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Give the factors affecting recrystallisation.
Differentiate hot working and cold working.
PART C
Answer any four questions, each carries 10 marks.
What is fatigue? Explain the different stages involved in fatigue failure.

Describe how the fatigue life of a machine element can be improved.

Explain Ductile to Brittle Transition Temperature. List the factors affecting this
phenomenon.

Define Fracture toughness.

What do you mean by ductile fracture? With the help of neat sketches, explain
the various stages of ductile fracture.

Write notes on smart materials. Give the advantages and applications of smart
materials.

Write notes on (i) piezo electric materials (ii) shape memory alloys.

Define creep and briefly explain the factors affecting creep.

Write notes on: (i) Superplasticity (11) creep resistant materials

With the help of a neat sketch explain creep test.

Give the functions of matrix phase in composites.

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