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科学的金属学的始创者和曾经指出(参考书1、2),将被淬火的鋼在冷到200°左右的温度上进行保温,随後再在空气中冷却,所得的机械性能要比直接在油(或水)中冷却者为佳。从上世纪三十年代开始,在乌拉尔很多工厂中,就曾以类似的淬火方法用来处理工具种含碳高於0.5％的钢所制造的小零件。鋼在这种等温保持时所以生的转变,後来曾由进行了研究(参考书3)。他指出,特别是在低於200°,亦即在形成淬火鋼组织——麻顿赛體的温度范围内缓慢冷却时,可使淬火鋼中保留较多量的殘留奥斯田體,并可減小淬火时體積的变化。分级淬火法(卽在接近麻顿赛體开始形成点M_H
The founding fathers of scientific metallurgy and once pointed out (Refs. 1 and 2) that the steel to be quenched is cooled to a temperature of about 200 ° C and then cooled in air, resulting in a ratio of mechanical properties It is better to cool directly in the oil (or water). Since the 1930s, similar quenching methods have been used in many Ural factories to process small parts made of steels containing more than 0.5% carbon. The transformation of steel at this isothermal holding was followed by research (Ref. 3). He pointed out that, especially at temperatures below 200 ° C, ie during slow cooling in the temperature range in which the hardened steel structure, the Morton was formed, a greater amount of retained otus can be retained in the hardened steel and can be reduced Small quenching volume changes. Classification quenching method (卽 near the beginning of the formation of the Dayton event point M_H