VTU Material Science & Metallurgy - January 2014 Exam Question Paper

VTU Mechanical Engineering (Semester 4)
Material Science & Metallurgy
January 2014

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) Sketch the unit cell of a HCP crystal structure. Calculate the number of atoms per unit cell.Derive an expression for the density of atomic packing.(Given C=1.6339

8 M

1 (b) Explain different types of mechanics of diffusion in solids

8 M

1 (c) Aluminium has a FCC structure and an atomic radius of 0.143mm.Calculate volume of its unit cell in cubic meters

4 M

2 (a) Define engineering stress and strain true stress strain.find out the relationship between true and engineering strain

8 M

2 (b) A steel rod of 10mm diameter and1.5 mm length is subjected to an axial tensile load of 1kN. Determine stress
Strain
strain
Elongation. Take modules of elasticity of steel=205×10⁶kN/m²

6 M

2 (c) Differentiate between slip and twinning deformation in materials

6 M

3 (a) Define creep with a typical creep curves .Explain different stages of creep

6 M

3 (b) Sketches the basis modes of fracture .list the difference between them

6 M

3 (c) What is fatigue?Draw the SN curves for steel and aluminium alloys

8 M

4 (a) Explain the homogeneous nucleation. Discuss the significance of critical radius of the nuclei

8 M

4 (b) Define solid solution .and explain the different type of solid solution

6 M

4 (c) State the Gibb's phase rule and explain with a simple example

6 M

5 (a) Draw the Iron-carbon equilibrium diagram and label all the field.Write the different invariation reaction

10 M

5 (b) Explain the step to construct TTT digram Draw a sketch of a TTT diagram label all the fields for an eutectoid steel

10 M

6 (a) Define the process of heat treatment and classify the various heat treatment processes

8 M

6 (b) Explain carburizing with a neat sketch

6 M

6 (c) Define hardenability of a material and list the factors affecting hardenability.

6 M

7 (a) Briefly describe the composition, properties and application of medium and high carbon steel .

8 M

7 (b) Briefly describe the composition, properties and application of grey cast iron

6 M

7 (c) Discuss AIST-SAE designation of steel with example

6 M

8 (a) What is a composite material ?how is it classified ?Explain briefly

10 M

8 (b) With a neat sketch,explain the hand lay up laminating process

10 M

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