Microstructure in iron carbon alloys eutecticpearlite hypoeutectoid alloys hypoeutectoid steel. Discuss the iron carbon diagram and various allotropies of. View and download powerpoint presentations on iron carbon equilibrium diagram ppt. The iron iron carbide diagram a map of the temperature at which different phase changes occur on very slow heating and cooling in relation to carbon, is called iron carbon diagram. Nptel noc phase equilibria in materials nature and properties of ii mechanical engineering iron carbon equilibrium diagram metallurgy carbide phase example 1 22 because phase diagrams 1 binary eutectics. The fec phase diagram is a fairly complex one, but we will only consider the steel part of the diagram, up to around 7% carbon. If a solid solution alloy is viewed under a microscope only one type of crystal can be seen just like a pure metal. The main structures, significance of various lines and critical.
It should first be pointed out that the normal equilibrium diagram really represents the metastable equilibrium between iron and iron carbide cementite. Trick to remember iron carbide diagram for any exam. The part of iron carbon alloy system diagram between pure iron and an interstitial compound, iron carbide fe 3 c, containing 6. You name and describe the different phases of pure iron during the cooling process. Unit quiz the ironcarbon system multiple choice identify the choice that best completes the statement or answers the question. Classification, properties and uses of carbon steels, cast iron and alloy wheels. A simplified version of the iron carbon equilibrium diagram is shown below. Introduction to ironcarbon equilibrium diagram structures in fec diagram ironcarbon equilibrium diagram fig. Iron cementite diagram is not a true equilibrium diagram, since equilibrium means no change of phase with time, however long it may be. Mechanical engineering best website for mechanical engineers with complete. This lecture discusses the ironcarbon phase diagram with different phases and reactions involved. Equilibrium phase fractions can also be estimated from a knowledge of the carbon concentration of the steel and an application of the lever rule. The proposed new version of the complete equilibrium phase diagram of the iron carbon system enables to reject the superposed version of the equilibrium and non equilibrium phase diagram of iron carbon and explains clearly the presence in the microstructure of iron carbon alloys at the room temperature of. Cementite is a metastable phase, which decomposes to graphite if given long periods of time.
Find powerpoint presentations and slides using the power of, find free presentations research about iron carbon equilibrium diagram ppt. You distinguish between metastable and stable iron carbon. Cooling curves showed that the formation of cementite was always associated with a lower eutectic temperature as compared to the formation of graphite that took place at temperatures about 10 0 c higher. A new version of the complete equilibrium phase diagram of the iron carbon system has been proposed, which enables to reject the conventional superposed version of the equilibrium and non. It may be noted that though it is called as equilibrium diagram, it is not a true equilibrium diagram, since equilibrium implies no change. Iron carbon diagram is also known as iron carbon phase diagram or iron carbon equilibrium diagram or iron iron carbide diagram or fefe3c diagram. A map of the temperature at which different phase changes occur on very slow heating and cooling in relation to carbon, is called iron carbon diagram. Material science, the iron carbon phase diagram, part 1 youtube. How to make iron carbon equilibrium diagram easily in just few. The dashed lines show iron graphite equilibrium phase stability, which requires extremely long times to attain at. This is due to the fact that maximum solubity of carbon in iron is 6. Discuss the iron carbon diagram and various allotropies of steel. To explain the various structures that can occur in cast iron, the iron carbon double diagram was introduced as far back as 1904 1.
Iron carbon phase diagram in their simplest form, steels are alloys of iron fe and carbon c. Iron carbon equilibrium diagram complete discussion with interview questions. Phase diagrams 5 a system is at equilibrium if at constant temperature, pressure and composition the system is stable, not changing with time. The metastable fec phase diagram was calculated with thermocalc, coupled with pbin thermodynamic database. In their simplest form, steels are alloys of iron fe and carbon c, so we will be looking at phase transformations using the fec phase diagram.
The phase diagram illustrates the domains in which particular phases or combinations of phases are stable, and contains information about their equilibrium compositions. Control of material properties, mechanical properties and recrystallization. Martensite non equilibrium bct phase from quench of. Ironcarbon equilibrium diagram poster hobart institute of.
