923 when the American Rolling Company developed steel sheet production. The wooden frames were inferior in energy absorption which was a big safety issue. Steel was also much easier to form than wood and did not warp over time. As the automobile has evolved over time, there has been an increasing public awareness of the environmental impact of the car. This has forced manufacturers to produce lighter cars which are more economical. This brought about the development of thin, highly formable sheet steel. The main competitor to steel in the automotive industry is Aluminium, which offers a much better strength to weight ratio and also a better resistance to corrosion. However steel is still the most commonly used material mainly due to lower production cost. Increasing competition from aluminium is forcing the development of modern steels. Steel naturally has a higher formability and elongation than aluminium which is one of the reasons it is used so extensively in the automotive sector. This can be seen in Figure 1.1: Figure 1.1- Yield strength vs total elongation of aluminium alloys and automotive steels [3] Ultra low carbon (ULC) steels are used commonly in the production of automobiles. Their, highy formability and suitability for hot dip galvanising make them very attractive to automobile producers[4]. Pressure is being put on the manufacturers to produce lightweight cars that minimise emissions without compromising safety. Metallic properties required to achieve this consist of a high tensile strength, high r- value, good ductility and also the ability to be made resistant to corrosion (either naturally or through the use of chemical surface treatment). Various high performance steels have been developed to meet these requirements, of these, one of the most important being HSLA steels. High strength low alloy steels provide a much better strength to weight ratio than conventional low carbon steels allowing for thinner grades to be used, saving weight. HSLA steels have a manganese content of up to 1.5%, as well as microalloying elements such as vanadium and titanium. HSLA steels are increasingly replacing traditional low carbon steels for many automotive parts. This is due to their ability to reduce weight without compromising strength and dent resistance. Typical applications include door-intrusion beams, chassis members, reinforcing and mounting brackets, steering and suspension parts, bumpers, and wheels [5]. High strength low alloy steel properties are determined by the way in which they are processed. High deep drawability, can be achieved through precipitation of elements by annealing to produce a strong {111} recrystallisation texture [7], producing highly formable steels which are very desirable for automotive applications. In this study, two grades of IFHS strips are studied. A titanium only stabilised steel grade and a titanium-vanadium stabilised steel grade. These have been treated using a Viking tube furnace and studied using a scanning electron microscope, Photoshop and Optilab Software. Both steel grades have been studied using carefully selected thermo mechanical heat treatment cycles. The heating variables are expected to cause varying effects to the mechanical properties and microstructure of the two materials. The addition of vanadium in one of the steel grades is also expected to influence the mechanical properties. With the data obtained from my experiments I hope to determine the optimum processing route for similar HSLA steels. Chapter 2 Aims Carry out selective batch annealing heat treatments on two microalloyed High Strength IF strip steels. Measure grain size evolution samples using scanning electron microscopy and quantitave optical microscopy techniques. Measure mechanical properties of obtained samples using hardness and tensile testing techniques Determine the optimum processing characteristics, resulting in optimum mechanical property characteristics. Chapter 3 Literature Review 3.1 AUTOMOTIVE STEELS Automotive manufacturers make use of many different metals in the production of cars, of which the most predominant being steel. This is for several reasons, steel is relatively easy to recycle in comparison with polymers and aluminium, and this is an issue which is growing in importance as the public are becoming more and more environmentally aware. Steel is also a very good material in terms of its practicality, as it is easily welded, has good formability, elongation and ductility. As the environmental impact of cars is becoming more and more important, stringent regulations regarding emissions are being forced upon manufacturers. One of the ways that manufacturers have chosen to meet these requirements is to make the cars lighter by switching from mild steel to high strength steel grades which enables components to have a thinner cross section, saving weight. The three main types of steels used in automobiles today are; Low strength (IF and mild steels), High strength (Carbon manganese, bake hardening, IFHS and HSLA) Advanced high strength steels (dual-phase, complex phase, transformation induced plasticity and matensitic steels) These steel types can be seen below on figure 3.1 comparing their elongation and strength. Figure 3.1: Classification of automotive steels [8]. 3.1.1 Mild Steels Mild steels are normally found in two different forms for automotive purposes. Drawn Quality and Aluminium killed. These are both cheap to manufacture are used for high volume parts. They are usually of a ferrite microstructure. [8] 3.1.2 Interstitial Free Steels IF steels are used for car body panels extensively due largely to their deep drawability. The high elongation achieved in comparison with other steel grades can be seen in figure 3.1.The main characteristic of IF steel is a low carbon and nitrogen content. These elements are removed from solution by adding specific elements for alloys. Commonly used elements for this microalloying process include Manganese, Sulphur, Titanium and Niobium. As well as a deep drawability, IF steel have low yield strength but a poor dent resistance which is undesirable for certain automotive applications [6] Bake Hardening Steels BH steels keep carbon in solution either during processing before it is precipitated or during the paint baking state [8]. This strengthens the steel through solid solution strengthening, resulting in steel with both high formability and high strength. 3.1.4 Carbon-Manganese Steels Carbon-manganese steels are solid solution strengthened and are used in strip form on automobile bodies, although they are becoming replaced by lighter steel grades. They offer high drawability and are relatively cheap to produce. [9] D.T.Llewellyn: Steel: Metallurgy and Applications, Butterworth-Heinemann Ltd, Great Britain, 1992. 3.1.5 High-Strength Low-Alloy (HSLA) Steels HSLA steels are strengthened through the addition of microallying elements. These react with the carbon and nitrogen within the steel to form carbides and nitrides. Common elements include Nb, V and Ti. The resultant steel has both high strength and a high formability due to very fine grain sizes [10] Dual-Phase (DP) Steels Dual-phase steels contain two phases within their microstructure. These are ferrite and martensite. This two phase structure is produced through a complex series of contolled heating and cooling. Martensite regions are produced by heating and rapidly cooling. It is the marteniste regions tha give the hardness to the material where as the ferrite regions are much softer. The structure of DP steels takes advantages of the properties of each of the phases, where the hard maternsite regions are surrounded by softer ferrite which reduces brittleness, shown in figure 3.2. DP steel has good ductility, low yield strength but high work hardening rate [8]. Figure 3.2: Microstructure of DP steel [8]. 