Engineering Materials
In spheroidising process, the steel is

None of these
Heated up to the lower critical temperature and then cooled in still air
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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Engineering Materials
Stress relaxation is the phenomenon

In which stress remains constant on increasing load
In which deformation tends to loosen the joint and produces a stress reduced
Stress reduces on increasing load
In which parts are not loaded

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