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Posted By: Vellamji Member Level: Gold Posted Date: 24 May 2008
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2007 Anna University B.Tech Metallurgy & Material Technology Metallurgical Engineering Question paper
B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2003.
Third Semester
Metallurgical Engineering
MY 231 — ELEMENTS OF PHYSICAL METALLURGY
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A — (10 ? 2 = 20 marks)
1. What are the characteristics of covalent bonds?
2. Write the Miller indices of the most close packed plane in FCC.
3. How does the concentration of vacancy vary with temperature?
4. List the different point defects in crystals.
5. Write Fick's first law of diffusion.
6. What is diffusion bonding?
7. State Gibb's phase rule.
8. Write down the reaction equation in the cast iron portion of iron–carbon diagram.
9. Give the heat treatment schedule for annealing 0.4% C steel.
10. What do you mean by recrystallisation?
PART B — (5 ? 16 = 80 marks)
11. (i) Draw the unit cells of BCC, FCC and HCP crystals and compare the packing efficiency in them. (12)
(ii) Explain allotropic transformations with examples. (4)
12. (a) Discuss the different types of crystal defects with regard to their geometry, characteristics and effects.
Or
(b) (i) Discuss the concept of activation energy and its significance. (8)
(ii) Define the term ASTM grain size number and explain its use. (8)
13. (a) (i) Explain the Laws of diffusion and its significance. (8)
(ii) What are the mechanisms of diffusion? Discuss in brief. (8)
Or
(b) (i) Discuss Kirkendall effect. (8)
(ii) What are the practical applications of diffusion? (8)
14. (a) (i) Discuss the ingot structure of a solidified metal. (8)
(ii) Distinguish between eutectic and eutectoid reactions using suitable examples. (8)
Or
(b) (i) Draw the iron–carbon diagram and label the phases. (10)
(ii) For an alloy of Fe–0.4% C draw the cooling curve and estimate the amount of pearlite in the final microstructure. (6)
15. (a) (i) Discuss the concept of strain hardening. (8)
(ii) Compare and contrast between hot and cold working. (8)
Or
(b) Describe what happens during annealing of a strain hardened metal stage by stage. (16)
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