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VTU Mechanical Engineering (Semester 4)
Material Science & Metallurgy
January 2013
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 atomic packing factor and calculate atomic radius and packing factor for BCC structure
8 M
1 (b) With a neat sketch, explain the line dislocation
6 M
1 (c) State and explain the Fick's second law of diffusion.
6 M

2 (a) With the help of a neat schematic conventional stress diagram for mild steel under tension,explain clearly the behaviour of the material till fracture
6 M
2 (b) Explain non-linear elastic properties when a material is subjected to static tension
6 M
2 (c) What is work hardening?Explain the reasons for the same
6 M

3 (a) Explain with neat figure ductile feature using both stress strain and stages of fracture
8 M
3 (b) What is mean by stress relaxation ?Explain with figure
6 M
3 (c) With the help of sketch,discuss the different types of stress cycles which bring about fatigue failure
6 M

4 (a) Explain with neat sketches the different stages of mechanism of solidification
8 M
4 (b) Define solid solution .Explain the substitutional and interstitial solid solution
8 M
4 (c) Explain the factor governing the formation of substitutional solid solution
4 M

5 (a) Draw and explain the Iron -Iron carbide equilibrium diagram and label all the points and field
10 M
5 (b) Construct a phase digram using the following data and label all the fields;
Melting point of Ag =961°C
Melting point of Cu =1083°C ,

Eutectic temperature =780°C
Eutectic composition =28%Cu

Max solubility of Cu in Ag=9% at 780°C
Max. solubility of c in Ag =2%at 0°C

Max. solubility of Cu in Ag =9% at 780°c
Max. solubility of Cu in Ag =0% at 0°C.
Determine the following ;
solidification start and end solid temperature for 30% Ag alloy.
Temperature at which a 15% Cu alloy has 50% liquid phase and 50% solid phase
Percentage composition of liquid and solid phase 20% Ag alloy at 900°C
10 M

6 (a) Draw the TTT digram of Austenite for eutectoid steel. Explain the various transmission product of Austenite
8 M
6 (b) Discuss the process temperature range range, microstructure of products and application of stress relief annealing
6 M
6 (c) Explain with neat sketch induction hardening process
6 M

7 (a) Give the composition,structure and their application of
S.G iron
Malleable Iron
Gray cast Iron
8 M
7 (b) Name at least four important copper base alloys.Give Composition microstructure and their application
8 M
7 (c) Write a note on AL-Si alloys
4 M

8 (a) Explain the term composite material with example.State their advantages limitation of composites in practice
8 M
8 (b) Using neat sketch ,explain the process of preparation of metal matrix composite using melting and casting method
8 M
8 (c) What are FRPs?Give at least four example
4 M

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