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Quenching: The quenching of steel is to heat the steel to a temperature above the critical temperature Ac3 (hypo-eutectoid steel) or Ac1 (hyper-eutectoid steel), and keep it for a period of time to make all or part of the austenite 1. The cooling rate of the critical cooling rate is a heat treatment process in which the cooling rate is rapidly cooled below Ms (or isothermal near Ms) to perform martensite (or bainite) transformation. The solution treatment of aluminum alloy, copper alloy, titanium alloy, tempered glass and other materials or the heat treatment process with rapid cooling process is also called quenching.