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根据已发表的活度数据,重新讨论了 Fe-C 合金中心原子模型(CAM)中的热力学参数。利用中心原子模型计算了 Fe-C 合金的马氏体相变驱动力和 M_s。计算结果表明,碳含量较低时,Fe-C 合金马氏体相变驱动力与碳含量成线性递增关系。根据计算结果和徐模型推算了 Fe-C 合金奥氏体在 M_s点的强度。M_s 的计算与实验结果符合得较好。由 CAM 模型得到:M_s(K)=834-8277x_c
Based on the published activity data, the thermodynamic parameters in the Fe-C alloy center atomic model (CAM) are revisited. The central atom model was used to calculate the martensitic transformation driving force and M_s of Fe-C alloys. The calculation results show that when the carbon content is low, the martensitic transformation driving force and the carbon content of Fe-C alloy increase linearly. Calculate the strength of austenite at Fe-C alloy at M_s point according to the calculation results and Xu model. The calculation of M_s is in good agreement with the experimental results. From the CAM model: M_s (K) = 834-8277x_c