Reg No.:

E7259

Total Pages: 1

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017

Course Code: ME210

Course Name: METALLURGY AND MATERIALS ENGINEERING (MA,ME,MP)

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

directions | 1 1 1], [ 10 1|

0) Calculate the radius of iridium atom, having FCC crystal structure, a density of (5)

22.4 gm/cc and atomic weight of 192.2 gm/mol.
a) What is a slip system? Describe the slip systems in FCC, BCC and HCP metals (6) b)
What is the minimum cation to anion radius ratio for a coordination number of 8 (4) is
0.732?
a) Differentiate between edge dislocation and screw dislocation with neat sketches
(6) b) Explain vacancy diffusion and interstitial diffusion with neat sketches.
(4)
a) Describe working of SEM with a neat sketch. (8) b) Define grain size number.
(2)
PART B
Answer any three full questions, each carries 10marks.
Describe the changes in microstructure with suitable sketch, when cooled slowly (10) from
austenite to room temperature for
i) Hypo eutectoid plain carbon steelsii) Eutectoid plain carbon steels iii) Hyper eutectoid
plain carbon steels
What is hardenability? Describe hardenability test. What are the factors affecting
(10) hardenability?
Give the microstructure, composition, properties and applications of i) Gray Cast
(10) Iron ii) Malleable cast iron.
Explain thestages of age hardening of aluminium alloys. (10)
PARTC
Answer any four full questions, each carries 10marks.
a) Distinguish between ductile and brittle fracture. (4) b) What is ductile to brittle transition
in steel DBTT? What are the factors affecting (6) ductile to brittle transition?
Explain the process of crack initiation and crack propagation in fatigue. (10)
a) Explain how fatigue limit of a ferrous material is determined. (6) b) Explain notch
sensitivity index in fatigue. (4)
Write short note on (10)
i) Shape memory alloys ii) Super alloys.
a) Define creep. Explain different stages of creep. (6) 0) What 15 superplasticity?
(4)
a) List two applications of composites. Differentiate between particle reinforced (6) and
fibre reinforced composites

b) What is composite biomaterial? Give example. (4)