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本文采用Ｆｉｓｈｅｒ模型及较新的热力学数据，对纯铁和铁氮合金马氏体转变点进行了计算，得出纯铁的Ｍｓ点为８３４Ｋ，铁氮合金马氏体点与氮含量的关系可表达为：Ｍｓ（Ｋ）＝８４０－５９４５ＸＮａｔ％。
In this paper, Fisher’s model and newer thermodynamic data were used to calculate the martensitic transformation point of pure iron and ferronickel alloy. The result shows that the Ms point of pure iron is 834K. The relationship between the martensite point and the nitrogen content of ferronickel alloy Expressed as: Ms (K) = 840-5945XNat%.