The Role of Quenching in Heat Treating

Quenching is conducted following the austenitizing of a material in order to yield a harder microstructure, such as martensite or lower bainite. Oil is by far the most common quenching medium, but there are three main considerations when deciding how quickly, and in which medium, to quench a material: the hardenability of an alloy, the cross section of the alloy, and any special properties of the alloy.

In this guide, we discuss:

• The purpose of quenching as part of the heat treating process
• Various quenching systems and quenching media employed in heat treating
• The interrupted quenching technique for special processes

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