Thapar University 2006 M.E Engineering Materials - Question Paper
Thapar Institute of Engineering & Technology
M.E. Material Science& Engineering (1st Year)
Final Term exam
MS104 (Engineering Materials)
THAPAR INSTITUTE OF ENGINEERING & TECHNOLOGY: PATIALA
(DEEMED UNIVERSITY)
Examination: End Semester (I51 Semester) Total Marks: 45
Course: M. Tech. (Materials Science and Engineering) Time: 3 Hrs
Subject: ENGINEERING MATERIALS (MS-104)
Note: All questions are compulsory. Neatness in writing and clearness in diagrams will be accounted. The answers should he according to question. Extra and unwanted information in answers will not be entertained and marks will he deducted.
Q. 1 - State whether the following statements are true or false. Explain and justify your answer.
a) Hyper cutectoid steels arc subjected to partial annealing.
b) Alloying elements always degrades corrosion resistance properties.
c) TTT diagrams arc independent of phase diagrams.
d) Huge ingots after casting arc subjected to normalizing treatment.
e) Pearlite can be called composite.
(5x3= 15)
Q. 2 - a) What are the limitations on the use of Iron-Carbide phase diagram?
b) Why Iron-Carbide diagram is not been used to determine the structure in gray cast iron?
c) What is the role of modifier in SG Iron? How the properties SG Iron differ from that of while cast Iron?
d) Why high carbon steel is not used for case carburizing treatment?
c) How austcnitic and fcrritic stabilizers, stabilizes these phase in room temperature?
(2+2+2+2 = 8)
Q. 3 - a) What arc primary auslenitc? I low homogeneity of carbon can be obtain in austenite after pearlite to austcnite transformation?
b) Why carbides in lower bainitic structure arc not parallel to fcrritic needle?
c) Why isothermal annealing is done in the case of hypo-eutectoid steels?
d) Why steel gels hardened due to rapid cooling?
(2+2+2+2 = 8)
Q. 4 - a) What is the practical applicability of hardenability conccpt?
b) Why maraging steel arc not subjcctcd to qucnching treatment?
c) Which alloy steel is not generally subjected to welding operation and why?
d) What is the advantage of martcmpcring over conventional martcnsitic transformation?
(I+2+2+2 - 7)
Q. 5 - a) Why tin and antimony is added to yellow a-brasses? Why red brass has better corrosion resistance than yellow brass?
b) Why Al-Si-Mg alloys arc more preferred than Al-Cu alloys? What arc the limitations of Al-Mg alloys?
c) Why nickel alloys arc used in electrical and industrial furnaces? Give an application of lead-tin alloy.
(2+3+2 = 7)
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