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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。
Three different thermodynamic models were selected: (1) LFG model; (2) Xu Zuyao ternary system solution model; (3) Fisher-Xu model and Zener parameter; The driving force of martensitic transformation, the martensitic transformation drive force and the solution temperature of austenite at Ms have a linear relationship: △ G ~ (a →) M = Aσ 0.2 (Ms) + 908J / mol, the coefficients of selection for different models A ’are slightly different.With the derived austenite yield strength at Ms temperature, the MS temperature of Fe-Ni-C alloy is calculated and the calculated results are consistent with the previous experimental values well.