Iron Iron-carbide Equilibrium Phase Dia Gram

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Iron Iron-carbide Equilibrium Phase Dia Gram

  1. 1. Iron Iron – carbide equilibriumdiagram
  2. 2. Muhammad Zubair MME12-29Gulfam Hussain MME12-30Presented By
  3. 3. Phase A physical homogeneous distinct of a material system iscalled phase.Equilibrium State The state at which any phase reactioninitiate and goes to complete.Phase Diagram The graphical representation of temperatureand composition of an alloy system.Liquids A liquids is a line above which the substance is stablein a liquid state.Introduction
  4. 4. Phase Diagram
  5. 5. The diagram represent three horizontal linesPeritectic The horizontal line at 1479oC is called Peritecticline.Eutectic The horizontal line at 1140oC is called Eutectic.Eutectoid The horizontal line at 723oC is called Eutectoid.Horizontal Lines
  6. 6. Peritectic reaction is that reaction in which 1 liquidand 1 solid convert into 1 new solid and makeaustenite the maximum solubility of carbon in deltairon is 0.10% and structure is B.C.CLiquid + ↔ austenitePeritectic Reaction
  7. 7. Eutectic reaction is that reaction in which 1 liquidconvert into two new solid and make austenite andcementite This occurs at 1140oC for steel when 4.3%carbon is contained in the alloy.liquid ↔ austenite + cementiteEutectic Reaction
  8. 8. Eutectoid reaction is that reaction in which 1 solidconvert into two new solids the temperature is 723oCaustenite ↔ pearlite (mixture of ferrite & cementite)Eutectoid Reaction
  9. 9. Austenite- (γ) gamma-iron: interstitial solid solution ofcarbon (up to 2 wt%) dissolved in iron with a (F.C.C)structure. Stable up to 1394 °C.Austenite
  10. 10. Ferrite - (α ) alpha -iron, which is an interstitial solidsolution of a small amount (up to 0.022wt%) of carbondissolved in iron with a B.C.C crystal structure.It is the soft structure on the iron-iron carbidediagram. Magnetic below 768°C.Ferrite
  11. 11. Cementite - iron carbide: chemical formula, Fe3C,contains 6.67 % wt. C.It is a typical hard and brittle interstitial compound oflow tensile but high compressive strength.Its crystal structure is orthorhombic.Metastable phase: at~700 °C slowly (several years)decomposes to α-iron and carbon.Cementite
  12. 12. Pearlite (α + Fe3C): eutectoid mixture containing 0.76%wt. C and is formed at 727 °C under slow cooling.It is very fine plate-like or lamellar mixture of ferrite(0.022 wt. % C) and cementite (6.7 wt. % C).The structure of pearlite includes a white matrix(ferrite background) which includes thin plates ofcementite.Pearlite

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