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Specific analysis of the principle: The quenching of steel is to heat the steel to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel) and keep it warm for a period of time to make all or part of the austenite 1, and then A heat treatment process in which martensite (or bainite) transformation is performed by rapidly cooling below Ms (or isothermal near Ms) at a cooling rate greater than the critical cooling rate.