3.1.7 Transformation-Induced Plasticity (TRIP) Steels TRIP steels consist of a mainly ferrite microstructure with a low austenite content within the matrix. An isothermal hold during production at an intermediate temperature is used to produce bainite [8]. Strength is increased by transformationing of austenite regions to harder martensite regions. TRIP steels have a good work hardening rate and good strength. Work hardening in TRIP steels continues at higher strain levels than those of DP steels so TRIP steels is a superior material from this aspect. Figure 3.3 shows the multi phase microstructure of TRIP steel. Figure 3.3: Microstructure of TRIP steel [8]. Martensitic (MS) Steel MS steels are mainly of a martensitic microstructure but contain small amounts of ferrite and bainite. During heat treatment the steel is rapidly cooled transforming austenite into martensite. This gives a very high tensile strength since martensite produces a very hard material, but the drawback is this also gives a low formability. In order to overcome this low formability further processing such as heat treatments must be undertaken. [11] 3.1.9 High Strength Interstitial Free (HS-IF) Steels HSIF steels are strengthened through the addition of microalloying elements. Commonly used alloying elements include P, B, Si, Mn, Ti, N. The combinations in which the microalloying elements are used have an effect on the properties of resultant steel allowing a range of requirements to be met. HSIF steels can produce nearly twice the potential yield strength as conventional IF steels, although there is a reduction in formability. 3.2 Microalloying Elements 3.2.1 Carbon Carbon is one of the most important interstitial elements within steel, giving very different mechanical properties as its percentage content is altered and therefore must be studied in depth. Carbon is an element commonly found in automotive steels due to its high strength properties. Although adding carbon increases strength, it also affects the formability, i.e. its deep drawability. A set of experiments were carried out to determine the effect of carbon content within steel. When analysing the tensile test results it was noted that the ultimate tensile strength, the proof stress and the yield stress all increased as the amount of carbon increased in the steel. The plastic region as well as the general elongation of the steel under tensile stress decreased as the carbon content increased. These are significant changes in the mechanical properties. Hardness and Tensile strength increase as carbon content approaches 0.85% C as shown in figure 3.4. The elongation percentage decreases as the carbon content increases. This suggests that the more carbon present in the material, the stronger and less ductile it becomes. Figure 3.4: Affect of Carbon content in Steel Yield Strength Carbon content influences the yield strength of steel because carbon molecules fit into the interstitial crystal lattice sites of the body-centred cubic arrangement of the iron molecules. The interstitial carbons make it more difficult for any dislocation to occur as it reduces mobility. This has a hardening effect on the metal. Phase diagram Using the phase diagram one can understand why the properties of steels change with differing carbon content. Figure 3.5: Phase Diagram The gamma phase, relates to an Austenite range which has a Face Centred Cubic (FCC) structure. The alpha phase relates to a ferritic Body Centered Cubic crystal structure. Ferrite is found extensively in automotive steels, its BCC structure is much less dense than the FCC of austenite which makes it easily formable and therefore relatively cheap to manufacture. Fe3C refers to cementite and the mixture of alpha (ferrite) + cementite is called pearlite. On the phase diagram steels only apply up to about 1.4% carbon. The eutectoid point is at 723 degrees and is where there are three phases in equilibrium. The eutectoid composition is Fe-0.83%C. The reaction that happens at the eutectoid point is: austenite > ferrite + cementite gamma > alpha + Fe3C High carbon content means a greater precense of austenite, whereas low carbon content will give less austenite and a more ferritic microstructure. The affect of these differing microstructures is reflected in their mechanical properties. This is because Ferrite is soft and ductile and Cementite is hard and brittle. It can be seen by looking at figure 3.5 that as the carbon content is increased, strength increases. This relationship occurs up to the eutectoid point after which it starts to reduce. This where cementite grain-boundaries are created. The figure below shows how the varying content of carbon in steel affects its properties and suitability for different applications. Figure 3.6 Carbon Steel Applications Lever rule The lever rule can be used to calculate expected proportions of the phases present in each of the tested carbon steel specimens. These values can then be compared to the values obtained through testing. Figure 3.7 Lever Rule Calculations: a = Ferrite a + Fe3C = Pearlite 0.1wt%C Normalised Steel Tensile Specimen: % Ferrite = (0.8- 0.1)   Ã‚   = 0.897   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8-0.02) % Pearlite= (0.1- 0.02)    = 0.103   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8- 0.02) 0.4wt%C Normalised Steel Tensile Specimen: % Ferrite = (0.8- 0.4)   Ã‚   = 0.513   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8-0.02) % Pearlite= (0.4- 0.02)    = 0.487   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8- 0.02) 0.8wt%C Normalised Steel Tensile Specimen: % Ferrite = (0.8- 0.8)    = 0   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   (0.8-0.02) % Pearlite= (0.8- 0.02)   = 1   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   (0.8- 0.02) These results suggest that as the carbon content increases the pearlite to ferrite ratio also increases. So the ratio of Pearlite to ferrite increases as carbon content is increased the material is made harder, stronger and more brittle but less ductile. These results obtained using the lever rule support the results obtained from the tensile test, showing the steel with the highest carbon content to be the least ductile and most brittle. The results are also supported by the findings from the hardness test which shows the steel with the highest carbon content to be the hardest. 