What is quenching?

The quenching of steel is a heat treatment process in which the steel is heated to a certain temperature above the critical temperature AC3 (hypoeutectoid steel) or AC1 (hypereutectoid steel) and kept for a period of time to make all or part of the austenite become austenite, and then rapidly cooled to below MS (or isothermal near MS) at a cooling rate higher than the critical cooling rate for martensite (or bainite) transformation. Generally, the solution treatment or heat treatment process with rapid cooling process of aluminum alloy, copper alloy, titanium alloy, tempered glass and other materials is also called quenching.

Quenching purpose

The purpose of quenching is to transform the undercooled austenite into martensite or bainite to obtain martensite or lower bainite structure, and then temper at different temperatures to greatly improve the strength, hardness, wear resistance, fatigue strength and toughness of the steel, so as to meet the different requirements of various mechanical parts and tools. It can also meet the special physical and chemical properties such as ferromagnetism and corrosion resistance of some special steels by quenching.

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