Engineering Materials
When low carbon steel is heated up to lower critical temperature

The average grain size is a minimum
The grain size increases very rapidly
The grain size first increases and then decreases very rapidly
There is no change in grain size

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Engineering Materials
Which of the following statement is true about brittle fracture?

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
High temperature and low strain rates favour brittle fracture
Brittle fracture is always preceded by noise
Cup and cone formation is characteristic for brittle materials

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Engineering Materials
Specify the sequence correctly

Grain growth, recrystallization, stress relief
Stress relief, grain growth, recrystallization
Grain growth, stress relief, recrystallization
Stress relief, recrystallization, grain growth

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