3.2.2 Titanium The addition of Titanium to IFHS steels is particularly useful in the manufacturing of strip steels where good drawability is a requirement. The addition of Ti or Nb results in a lower Yield Strength/Tensile Strength ratio giving an increased formability. This can be seen in figure 3.8. When Titanium reacts with Carbon and Nitrogen it forms TiC and TiN, these precipitates work to delay recrystallisation of austenite, thus refining the grains to a favourable smaller size [12]. Figure 3.8: The effect of Titanium and Niobium on Yield Srength/UTS ratio [12] Titanium precipitates exist within steels and these affect the mechanical properties. TiN precipitates help to promote recrystallisation and encourage the {111} texture. TiS precipitates are commonly found in the austenite region as well as Ti4C2S2, Ti4C2S2 is formed by reacting with Carbon and in the highest regions of the austenite range there is little to no Carbon. These conditions are created at very high temperatures similar to those during hot rolling processes. This leaves the steel highly formable and suitable for deep drawability application such as car body panels. It is very difficult however to form Ti4C2S2 as it is less stable than TiS, although it can be encouraged through specific heat treatment processes. [13] 3.2.3 Vanadium Titanium is commonly added with Niobium to steels to increase formability through precipitation. However these additions can result in a retardation of recrystallisation meaning a higher temperature or longer soaking time is required for recyrstallisation to occur. Vanadium offers a replacement to Niobium in the form of carbides and nitrides, VC and VN, which does not cause such a drastic retardation of recyrstallisation. This is attractive to manufacturers as lower temperatures and shorter processing time during annealing are more cost effective. The effectiveness of Vandium in essentially lowering the recrystallisation temperature is shown in Figure 3.9. Figure 3.9: The effect of Ti + Nb, Ti + V and V stabilised steels on the Temperature for Complete Recrystallisation in 30 Seconds [44]. Figure 3.9 shows that the V only stabilised steel recrystallises at a lower temperature than the TiV and TiNb steels. 3.2.4 Sulphur Sulphur is found in all steels including Interstitial Free High Strength Steels. It acts as an interstitial elements and other elements to form precipitates such as TiS, MnS and Ti4C2S2. These precipitates have different effects on the mechanical properties of the material. In particular the precipitation of carbosulphides is beneficial to the steel as this causes the steel to form in the austenite range and helps to reduce the TiC formation which could occur during heat treatment processing and cause the material to become less likely to form the {111} texture.[13] Promoting Ti4C2S2 therefore encourages the formation of the favourable {111} texture, increasing the formability of the material. In order for Ti4C2S2 to develop, Sulphur, Carbon and Titanium must all be present, and processed in such a way as to form a reaction, which can difficult. 3.2.5 Niobium Niobium if found extensively in IFHS Steels reacting with carbon to form carbides such as NbC. Solute Niobium can be used to segregate austenite and ferrite grain boundaries and increase the strength of the austenite region [14]. As Niobium content increases the r-value decreases as well as the ductility. Generally Nb content is minimised as much as possible as the positive effect it has on strength in the austenite region is relatively small and is outweighed by the negative effect it has on ductility. Boron can be used instead of Niobium as it has a much greater effect on strength than Niobium. This can be seen in figure 3.9 Figure 3.9: Average Flow Stress vs. Temperature for B, C, and Nb and Mo solutes in steel [15]. 3.2.6 Phosphorus Phosphorus, P, is a common alloy of IFHS steel, offering increases in strength through solid solution hardening. Adding Phosphorus can also have a direct effect on the grains within a structure by increasing the Hall-Petch slope (described below). Adding P however can have a negative effect on the brittleness of the material. This can be particularly problematic during the cold working process where brittle fracture is a distinct possibility. The Hall-Petch relationship says that as the grain size decreases the yield strength of a material increases. This is due to the dislocations piling up at grain boundaries, which act as barriers to dislocation movement at low temperatures. If the grain size is large, then a high number of dislocations will pile up at the edge of the slip plane. When the stress exceeds a critical value the dislocations cross the boundary. So the larger the grain size, the lower the applied stress required to reach this critical stress at the grain boundary, meaning the larger the grain size, the lower the yield stress due to easier dislocation movement. This is true down to a grain size of 100nm. Below this size the yield strength remains constant or starts to decrease. This is effect is called the reverse Hall-Petch effect. Phosphorus along with Silicon and Manganese are added via solid solution strengthening to strengthen steel allowing for a thinner sheet of metal to be used for car body panels, and thus reducing the weight. Phosphorus is the most effective out of the three elements in terms of cost and strengthening effect. This can be seen below in figure 3.11 where the effects of P and S additions are compared. Figure 3.11: Comparison of Stress vs. Temperature between Phosphorus and Silicon microalloyed Steels [16]. Phosphorus is also found in the form of FeTiP precipitates. These precipitates have a negative affect on strength and drawability. The effects of these precipitates are greater in batch annealed steels than in continuous steels. This is due to the long soaking times required in batch annealing which provides optimum conditions and sufficient time for these precipitates to form [17]. 3.2.7 Manganese Manganese is added through solid solution strengthening to IFHS steels in a low concentration in order to react with the Sulphur to produce MnS precipitates. These MnS precipitates act to refine grain structure during processing when there is a transformation in phase between austenite and ferrite. Mn is to strengthen steels through solid solution strengthening. The effect of Mn is relatively small in the austenite range but compared to the ferrite range. This is due to a difference in Mn solubility between the austenite and ferrite ranges. Where Mn in ferrite is 10wt% higher than in austenite [18] Mn acts to stabilize the austenite region and slows down the rate of austenite transformation and also the temperature at which the transformation takes place. This lowering of transformation temperature between austenite and ferrite promotes finer grains through grain refinement. Mn can be found in oxide and sulphide forms as well as combinations of the two, oxysulphides. These oxides and sulphides act to deoxidise and desulphurise the steel. When in sulphide form, MnS helps to reduce embrittlement of steel without reducing hardness. When mixed with common impurities such as Al2O3, SiO2, MnO, CaO, CaS and FeS an increase in hardness and strength occurs [19]. When in the oxide form, MnO at the surface acts a barrier layer to prevent surface oxidisation and corrosion. 3.2.8 Silicon Silicon is a useful element and is used to increase the strength through solid solution strengthening, although there is a compromise as increasing Silicon content decreases ductility. Silicon is also found in oxide form, as silicon dioxide. Silicon dioxide is found with Manganese Oxide or as Silicomanganese to give a strong oxygen stabilisation and prevent corrosion of steel. [20]. 