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Engineering Materials - Interview Questions and Answers

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171. Process of austempering results in
A. formation of bainite structure
B. carburised structure
C. martenistic structure
D. lamellar layers of carbide distributed throughout the structure
E. relieving of stresses throughout a com-ponent.
Explanation:
172. Sulphur in steel
A. acts as deoxidiser
B. reduces the grain size
C. decreases tensile strength and hard-ness
D. lowers the toughness and transverse ductility
E. increases hardness.
Explanation:
173. The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is
A. 770�C
B. 910�C
C. 1050�C
D. below recrystallization temperature
E. above recrystallization temperature.
Explanation:
174. Hardness of lower bainite (tempered martensite) is about
A. RC 65
B. RC 48
C. RC 57
D. RC 80
E. RC 32.
Explanation:
175. An example of amorphous material is
A. zinc
B. lead
C. silver
D. glass
E. brass.
Explanation:
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