Engineering Materials
Induction hardening is the process of

Increasing hardness throughout
Heating and cooling rapidly
Hardening surface of work-piece to obtain hard and wear resistant surface
Inducing hardness by continuous process

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Engineering Materials
The temperature required for full annealing in hypereutectoid steel is

30° C to 50° C above lower critical temperature
30° C to 50° C below lower critical temperature
30° C to 50° C below upper critical temperature
30° C to 50° C above upper critical temperature

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