3.2.9 Aluminium Aluminium is used to deoxidise steel by reacting with oxygen within the steel to form Al2O3. These Aluminium Oxides are later removed leaving an oxygen free steel. However the low density of Aluminium means that oxidisation could occur at the steel interface resulting in corrosion. Aluminium content can have a negative effect on formability. This is due to the precipitation of AlN during recrystallisation preventing the {111} development and thus preventing the formation of finer grains. So minimising the amount of AlN in solid solution results in higher formability. A more stable alternative to AlN which is commonly used in IFHS steels is TiN. 3.3 Hardening and processing There are many different compositions of steel which offer various advantageous properties. The main reason for altering composition or alloying is to strengthen the material. This can be done in several ways; 3.3.1 Precipitation strengthening This process uses heat treatment to raise the yield strength of a material. As temperature changes during heat treatment processing, fine particles are produced due to differing melting points of impurities. These fine particles impede dislocation movement. This in turn reduces the ductility and plasticity of the material and increases its hardness. 3.2.2 Solid – solution strengthening Solid solution strengthening is a form of alloying. It is a commonly used technique to improve the strength of a material. Atoms of the alloying element are added to the crystal lattice of the base metal via diffusion. There are two ways in which this can occur, depending on the size of the alloying alloying element. These are via substitutional solid solution, and interstitial solid solution. Substitutional solid solution This takes place when the sizes of the alloying atoms are equal in size to the base atoms, (Differing in size by no more than 15% according to the Hume-Rothery rules) The alloying atoms replace the solvent atoms and assume their lattice positions. The solute atoms can produce a slight distortion of the crystal lattice, due to the size variation. The amount of distortion increases with the size of the solute atom. This distortion has an effect on microstructural properties. The formation of slip planes is altered making dislocation movement more difficult, meaning a higher stress is required to move the dislocations. This gives the material a higher strength. A generalisation associated with substitution is that large substitutional atoms put the structure under compressive stress, and small substitutional atoms give tensile stress. Interstitial solid solution This occurs when the alloying atoms are much smaller than the base atoms. The alloying atoms fit into spaces within the crystal lattice. This is the case with carbon in steel, where carbon is a solute in the iron solvent lattice. The carbon atoms are less than half the size of the iron atoms so an interstitial solid solution forms. 3.3.3 Processing The final properties of steel are greatly affected by the manner in which it is first made and then processed. Typical processes include steel making, casting, hot and cold rolling and annealing. Each individual process has a distinct affect on the properties of the steel. To make the steel free from interstitial elements, Ti and Nb are often added to react with interstitials after a process called vacuum degassing. Vacuum degassing is the name given to the process where a metal is melted within a vacuum and the gasses are evaporated out. Hot and cold rolling Hot rolling is the first process to take place after steel making. After steel has been cast into uniform slabs or billets it is the rolled under a high temperature to reduce its cross sectional thickness. The hot rolling process is undertaken at a temperature above that at which recrystallisation occurs. Hot rolling reduces allows recrysallisation to occur during processing (dynamic recrystallisation) and the material is left stress free due the new grain nucleation and equiaxed grains. Effect of hot working on microstructure: Hot working occurs at high temperatures, this means that there is often enough thermal energy present for recrsytallisation to occur during deformation. This is called dynamic recrystallisation and it occurs with most metals, apart from aluminium. Recrystallisation occurs during the working process and also as the metal is cooling. Dynamic recrystallisation occurs by new grains nucleating at existing grain boundaries. The amount of recyrstallisation depends on several factors. It depends on the strain rate, temperature and amount of strain on the metal. Generally, as strain within the metal increases, so does the amount of recrystallisation. Cold working is when steel is plastically deformed below its recrystallisation temperature. This process increases the yield strength due to the plastic deformation causing slight defects within the microstructure of the metal. These defects make it difficult for slip planes to move. The grain size of the metal is also reduced, making the material harder through a process called Hall petch hardening. Hall Petch hardening, also known as grain boundary strengthening, increases materials strength by altering the grain size. This is because grain boundaries act as barriers to dislocation movement. So altering the grain size, through hot and cold rolling at various temperatures and rates will have an effect on dislocation movement and yield strength. Cold working will increase the strength of the metal by making it increasingly difficult for slip to occur. However as more and more of the larger grains split to form smaller grains the ductility is greatly reduced as the material hardens. Eventually fracture would occur. To avoid this, the material is annealed. Cold working occurs at a temperature below 0.4 of the metals melting point. Some of the energy created by the process is expelled as heat but some energy is stored within the structure putting it into a high energy state. The energy is stored within the grain boundaries of the deformed crystals and within the stress fields of the dislocations created through the plastic deformation. The structure is highly stressed after cold working and would prefer to return to its former low energy state. It is howeve Microstructure-mechanical Property Relationships Microstructure-mechanical Property Relationships Microstructure-mechanical property relationships in high strength low alloy steels for automotive applications Chapter 1 Introduction The production of steel is an ancient process which has evolved over time. Where and when Steel was first created is unknown and a topic of much debate, however most historians believe earliest production of steel originates from China from as early as 202BC. A later form of steel named Wootz Steel was later developed in India, which used wind power to fuel a furnace producing nearly pure steel. In the 11th century China developed steel further was the first country to mass produce steel. Two methods were developed. A berganesque method which produced inhomogeneous steel, and a process which that relied on partial decarbonisation through repeated forging under a cold blast, this was seen as the superior method, and one which lead on to the Bessemer process [1].The Bessemer process involved using a blast furnace to extract iron from its ore and is the basis of modern steel extraction. Steel is produced firstly by extracting iron from its ore. Iron extraction differs slightly from other metals as it can only be found naturally in oxide form. This means that a smelting process is required. This involves a reduction reaction followed by alloying with additional elements like carbon to stabilise and strengthen the steel. Iron smelting requires a high temperature which produces a ferrous material made of a combination of iron and steel. The addition of alloying elements such as carbon affect the materials properties greatly. Changing the temperature at which the iron is smelted affects the phase of the resultant steel, giving rise to the possibility of producing steels with varying properties which are suitable for a range of applications. In the automotive industry, body frames were originally made of hardwood. This was replaced in 1923 when the American Rolling Company developed steel sheet production. The wooden frames were inferior in energy absorption which was a big safety issue. Steel was also much easier to form than wood and did not warp over time. As the automobile has evolved over time, there has been an increasing public awareness of the environmental impact of the car. This has forced manufacturers to produce lighter cars which are more economical. This brought about the development of thin, highly formable sheet steel. The main competitor to steel in the automotive industry is Aluminium, which offers a much better strength to weight ratio and also a better resistance to corrosion. However steel is still the most commonly used material mainly due to lower production cost. Increasing competition from aluminium is forcing the development of modern steels. Steel naturally has a higher formability and elongation than aluminium which is one of the reasons it is used so extensively in the automotive sector. This can be seen in Figure 1.1: Figure 1.1- Yield strength vs total elongation of aluminium alloys and automotive steels [3] Ultra low carbon (ULC) steels are used commonly in the production of automobiles. Their, highy formability and suitability for hot dip galvanising make them very attractive to automobile producers[4]. Pressure is being put on the manufacturers to produce lightweight cars that minimise emissions without compromising safety. Metallic properties required to achieve this consist of a high tensile strength, high r- value, good ductility and also the ability to be made resistant to corrosion (either naturally or through the use of chemical surface treatment). Various high performance steels have been developed to meet these requirements, of these, one of the most important being HSLA steels. High strength low alloy steels provide a much better strength to weight ratio than conventional low carbon steels allowing for thinner grades to be used, saving weight. HSLA steels have a manganese content of up to 1.5%, as well as microalloying elements such as vanadium and titanium. HSLA steels are increasingly replacing traditional low carbon steels for many automotive parts. This is due to their ability to reduce weight without compromising strength and dent resistance. Typical applications include door-intrusion beams, chassis members, reinforcing and mounting brackets, steering and suspension parts, bumpers, and wheels [5]. High strength low alloy steel properties are determined by the way in which they are processed. High deep drawability, can be achieved through precipitation of elements by annealing to produce a strong {111} recrystallisation texture [7], producing highly formable steels which are very desirable for automotive applications. In this study, two grades of IFHS strips are studied. A titanium only stabilised steel grade and a titanium-vanadium stabilised steel grade. These have been treated using a Viking tube furnace and studied using a scanning electron microscope, Photoshop and Optilab Software. Both steel grades have been studied using carefully selected thermo mechanical heat treatment cycles. The heating variables are expected to cause varying effects to the mechanical properties and microstructure of the two materials. The addition of vanadium in one of the steel grades is also expected to influence the mechanical properties. With the data obtained from my experiments I hope to determine the optimum processing route for similar HSLA steels. Chapter 2 Aims Carry out selective batch annealing heat treatments on two microalloyed High Strength IF strip steels. Measure grain size evolution samples using scanning electron microscopy and quantitave optical microscopy techniques. Measure mechanical properties of obtained samples using hardness and tensile testing techniques Determine the optimum processing characteristics, resulting in optimum mechanical property characteristics. Chapter 3 Literature Review 3.1 AUTOMOTIVE STEELS Automotive manufacturers make use of many different metals in the production of cars, of which the most predominant being steel. This is for several reasons, steel is relatively easy to recycle in comparison with polymers and aluminium, and this is an issue which is growing in importance as the public are becoming more and more environmentally aware. Steel is also a very good material in terms of its practicality, as it is easily welded, has good formability, elongation and ductility. As the environmental impact of cars is becoming more and more important, stringent regulations regarding emissions are being forced upon manufacturers. One of the ways that manufacturers have chosen to meet these requirements is to make the cars lighter by switching from mild steel to high strength steel grades which enables components to have a thinner cross section, saving weight. The three main types of steels used in automobiles today are; Low strength (IF and mild steels), High strength (Carbon manganese, bake hardening, IFHS and HSLA) Advanced high strength steels (dual-phase, complex phase, transformation induced plasticity and matensitic steels) These steel types can be seen below on figure 3.1 comparing their elongation and strength. Figure 3.1: Classification of automotive steels [8]. 3.1.1 Mild Steels Mild steels are normally found in two different forms for automotive purposes. Drawn Quality and Aluminium killed. These are both cheap to manufacture are used for high volume parts. They are usually of a ferrite microstructure. [8] 3.1.2 Interstitial Free Steels IF steels are used for car body panels extensively due largely to their deep drawability. The high elongation achieved in comparison with other steel grades can be seen in figure 3.1.The main characteristic of IF steel is a low carbon and nitrogen content. These elements are removed from solution by adding specific elements for alloys. Commonly used elements for this microalloying process include Manganese, Sulphur, Titanium and Niobium. As well as a deep drawability, IF steel have low yield strength but a poor dent resistance which is undesirable for certain automotive applications [6] Bake Hardening Steels BH steels keep carbon in solution either during processing before it is precipitated or during the paint baking state [8]. This strengthens the steel through solid solution strengthening, resulting in steel with both high formability and high strength. 