Diagram of iron-carbon to be used:

(a) FCC is a more close packed structure yet solubility of carbon in austenite, which is FCC is, higher than that in ferrite, which is BCC. Why is it so? (2 marks) (b) Consider 10kg of austenite containing 0.65wt%C cooled slowly. Use the simplified the Iron-Carbon phase diagram given class to answer the following: (i) What is the pro-eutectoid phase, and what is its mass at the eutectoid temperature? (3 marks) (ii) How many kg each of pearlite and the pro-eutectoid phase form just below the eutectoid temperature (4 marks) (iii) How many kg each of ferrite and cementite form at room temperature? (4 marks) (iv) What is the mass of the pearlite at room temperature? If the answer is different from (ii), why? (4 marks) (v) Calculate the fraction of ferrite in pearlite at room temperature