Tempand concert ) t write the reaction ?a) Define the three p ase reactions onth

Question

Tempand concert ) t write the reaction ?a) Define the three p ase reactions onthisdiagram C e, b) Consider a Fe 0.35% C alloy that is cooledfrom a si nite single phase region, 900 c) Howmuchofferite formsat400 °C for Fe-0.35% C all? d) How much of pearitte forms at 400 oC for Fe-035% C alloy? ew At what temperature austenite first bs ye) The microstructure of a steel consists of cementite and 92% pearlite, what is its carbon Austentte iron 72? 200 ? It's begins?transpyrioo 9 &20 6.7e-o.35 1500 2PC 022 a 95 (Fe) 35 6.70 Composition ent% C) o.?-o.azz 44.44 /

Explanation / Answer

Part e)

Pearlite = 6.7 - x/6.7-0.76

6.7 - Carbon Percentage for Cementite

0.76 - Carbon percentage at which the Pearlite start fomring . Pearlite = Ferrite+ Cementite

x= Carbron percentage to be determined

0.92 = 6.7 -x / 6.7-0.76

0.92*5.94 = 6.7-x

5.4648 = 6.7-x

x =6.7-5.4648

x=1.2352 %C Hyper Cutectoid Steel

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