: 00000ME210121902 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Third semester B.Tech degree examinations (S) September 2020

Course Code: ME210
Course Name: METALLURGY AND MATERIALS ENGINEERING

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three questions, each carries 10 marks. Marks
1 ஐ Sketch within a cubic unit cell the following planes (1 1 1), (12 1), (0 0 1) and (5)

directions [11 1], [110]
b) Anatom having FCC crystal structure has a density of 22.4 gm/cc and atomic (5)
weight of 192.2 gm/mol. Calculate its atomic radius.
2 a) Explain the mechanism of crystallization in pure metals. What factors favour (6)

fine grain size?

b) Distinguish between a unit cell and a grain. (4)
3 ஐ Differentiate between edge dislocation and screw dislocation. (5)
b) Explain any two diffusion mechanism with neat sketches. (5)
4 9) Define grain size number. (2)

b) Describe the procedure for metallographic specimen preparation? Name any (8)
two etchants.
PART छ
Answer any three questions, each carries 10 marks.
5 9७) Justify the need of Heat treatment processes for metals. Explain with neat sketch (8)

TTT diagram for heat treatment of steel.
b) What is critical cooling rate? (2)
6 9) Draw the iron carbon equilibrium diagram, label it and show the invariant (7)
points.
b) Write the reactions occurring at the invariant points indicating the temperature (3)

and composition of each phase.

7 Give the microstructure, composition, properties and applications of the
following:
a) Nodular Cast Iron (5)
b) Grey cast iron. (5)

Page 1 of 2