- Question Three 15 Marks De Plain Carbon Steel Containing 0 6 Carbon Is Heated 25 C Above The Upper Critical Tempera 1 (414.17 KiB) Viewed 51 times
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Question Three (15 marks) De Plain carbon steel, containing 0.6% carbon is heated 25 °C above the upper critical temperatu and heat treated separately as follows: a. Quenched in cold water b. Slowly cooled in the furnace c. Quenched in water and reheated at 250 °C d. Quenched in water and reheated at 600 °C *Describe the structure/morphology at room temperature which will be formed in each case wi the help of appropriate diagrams. Explain the generalized properties (physical) of each form a justify the treatment you will prefer for making cutting tools and shock resistant engineering components. a. Draw schematics to show different types of Bravis lattices in crystalline materials. Calculate the atomic packing factor (APF) of FCC and BCC crystal structure. (6 marks) 8. State the conditions for unlimited solid solubility for an alloy system. (4 marks) c. From Gibb's phase rule, explain why a triple point is an invariant point. (4 marks) d. What are point defects? Explain two types of point defects. (6 marks)