E C192062

Reg No.:_. Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Pages:2

THIRD SEMESTER B.TECH DEGREE EXAMINATION(R&S), DECEMBER 2019

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 2) Show in diagram the (1 1 1) planes of a cubic lattice. Calculate their interplanar (5)
distance.
b) Calculate the Bragg angle if (1 1 1) planes of a cube (a = 3.57 A) crystal are (5)
exposed to X rays (A = 1.54 A)
2 Write Notes on:
a) Slip (5)
b) Twinning (5)
3 a) Give the comparison between an edge dislocation and a screw dislocation. (5)
b) State and explain Fick’s second law (5)
4 a) Explain the common mechanisms of diffusion in solids (5)
b) What are the main factors affecting diffusion process? (5)
PART छ
Answer any three questions, each carries 10 marks.
5 9७) What useful information does a phase diagram provide? (3)
b) Ina binary system of A and ‏بط‎ liquid phase of 40% A (6% 8) is co-existing (4)
with solid phase of 80% A (20% B). For an overall composition of 45% A,
Calculate the fraction of each phase in the given binary system.
c) What is the difference between hardening power and hardenability? (3)
6 9) State and explain Gibb’s phase rule. (4)
b) What is a solid solution? With suitable examples, explain the different types of (6)
solid solutions.
7 83) _ Discuss the functions of alloying elements in steel. (8)
b) Explain why stainless steels are corrosion resistant. (2)
8 Give the advantages, disadvantages and applications of the following:
a) Flame hardening (5)
b) Induction hardening (5)

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