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Quenching is a heat treatment process. The quenching of steel is the heat treatment process of heating steel to the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel) above the temperature, holding heat for a period of time, making it fully or partially austenitic, and then cooling at a cooling rate greater than the critical cooling rate to the martensite (or bainite) transformation below Ms (or isothermal near Ms). The solid solution treatment of aluminum alloy, copper alloy, titanium alloy, tempered glass and other materials or the heat treatment process with a rapid cooling process is also called quenching ！

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