奥氏体钢马氏体相变点M_s、M_（εs）

MARTENSITE TRANSFORMATION POINT M_s AND M_(εs)OF AUSTENITIC STEEL

在计算机上回归处理了大量试验结果，得到了奥氏体钢的Ｍ＿ｓ、Ｍ＿εｓ定量经验计算式：Ｍ＿ｓ（Ｋ）＝７３１－２２７（Ｃ＋Ｎ）－１７．６Ｎｉ－２２．５Ｍｎ－１７．３Ｃｒ－１６．２ＭｏＭ＿εｓ（Ｋ）＝６３０－２６１．４（Ｃ＋Ｎ）－１３．７Ｍｎ－１３．１Ｃｒ－１７．９Ｎｉ－３８．５Ａｌ在热力学上从层错能及Ｍ＿ｓ、Ｍ＿εｓ的相对变化角度较好地解释了奥氏体钢的γ→α，γ→ε→α，γ→ε相变，并且进一步用试验数据验证，结果也较满意。

Through microcomputer treatment, the relationships of M_s and M_εs to the composition of austenitic steel can be obtained as followed:M_s(K)=731-227(C+N)-17. 6Ni-22.5Mn-17.3Cr-16.2Mo M_εs(K)=630-261.4(c+N)-13. 7Mn-13. 1Cr-17. 9Ni-38.5Al The phase transformations of γ→α,γ→ε→α, and γ→ε of austenitic steel is studied with the stacking-fault energy and variation of M_s and M_εs.