The Basics of Induction Hardening

Induction Hardening is a form of heat treatment in which a metal part is 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.

A widely used process for the surface hardening of steel. The components are heated by means of an alternating magnetic field to a temperature within or above the transformation range followed by immediate quenching. The core of the component remains unaffected by the treatment and its physical properties are those of the bar from which it was machined, whilst the hardness of the case can be within the range 37/58 HRC. Carbon and alloy steels with a carbon content in the range 0.40/0.45% are most suitable for this process.

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ASM for books.

http://tinyurl.com/2v3yuz

Pentration(case depth) is a function of frequency and time.

Carbon. Carbon, Carbon.

Radical quench= cracks; Change in mass/section=Cracks;

do not confuse hardness for toughness.

Do the metallography; do not rely on surface hardness tests for process control; Pay attention to DI of incoming material. source consistently.

milo