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

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

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Engineering Materials
In spheroidising process, the steel is

Heated up to the lower critical temperature and then cooled in still air
None of these
Heated slightly above the lower critical temperature and then cooled slowly to a temperature of 600°C
Heated below the lower critical temperature and then cooled slowly

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