3.1.4 Carbon-Manganese Steels Carbon-manganese steels are solid solution strengthened and are used in strip form on automobile bodies, although they are becoming replaced by lighter steel grades. They offer high drawability and are relatively cheap to produce. [9] D.T.Llewellyn: Steel: Metallurgy and Applications, Butterworth-Heinemann Ltd, Great Britain, 1992. 3.1.5 High-Strength Low-Alloy (HSLA) Steels HSLA steels are strengthened through the addition of microallying elements. These react with the carbon and nitrogen within the steel to form carbides and nitrides. Common elements include Nb, V and Ti. The resultant steel has both high strength and a high formability due to very fine grain sizes [10] Dual-Phase (DP) Steels Dual-phase steels contain two phases within their microstructure. These are ferrite and martensite. This two phase structure is produced through a complex series of contolled heating and cooling. Martensite regions are produced by heating and rapidly cooling. It is the marteniste regions tha give the hardness to the material where as the ferrite regions are much softer. The structure of DP steels takes advantages of the properties of each of the phases, where the hard maternsite regions are surrounded by softer ferrite which reduces brittleness, shown in figure 3.2. DP steel has good ductility, low yield strength but high work hardening rate [8]. Figure 3.2: Microstructure of DP steel [8]. 3.1.7 Transformation-Induced Plasticity (TRIP) Steels TRIP steels consist of a mainly ferrite microstructure with a low austenite content within the matrix. An isothermal hold during production at an intermediate temperature is used to produce bainite [8]. Strength is increased by transformationing of austenite regions to harder martensite regions. TRIP steels have a good work hardening rate and good strength. Work hardening in TRIP steels continues at higher strain levels than those of DP steels so TRIP steels is a superior material from this aspect. Figure 3.3 shows the multi phase microstructure of TRIP steel. Figure 3.3: Microstructure of TRIP steel [8]. Martensitic (MS) Steel MS steels are mainly of a martensitic microstructure but contain small amounts of ferrite and bainite. During heat treatment the steel is rapidly cooled transforming austenite into martensite. This gives a very high tensile strength since martensite produces a very hard material, but the drawback is this also gives a low formability. In order to overcome this low formability further processing such as heat treatments must be undertaken. [11] 3.1.9 High Strength Interstitial Free (HS-IF) Steels HSIF steels are strengthened through the addition of microalloying elements. Commonly used alloying elements include P, B, Si, Mn, Ti, N. The combinations in which the microalloying elements are used have an effect on the properties of resultant steel allowing a range of requirements to be met. HSIF steels can produce nearly twice the potential yield strength as conventional IF steels, although there is a reduction in formability. 3.2 Microalloying Elements 3.2.1 Carbon Carbon is one of the most important interstitial elements within steel, giving very different mechanical properties as its percentage content is altered and therefore must be studied in depth. Carbon is an element commonly found in automotive steels due to its high strength properties. Although adding carbon increases strength, it also affects the formability, i.e. its deep drawability. A set of experiments were carried out to determine the effect of carbon content within steel. When analysing the tensile test results it was noted that the ultimate tensile strength, the proof stress and the yield stress all increased as the amount of carbon increased in the steel. The plastic region as well as the general elongation of the steel under tensile stress decreased as the carbon content increased. These are significant changes in the mechanical properties. Hardness and Tensile strength increase as carbon content approaches 0.85% C as shown in figure 3.4. The elongation percentage decreases as the carbon content increases. This suggests that the more carbon present in the material, the stronger and less ductile it becomes. Figure 3.4: Affect of Carbon content in Steel Yield Strength Carbon content influences the yield strength of steel because carbon molecules fit into the interstitial crystal lattice sites of the body-centred cubic arrangement of the iron molecules. The interstitial carbons make it more difficult for any dislocation to occur as it reduces mobility. This has a hardening effect on the metal. Phase diagram Using the phase diagram one can understand why the properties of steels change with differing carbon content. Figure 3.5: Phase Diagram The gamma phase, relates to an Austenite range which has a Face Centred Cubic (FCC) structure. The alpha phase relates to a ferritic Body Centered Cubic crystal structure. Ferrite is found extensively in automotive steels, its BCC structure is much less dense than the FCC of austenite which makes it easily formable and therefore relatively cheap to manufacture. Fe3C refers to cementite and the mixture of alpha (ferrite) + cementite is called pearlite. On the phase diagram steels only apply up to about 1.4% carbon. The eutectoid point is at 723 degrees and is where there are three phases in equilibrium. The eutectoid composition is Fe-0.83%C. The reaction that happens at the eutectoid point is: austenite > ferrite + cementite gamma > alpha + Fe3C High carbon content means a greater precense of austenite, whereas low carbon content will give less austenite and a more ferritic microstructure. The affect of these differing microstructures is reflected in their mechanical properties. This is because Ferrite is soft and ductile and Cementite is hard and brittle. It can be seen by looking at figure 3.5 that as the carbon content is increased, strength increases. This relationship occurs up to the eutectoid point after which it starts to reduce. This where cementite grain-boundaries are created. The figure below shows how the varying content of carbon in steel affects its properties and suitability for different applications. Figure 3.6 Carbon Steel Applications Lever rule The lever rule can be used to calculate expected proportions of the phases present in each of the tested carbon steel specimens. These values can then be compared to the values obtained through testing. Figure 3.7 Lever Rule Calculations: a = Ferrite a + Fe3C = Pearlite 0.1wt%C Normalised Steel Tensile Specimen: % Ferrite = (0.8- 0.1)   Ã‚   = 0.897   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8-0.02) % Pearlite= (0.1- 0.02)    = 0.103   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8- 0.02) 0.4wt%C Normalised Steel Tensile Specimen: % Ferrite = (0.8- 0.4)   Ã‚   = 0.513   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8-0.02) % Pearlite= (0.4- 0.02)    = 0.487   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (0.8- 0.02) 0.8wt%C Normalised Steel Tensile Specimen: % Ferrite = (0.8- 0.8)    = 0   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   (0.8-0.02) % Pearlite= (0.8- 0.02)   = 1   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   (0.8- 0.02) These results suggest that as the carbon content increases the pearlite to ferrite ratio also increases. So the ratio of Pearlite to ferrite increases as carbon content is increased the material is made harder, stronger and more brittle but less ductile. These results obtained using the lever rule support the results obtained from the tensile test, showing the steel with the highest carbon content to be the least ductile and most brittle. The results are also supported by the findings from the hardness test which shows the steel with the highest carbon content to be the hardest. 