Iron carbide equilibrium diagram material science engineers academy hello everyone welcome to aim amie in this videos we have. At 900oc, above the upper critical temperature, the carbon is dissolved in a solid solution called austenite. In the following iron carbon phase diagram, we can see that the maximum concentration of carbon is 6. The compositions of the two new phases are given by the ends of the tieline through the eutectoid point. Therefore, it is also called as iron iron carbide equilibrium diagram. This sceencast is part four of our series about phase diagrams. To download the slide set from this video, visit this site. An equilibrium phase or constitutional diagram is a graphic representation of the effects of temperature and. The study of the constitution and structure of iron and steel start with the iron carbon phase diagram. The percentage of carbon present and the temperature define the phase of the iron carbon alloy and therefore its physical characteristics and mechanical properties. Having trouble understanding the ironcarbon phase diagram. Equilibrium crystallisation of iron carbon alloys metallography lecture 8.
Iron carbon equilibrium diagram as used in engineering materials by mechanical engineers. Iron carbon diagram free download as powerpoint presentation. Heat treatment of steels an overview sciencedirect topics. It is also the basic understanding of the heat treatment of steels. The ironiron carbide diagram a map of the temperature at which different phase changes occur on very slow heating and cooling in relation to carbon, is called iron carbon diagram. This chapter discusses iron carbon equilibrium diagram. At the lowcarbon end of the metastable fec phase diagram, we distinguish ferrite alphairon, which can at most dissolve 0. Iron carbon phase diagram in brief engineering insider. The iron carbon system steel and cast iron mse 2090. Part 1 the iron carbon equilibrium phase diagram single phases in the equilibrium diagram.
Iron carbon diagram shows the type of alloys formed under very slow cooling, proper heattreatment temperature and how the properties of steels and cast irons. The percentage of carbon determines the type of the ferrous alloy. Ironcarbon equilibrium diagram mechanical engineering. Chapter 4 equilibrium phase diagrams and the ironcarbon system. Teach yourself phase diagrams university of cambridge. The ironcarbon diagram there are two iron carbon equilibrium diagrams. Dec 20, 2017 iron carbide equilibrium diagram material science engineers academy hello everyone welcome to aim amie in this videos we have covered the iron carbon equilibrium diagram along with the. As slow cooling takes place to below the lower critical temperature of. Ironcarbon equilibrium diagram as used in engineering materials by mechanical engineers. A vertical section isopleth of the tungstenironcarbon phase diagram see figure 1 is often used to show what happens if cobalt in the tungstencobaltcarbon ternary system the basis for cobaltbonded wc tools is completely substituted by iron. The iron iron carbide fefe3c phase diagram in their simplest form, steels are alloys of iron fe and carbon c. Material science, the iron carbon phase diagram, part 1 duration.
Is a lamella microstructure formed under the eutectoid point in a carbon and iron phase diagram. The ironcarbon equilibrium diagram and plain carbon steels. Nov 08, 2015 the ironiron carbide diagram a map of the temperature at which different phase changes occur on very slow heating and cooling in relation to carbon, is called iron carbon diagram. It is very soft and ductile and is known as alpha iron by the metallurgists. Sketch and explain the iron carbon equilibrium diagram. Logicalvideosdotorg iron carbon equilibrium diagram iron carbon equilibrium diagram iron carbon diagram iron carbon equilibrium diagr. The three phases, ferrite, cementite and pearlite are the principal constituents of the microstructure of plain carbon steels if they have.
Product information shipping information view shipping rates and policies. The phase diagrams are completely valid only under conditions of thermal equilibrium. The ironiron carbide phase diagram heat treatment of steel features microstructures steels microstructural changes in steel on cooling for different compositions. Bcc orthorhombic iron carbon phase diagram iron shows a eutectic with carbon allowing for a lower melting alloy body centered tetragonal. The iron carbon diagram provides a valuable foundation on which to build knowledge of both plain carbon and alloy steels in their immense variety. To download ppt version and more useful ebooks please click on the link below. Instead of dealing with several different cooling curves for any alloy a quicker graph has been created using the various arrest points of all the alloys. The iron carbon diagram there are two iron carbon equilibrium diagrams. Ferrite is present to some extent in a great range of steels, particularly. Iron carbon diagram leaving certificate engineering notes. Solid solution alloys a solid solution occurs when we alloy two metals and they are completely soluble in each other. In the equilibrium phase diagram of ironcarbon system, assume we have a eutectoid steel with carbon weight ratio of 0.
