从X光和电子显微镜等实验的结果证明高碳钢在80—160℃之间第一回火阶段中,含碳多的四方马氏体转变成为含碳较少的马氏体,同时形成碳化物。这种碳化物可能就是渗碳体,或许是六方的所谓碳化物。在马氏体恒温分解过程中,分解时率起先快,后来慢。未分解部分随时间最初将近作一次方的指数关系,越后则越不到一次方。 From the results of X-ray and electron microscopy experiments, it was proved that in the first tempering stage of high-carbon steel between 80-160 ° C, the martensite having a large amount of carbon is transformed into the martensite containing less carbon and the carbonized Things. This carbide may be cementite, perhaps the so-called hexagonal carbide. In the process of martensite decomposition, the decomposition rate from the first fast, then slow. The uncomplicated part will first be approximated as an exponential relationship for the first time over time, the less it will be after the first time.