Induction hardening is a form of heat treatment in which a metal part is heated by induction heating and then quenched. The quenched metal undergoes a martensitic transformation, increasing the hardness and brittleness of the part. Induction hardening is used to selectively harden areas of a part or assembly without affecting the properties of the part as a whole.
... Induction heating systems for hardening are available in a variety of different operating frequencies typically from 1 kHz to 400 kHz ...
... Induction hardening is a surface hardening technique in which the surface of the metal is heated very quickly, using a no-contact method of induction ... Crankshaft journals are a good example of an induction hardened surface ...
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