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淬火就是把钢加热到临界温度Ac_3以上(过共析钢加热到Ac台以上),然后根据它的有效厚度,保持一定的时间,使钢的内部组织转变为成均匀的奥氏体(过共析钢是奥氏体和渗碳体)。接着再从这个相变的温度迅速地冷却下来,在奥氏体组织还来不及扩散和分解的条件下,很快的冷却到马氏体的转变温度M_H点,使得这过冷的奥氏体组织,转变成为马氏体的组织。钢料由于内部组织是马氏体,就具有最高的硬度,用它制成的零件耐磨性和使用
Quenching is the heating of the steel to above the critical temperature Ac_3 (hypereutectically heated steel to Ac above), and then according to its effective thickness, to maintain a certain period of time, the internal organization of steel into uniform austenite Analysis of steel is austenite and cementite). And then quickly cooled down from the temperature of this phase transformation, the austenitic tissue is too late to spread and decomposition conditions, the rapid cooling to the martensitic transformation temperature M_H point, making this undercooling austenitic tissue , Transformed into martensite organization. Due to the internal structure of steel is martensite, it has the highest hardness, wear-resistant parts made of it and use