The pearlite steel is a mixture of ferrite and cementite. Please provide detailed solutions, steps and explanations. This has a facecentre cubic fcc structure above 910oc. The phase diagram shows two phases, ferrite iron, and iron.
The ironcarbon double diagram, a fundamentally wrong concept. A study of the constitution and structure of all steels and irons must first start with the ironcarbon equilibrium diagram. Thus, since the equilibrium phase diagrams are used to identify the phases and. Iron carbon diagram hindigate 2019 mechanical engg. Iron carbon phase equilibrium diagram mcq questions and answers in hindi part 1. Iron carbon equilibrium phase diagram by manufacturing process technology part i. Phase diagrams in materials science and engineering. Iron carbon diagram shows the type of alloys formed under very slow cooling, proper heattreatment temperature and how the properties of steels and cast irons can. According to the diagram, point b is which of the following. Ironcarbon equilibrium diagram poster hobart institute. This is a fairly complex phase diagram but we are only interested in the steels part of the diagram up to around 7% carbon. A phase is a portion of a substance possessing a welldefined structure, uniform composition, and distinct boundaries or interfaces. Engineering materials ironiron carbide phase diagram.
For the use of this term in mathematics and physics, see phase space a phase diagram in physical chemistry, engineering, mineralogy, and materials science is a type of chart used to show conditions pressure, temperature, volume, etc. Iron carbon diagram iron iron carbide phase diagram iron iron carbide phase diagram features of iron iron carbide diagram phases present. Ghosh,department of metallurgy and material science,iit kharagpur. What is ferrite, cementite, pearlite, martensite, austenite. This video introduces major features of the fefe3c phase diagram, steel classification, and basics applications for steels. Having trouble understanding the iron carbon phase diagram. The metal iron is a primary constituent of some of the most important engineering alloys and hence it is important to study the ironcarbon diagram.
Introduction to iron carbon equilibrium diagram structures in fec diagram. Fe3c iron carbide called cementite because it is hard. Its best way to draw and remember iron carbon equilibrium diagram in heat treatment chapter. Phase diagrams tungstenironcarbon w fec phase diagram. Iron carbon diagram shows the type of alloys formed under very slow cooling, proper heattreatment temperature and how the properties of steels. If an element enters into solid solution in iron forming in that way a binary alloy each of these transformations are required by the phase rule to occur over a range of temperature. A mathematical expression whereby the relative phase amounts in a twophase alloy at equilibrium may be computed liquidus line. Or draw a neat sketch of iron carbon equilibrium diagram and explain the following reactions i eutectic reaction ii eutectoid reaction iii peritectic reaction. Ironcarbon phase diagram iron shows a eutectic with. Easy draw iron iron carbide equilibrium diagram duration. The iron carbon equilibrium phase diagram 10 presented in figure 1 shows carbon levels up to 7 wt. In a glass of soda with ice, the soda is continuous and the ice is discontinuous. Iron which contains little or no carbon is called ferrite. When these points are marked on a graph and joined up we get a thermal equilibrium diagram.
Analysis of stable iron carbon and metastable iron ironcarbide ohase diagrams. The ironcarbon equilibrium diagram total materia article. L liquid phase a ferrite bcc structure ferromagnetic. A free powerpoint ppt presentation displayed as a flash slide show on id. Iron carbon phase diagrams free download as powerpoint presentation. The iron iron carbide fefe 3c phase diagram ferrite. In their simplest form, steels are alloys of iron fe and carbon c.
685 99 1160 663 521 357 322 288 71 422 585 1576 1602 125 1362 759 1228 162 1350 486 564 316 844 170 63 671 327 651 1151 982 768 1435 242 790 1012 37 14 1021 772 592 82