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Posted Date: 28 Jul 2008 Posted By: S.Aruljothi Member Level: Gold
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2007 Anna University B.E Marine engineering MV 304 — MATERIAL SCIENCE AND METALLURGY Question paper
MV 304 — MATERIAL SCIENCE AND METALLURGY
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A — (10 ? 2 = 20 marks)
1. Define packing factor and coordination number of a crystal structure.
2. In the case of lead, Bragg angle is 30? for first order reflection. If the wavelength of X–rays is 1.54 Å, what is the value of interplanar distance?
3. Distinguish between hardening and annealing.
4. What is meant by elastic deformation of metals?
5. How will you prevent fatigue failure?
6. Compare between the ductility of grey cast iron and mild steel.
7. Mention the mechanical properties of tool steels and die steels.
8. Briefly explain the effect of addition of chromium in low alloy steels.
9. How will you do tempering of the material used for making springs?
10. Define spheroidizing.
PART B — (5 ? 16 = 80 marks)
11. (i) Explain the Griffith's theory of brittle fracture. (8)
(ii) Define creep. Draw the creep curve and explain its different stages. (8)
12. (a) (i) Explain the atomic arrangement in FCC crystal and obtain an expression for its packing factor. (8)
(ii) What are Miller indices? Using miller indices how will you index the crystal planes? (4)
(iii) Explain edge and screw dislocations. (4)
Or
(b) (i) Draw the iron–carbon equilibrium diagram and explain it. (8)
(ii) Explain the meaning of non–equilibrium cooling and its effects. (4)
(iii) Why do we prefer poly crystalline engineering materials rather than single crystals for making any tool or machine? (4)
13. (a) (i) Explain the critically resolved shear stress and obtain an expression for it. (8)
(ii) Explain the terms slip and twinning in deformation of metals. (4)
(iii) Give an account on fiber strengthening process. (4)
Or
(b) (i) Give an account on dislocation movement and Frank Reed source. (6)
(ii) Explain the grain boundary strengthening. (6)
(iii) Briefly explain the lattice strains produced in substitutional solid solution. (4)
14. (a) (i) List three important copper alloys along with their composition, properties and applications. (6)
(ii) Explain the classification of cast iron and the properties of cast iron. (6)
(iii) What is the effect of addition of copper, zinc on Aluminium? (4)
Or
(b) (i) Give a brief account on shape memory alloys and their properties and applications. (4)
(ii) Discuss the different types of carbon steels and their mechanical applications. (6)
(iii) Briefly discuss the effects of four different alloying elements on the properties of steel. (6)
15. (a) (i) List the different types of surface hardening processes and tabulate their relative advantages and disadvantages. (8)
(ii) Give an account on heat treatment of tool steels. (8)
Or
(b) (i) Explain the meaning of isothermal transformation diagrams. (6)
(ii) Distinguish between austempering and martempering. (6)
(iii) What are the main advantages of thermo mechanical treatment? (4)
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