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Posted Date: 04 Sep 2008 Posted By: Sunil Reddy Member Level: Platinum
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2006 Jawaharlal Nehru Technological University Metallurgy & Material Technology III B.Tech I Semester Regular Examinations, November 2006 HEAT TREATMENT TECHNOLOGY Question paper
Code No: RR311803 Set No. 3
III B.Tech I Semester Regular Examinations, November 2006
HEAT TREATMENT TECHNOLOGY
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What is the effect of carbon contentent on tetragonality and hardness of
martensite. [8]
(b) Discuss the mechanism of Martensitic transformation. [8]
2. What is meant by temper brittleness? Why does it occur? Are there any remedies
for it? Discuss? [16]
3. With the help of a suitable diagram, explain the principle, process and applications
of marstraining and cryo forming? [16]
4. (a) Give the microstructures, properties and applications of plain carbon steels.
[10]
(b) What are the limitations of plain carbon steels. [6]
5. How are cast Irons classified on the basis of their manufacture, composition mi-
crostructure and appearance of fracture? Explain them. [16]
6. (a) Explain the microstructure of malleable cast iron and explain its importance?
[8]
(b) What are the properties of malleable cast irons? [4]
(c) What are the applications of malleable cast irons? [4]
7. (a) Draw copper-tin phase diagram and label the phases in it. [8]
(b) Write short notes on [4+4]
i. Phosphor bronze
ii. Gun metal
8. (a) Write short notes on [4+4]
i. Babbits
ii. Pb-Sn alloys.
(b) How tin base alloys are classified. Give the composition; properties and ap-
plications of any two types of tin base alloys.
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