3.2.2 Titanium The addition of Titanium to IFHS steels is particularly useful in the manufacturing of strip steels where good drawability is a requirement. The addition of Ti or Nb results in a lower Yield Strength/Tensile Strength ratio giving an increased formability. This can be seen in figure 3.8. When Titanium reacts with Carbon and Nitrogen it forms TiC and TiN, these precipitates work to delay recrystallisation of austenite, thus refining the grains to a favourable smaller size [12]. Figure 3.8: The effect of Titanium and Niobium on Yield Srength/UTS ratio [12] Titanium precipitates exist within steels and these affect the mechanical properties. TiN precipitates help to promote recrystallisation and encourage the {111} texture. TiS precipitates are commonly found in the austenite region as well as Ti4C2S2, Ti4C2S2 is formed by reacting with Carbon and in the highest regions of the austenite range there is little to no Carbon. These conditions are created at very high temperatures similar to those during hot rolling processes. This leaves the steel highly formable and suitable for deep drawability application such as car body panels. It is very difficult however to form Ti4C2S2 as it is less stable than TiS, although it can be encouraged through specific heat treatment processes. [13] 3.2.3 Vanadium Titanium is commonly added with Niobium to steels to increase formability through precipitation. However these additions can result in a retardation of recrystallisation meaning a higher temperature or longer soaking time is required for recyrstallisation to occur. Vanadium offers a replacement to Niobium in the form of carbides and nitrides, VC and VN, which does not cause such a drastic retardation of recyrstallisation. This is attractive to manufacturers as lower temperatures and shorter processing time during annealing are more cost effective. The effectiveness of Vandium in essentially lowering the recrystallisation temperature is shown in Figure 3.9. Figure 3.9: The effect of Ti + Nb, Ti + V and V stabilised steels on the Temperature for Complete Recrystallisation in 30 Seconds [44]. Figure 3.9 shows that the V only stabilised steel recrystallises at a lower temperature than the TiV and TiNb steels. 3.2.4 Sulphur Sulphur is found in all steels including Interstitial Free High Strength Steels. It acts as an interstitial elements and other elements to form precipitates such as TiS, MnS and Ti4C2S2. These precipitates have different effects on the mechanical properties of the material. In particular the precipitation of carbosulphides is beneficial to the steel as this causes the steel to form in the austenite range and helps to reduce the TiC formation which could occur during heat treatment processing and cause the material to become less likely to form the {111} texture.[13] Promoting Ti4C2S2 therefore encourages the formation of the favourable {111} texture, increasing the formability of the material. In order for Ti4C2S2 to develop, Sulphur, Carbon and Titanium must all be present, and processed in such a way as to form a reaction, which can difficult. 3.2.5 Niobium Niobium if found extensively in IFHS Steels reacting with carbon to form carbides such as NbC. Solute Niobium can be used to segregate austenite and ferrite grain boundaries and increase the strength of the austenite region [14]. As Niobium content increases the r-value decreases as well as the ductility. Generally Nb content is minimised as much as possible as the positive effect it has on strength in the austenite region is relatively small and is outweighed by the negative effect it has on ductility. Boron can be used instead of Niobium as it has a much greater effect on strength than Niobium. This can be seen in figure 3.9 Figure 3.9: Average Flow Stress vs. Temperature for B, C, and Nb and Mo solutes in steel [15]. 3.2.6 Phosphorus Phosphorus, P, is a common alloy of IFHS steel, offering increases in strength through solid solution hardening. Adding Phosphorus can also have a direct effect on the grains within a structure by increasing the Hall-Petch slope (described below). Adding P however can have a negative effect on the brittleness of the material. This can be particularly problematic during the cold working process where brittle fracture is a distinct possibility. The Hall-Petch relationship says that as the grain size decreases the yield strength of a material increases. This is due to the dislocations piling up at grain boundaries, which act as barriers to dislocation movement at low temperatures. If the grain size is large, then a high number of dislocations will pile up at the edge of the slip plane. When the stress exceeds a critical value the dislocations cross the boundary. So the larger the grain size, the lower the applied stress required to reach this critical stress at the grain boundary, meaning the larger the grain size, the lower the yield stress due to easier dislocation movement. This is true down to a grain size of 100nm. Below this size the yield strength remains constant or starts to decrease. This is effect is called the reverse Hall-Petch effect. Phosphorus along with Silicon and Manganese are added via solid solution strengthening to strengthen steel allowing for a thinner sheet of metal to be used for car body panels, and thus reducing the weight. Phosphorus is the most effective out of the three elements in terms of cost and strengthening effect. This can be seen below in figure 3.11 where the effects of P and S additions are compared. Figure 3.11: Comparison of Stress vs. Temperature between Phosphorus and Silicon microalloyed Steels [16]. Phosphorus is also found in the form of FeTiP precipitates. These precipitates have a negative affect on strength and drawability. The effects of these precipitates are greater in batch annealed steels than in continuous steels. This is due to the long soaking times required in batch annealing which provides optimum conditions and sufficient time for these precipitates to form [17]. 3.2.7 Manganese Manganese is added through solid solution strengthening to IFHS steels in a low concentration in order to react with the Sulphur to produce MnS precipitates. These MnS precipitates act to refine grain structure during processing when there is a transformation in phase between austenite and ferrite. Mn is to strengthen steels through solid solution strengthening. The effect of Mn is relatively small in the austenite range but compared to the ferrite range. This is due to a difference in Mn solubility between the austenite and ferrite ranges. Where Mn in ferrite is 10wt% higher than in austenite [18] Mn acts to stabilize the austenite region and slows down the rate of austenite transformation and also the temperature at which the transformation takes place. This lowering of transformation temperature between austenite and ferrite promotes finer grains through grain refinement. Mn can be found in oxide and sulphide forms as well as combinations of the two, oxysulphides. These oxides and sulphides act to deoxidise and desulphurise the steel. When in sulphide form, MnS helps to reduce embrittlement of steel without reducing hardness. When mixed with common impurities such as Al2O3, SiO2, MnO, CaO, CaS and FeS an increase in hardness and strength occurs [19]. When in the oxide form, MnO at the surface acts a barrier layer to prevent surface oxidisation and corrosion. 