选取了三种不同的热力学模型,(1)LFG模型;(2)徐祖耀三元系规则溶液模型;(3)本文处理方法(Fisher-徐模型加Zener参数),计算了Fe-Ni-C合金马氏体相变驱动力,求得马氏体相变驱动力与奥氏体在Ms温度的固溶强化呈线性关系:△G~(a→)M=Aσ_(0.2)(Ms)+908J/mol,对不同模型选取系数A’略有差异.利用所导出的奥氏体在Ms温度时的屈服强度,计算了Fe-Ni-C合金的MS温度,计算结果与以往的实验值符合得很好。
The driving force for martensite transformation,-△G_(M_S)~(γ→α)(=△G~(α→M)) has been evaluated using three different thermodynamic methods, namely, LFG method, Hsu method and the authors' method. The results show that the relationship between driving force and σ_(0.2)(M_s) can be expressed as: AG~(α→M)=A'σ(M_s)+908 J/mol wher eA' is a constant which slightly deviated for different methods. The M_s temperatures of Fe-Ni-C alloys have been calculated, and the results of calculation are in good agreement with the previous experimental values.
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