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Posted By: Sree.... Member Level: Diamond Posted Date: 14 Mar 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech METALLURGY AND MATERIAL SCIENCE(RR) Set No. 3 Question paper
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Code No: RR220302 Set No. 3
II B.Tech II Semester Supplimentary Examinations, Apr/May 2007
METALLURGY AND MATERIAL SCIENCE
( Common to Mechanical Engineering, Mechatronics, Production
Engineering and Automobile Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain with neat sketches the following: [8]
i) Edge dislocation
ii) Screw dislocation.
(b) Discuss various types of binding forces that exist in crystalline structures. [8]
2. (a) What is allotrophy? Explain with suitable examples? [6]
(b) Distinguish between crystal structure microstructure and macrostructure give
examples. [10]
3. (a) What is pearlite? Why pearlite is called a micro constituent but not phase?
[4]
(b) Lead Melts at 3200C and Tin melts at 2300C. They form an eutectic contain-
ing 62% tin at 1800C. The maximum solid solubility of Tin in lead at this
temperature is 19% of lead in tin is 3%. Assume the solubility of each at room
temperature is 1%.
i. Draw the phase diagram on a graph paper & label the points, lines and
areas in it.
ii. Describe the solidification of 40% tin alloy. Sketch the microstructure at
room temperature, giving the chemical composition and relative amounts
of the phases present.
iii. Draw the cooling curve for the above alloy. [12]
4. (a) Explain why is Malleable Iron made from hypo eutectic cast Iron. [4x4=16]
(b) Is it possible to make modular Iron by heat treatment? Explain.
(c) Why should the sulphur content be low in the manufacture of nodular Iron?
(d) In the manufacture of Nodular Iron why are inoculants added only just before
casting.
5. (a) What are the advantages of specifying steel on the basis of hardenability. [4]
(b) Explain any 2 different methods of obtaining a spherodized cementite struc-
ture. [6]
(c) What are the principle advantages of Austempering compared with the con-
ventional quench and temper method. [6]
6. Discuss the follows; giving composition microstructure, properties and applications,
[4x4=16]
1 of 2
Code No: RR220302 Set No. 3
(a) Gunmetal
(b) Manganese Bronze
(c) Duralumin
(d) Muntz metal
7. (a) What is powder Metallurgy? [4]
(b) When is powder metallurgy preferred over conventional methods. [6]
(c) What are the advantages and limitations of power metallurgy. [6]
8. (a) What is delamination? Explain how delamination at the fiber-matrix interface
can enhance the fracture toughness of composites. [8]
(b) Explain why carbon-reinforced polymer composites find wider applications in
aircraft and sports equipment than in automobiles. [8]
? ? ? ? ?
2 of 2
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