VTU Mechanical Engineering (Semester 3)
Material Science & Metallurgy
May 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1(a) Define APF. With a neat sketch obtain an expression for density packing factor of HCP structure.
8 M
1(b) Give brief classification of crystal defects. Explain them briefly.
6 M
1(c) List the factors affecting diffusion. Explain them briefly.
6 M

2(a) Define engineering stress and strain and true stress and true strain. Establish the relationship between true strain and engineering strain.
7 M
2(b) List and explain the mechanical properties in elastic and plastic region.
7 M
2(c) Define CRSS? Obtain the expression for the same.
6 M

3(a) Explain: i) Cup and cone fracture ii) Ductile to Brittle transition.
8 M
3(b) What are the different fatigue protection methods? Explain briefly.
6 M
3(c) What is stress relaxation? Derive an expression for the same.
6 M

4(a) What is solid solution? With neat sketches explain different types of solid solution.
6 M
4(b) Explain Hume-Rothary rules and Gibbs phase rule.
6 M
4(c) Differentiate Homogeneous and Hetrogeneous nucleation. How do you compute the critical size of nucleus and activation energy for the homogeneous nucleation?
8 M

5(a) A binary alloy of composition 60%A and 40%B consists two phases namely liquid and solid at a particular temperature. The composition of solid phase is 23%B and that of liquid phase is 68%B. Estimate the amount of soild and liquid phases is the alloy.
8 M
5(b) Draw Fe - Fe3C diagram and show all phases, fields, temperature and composition. Write all invariant reactions. Also explain the solidification of steel containing 0.4%C.
12 M

6(a) Explain TTT digram (for 0.8%C steel) by supper imposing the cooling curves on it.
12 M
Differentiate between:
6(b)(i) Austempering and martempering
4 M
6(b)(ii) Annealing and Normalising
4 M

7(a) Give composition, micro structure, properties and applications of different types of cast - Irons.
12 M
7(b) Write a note on Magnesium alloys and Titanium alloys.
8 M

8(a) Define composite. Give brief classification of composites.
6 M
8(b) With neat sketch explain production of composites, by pultrusion process.
8 M
8(c) Enumerate the merits, demerits and application of composites.
6 M



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