3.2.8 Silicon Silicon is a useful element and is used to increase the strength through solid solution strengthening, although there is a compromise as increasing Silicon content decreases ductility. Silicon is also found in oxide form, as silicon dioxide. Silicon dioxide is found with Manganese Oxide or as Silicomanganese to give a strong oxygen stabilisation and prevent corrosion of steel. [20]. 3.2.9 Aluminium Aluminium is used to deoxidise steel by reacting with oxygen within the steel to form Al2O3. These Aluminium Oxides are later removed leaving an oxygen free steel. However the low density of Aluminium means that oxidisation could occur at the steel interface resulting in corrosion. Aluminium content can have a negative effect on formability. This is due to the precipitation of AlN during recrystallisation preventing the {111} development and thus preventing the formation of finer grains. So minimising the amount of AlN in solid solution results in higher formability. A more stable alternative to AlN which is commonly used in IFHS steels is TiN. 3.3 Hardening and processing There are many different compositions of steel which offer various advantageous properties. The main reason for altering composition or alloying is to strengthen the material. This can be done in several ways; 3.3.1 Precipitation strengthening This process uses heat treatment to raise the yield strength of a material. As temperature changes during heat treatment processing, fine particles are produced due to differing melting points of impurities. These fine particles impede dislocation movement. This in turn reduces the ductility and plasticity of the material and increases its hardness. 3.2.2 Solid – solution strengthening Solid solution strengthening is a form of alloying. It is a commonly used technique to improve the strength of a material. Atoms of the alloying element are added to the crystal lattice of the base metal via diffusion. There are two ways in which this can occur, depending on the size of the alloying alloying element. These are via substitutional solid solution, and interstitial solid solution. Substitutional solid solution This takes place when the sizes of the alloying atoms are equal in size to the base atoms, (Differing in size by no more than 15% according to the Hume-Rothery rules) The alloying atoms replace the solvent atoms and assume their lattice positions. The solute atoms can produce a slight distortion of the crystal lattice, due to the size variation. The amount of distortion increases with the size of the solute atom. This distortion has an effect on microstructural properties. The formation of slip planes is altered making dislocation movement more difficult, meaning a higher stress is required to move the dislocations. This gives the material a higher strength. A generalisation associated with substitution is that large substitutional atoms put the structure under compressive stress, and small substitutional atoms give tensile stress. Interstitial solid solution This occurs when the alloying atoms are much smaller than the base atoms. The alloying atoms fit into spaces within the crystal lattice. This is the case with carbon in steel, where carbon is a solute in the iron solvent lattice. The carbon atoms are less than half the size of the iron atoms so an interstitial solid solution forms. 3.3.3 Processing The final properties of steel are greatly affected by the manner in which it is first made and then processed. Typical processes include steel making, casting, hot and cold rolling and annealing. Each individual process has a distinct affect on the properties of the steel. To make the steel free from interstitial elements, Ti and Nb are often added to react with interstitials after a process called vacuum degassing. Vacuum degassing is the name given to the process where a metal is melted within a vacuum and the gasses are evaporated out. Hot and cold rolling Hot rolling is the first process to take place after steel making. After steel has been cast into uniform slabs or billets it is the rolled under a high temperature to reduce its cross sectional thickness. The hot rolling process is undertaken at a temperature above that at which recrystallisation occurs. Hot rolling reduces allows recrysallisation to occur during processing (dynamic recrystallisation) and the material is left stress free due the new grain nucleation and equiaxed grains. Effect of hot working on microstructure: Hot working occurs at high temperatures, this means that there is often enough thermal energy present for recrsytallisation to occur during deformation. This is called dynamic recrystallisation and it occurs with most metals, apart from aluminium. Recrystallisation occurs during the working process and also as the metal is cooling. Dynamic recrystallisation occurs by new grains nucleating at existing grain boundaries. The amount of recyrstallisation depends on several factors. It depends on the strain rate, temperature and amount of strain on the metal. Generally, as strain within the metal increases, so does the amount of recrystallisation. Cold working is when steel is plastically deformed below its recrystallisation temperature. This process increases the yield strength due to the plastic deformation causing slight defects within the microstructure of the metal. These defects make it difficult for slip planes to move. The grain size of the metal is also reduced, making the material harder through a process called Hall petch hardening. Hall Petch hardening, also known as grain boundary strengthening, increases materials strength by altering the grain size. This is because grain boundaries act as barriers to dislocation movement. So altering the grain size, through hot and cold rolling at various temperatures and rates will have an effect on dislocation movement and yield strength. Cold working will increase the strength of the metal by making it increasingly difficult for slip to occur. However as more and more of the larger grains split to form smaller grains the ductility is greatly reduced as the material hardens. Eventually fracture would occur. To avoid this, the material is annealed. Cold working occurs at a temperature below 0.4 of the metals melting point. Some of the energy created by the process is expelled as heat but some energy is stored within the structure putting it into a high energy state. The energy is stored within the grain boundaries of the deformed crystals and within the stress fields of the dislocations created through the plastic deformation. The structure is highly stressed after cold working and would prefer to return to its former low energy state. It is howeve