Best answer must have all working! Answer the following questions using the figu

Question

Best answer must have all working!

Answer the following questions using the figure below which shows the iron rich portion of the Fe-C binary phase diagram:

a) On heating, what temperature does pure iron transform from -ferrite to -austenite?

b) What is the eutectoid composition in weight percent carbon?

c) What is the eutectic temperature?

d) A plain carbon steel containing 0.20wt% carbon is heated and held at 800°C. What phases are expected to be present?

e) What is the maximum solubility of carbon in -austenite at 1000°C?

f) A cast iron contains 2.0wt% carbon. At what temperature would solidification be expected to start when the melt is cooled slowly?

Explanation / Answer

a) 9120C
b) Eutectoid Composition: Pearlite (Mixture of Ferrite and cementite),
   % carbon in the composition: 0.76%
c) Eutectic Temp: 11300C
d) Ferrite+ Austenite
e) Solution: (1130-723)/(2.14-0.76)=(1130-1000)/(2.14 - X)
   Therefore, X=1.7% Ans.
f) 11800C
     

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