一、问题的提出在用X射线衍射法测定钢中残余奥氏体含量时,一般都沿用Cohen方法来处理,其结果是以残余奥氏体含量的体积百分数V_A表示 V_A=(1-V_c)/(1+G_M~A(I_M/I_A) (1)式中A、M、C分别为奥氏体、马氏体和碳化物,I为衍射峰实测累积强度,G_M~A为奥氏体对马氏体的G因子。钢中碳化物含量很少时, First, the issue put forward In the determination of residual austenite content of steel by X-ray diffraction, are generally followed by the Cohen method to deal with the results of the volume fraction of retained austenite V_A said V_A = (1-V_c) / (1 + G_M ~ A (I_M / I_A) (1) where A, M and C are respectively austenite, martensite and carbide, I is the measured cumulative intensity of the diffraction peak, G_M ~ A is austenite On the martensite G factor. When the steel content of the carbide is small,