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利用固体与分子经验电子理论对Fe-Co-cr系高合金钢马氏体的价电子结构进行了计算.结果表明,Co使α-Fe固溶体增加了8种结构单元,使nA值从原来的0.3835变为0.4684以上,增强了α-Fe基体的原子结合力.同时,Co也改变了C及其他合金元素形成的偏聚结构单元的价电子结构,使各个含C-Me偏聚单元的nA大幅度提高,从而改变了回火过程中碳化物等第二相的析出机制,增强了回火抗力.
The valence electron structures of the martensite in high Fe-Co-Cr alloyed steels were calculated by using the solid and molecular empirical electron theory. The results showed that the addition of Co to the α-Fe solid solution increased eight kinds of structural units, 0.3835 becomes 0.4684 or more, which enhances the atomic binding force of the α-Fe matrix. At the same time, Co also changes the valence electron structure of the segregated structure unit formed by C and other alloying elements so that nA Greatly increased, thereby changing the tempering process of precipitation of carbides and other second phase, enhanced tempering resistance.