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Fe-C Diagram

Fe-C Diagram Fe-Carbon Diagram -ferrite F(1493 C) -ferriteisBCC(cubicbodycentered).L + Fe3 Cxx Austenite interstitialsolidsolutionofcarbonin (cubicfacecentered)crystalstructure,perm ittinghighsolubilityofcarbon F(1147 C).Austenitedoesnotexistbelow1333 F(727 C) + Fe3 Cxx -ferrite solidsolutionofcarbonin -iron. -ferritehasBCCcrystalstructureandlowsolu bilityofcarbon F(727 C). + Fe3 Cxx Cementite ironcarbide,intermetalliccompound, + Fe3 Cxx CARBON CONSTITUTIONAL Diagram -IIAlloys, ,startsolidificationwithformationofcryst alsof ,andat2719 F(1493 C)remainingliquidphaseand -ferriteperformperitectictransformation, , , , , ,arecalledsteels. Alloys, ,experienceeutectictransformationat(1130 C). ( ) (1130 C), ,calledledeburite. Alliron-carbonalloys(steelsandcastirons) experienceeutectoidtransformationat(727 C). (727 C),austenitetransformstopearlite(finefer rite-cementitestructure,formingasaresult ofdecompositionofausteniteatslowcoolingc onditions).

cooled down from a temperature within the g-phase region (e.g., at 800 ºC). • Initially the alloy is composed entirely of the austenitic phase having a composition of 0.83 wt% C • As the alloy is cooled, no changes will occur until the eutectoid temperature (727 ºC). • Upon crossing this temperature to point B, the austenite

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