测定了合金元素在凝固时的有效分配系数，通过计算和实测解析了合金液相成分随凝固进程的变化规律，得到凝固过程中合金元素的有效分配系数、液相成分变化与凝固反应的关系.初晶相析出后，C含量低于3．0％时，共晶反应按γ＋MC，γ+M2C，γ+M7C3次序进行；C含量高于3.0％时，共晶反应按γ＋MC，γ+M7C3，γ+M2C次序进行各合金成分点距各自对应的共晶成分线距离愈长，则初生相愈多；反之，则共晶组织增多.γ＋MC共晶反应在C含量较低时可获得较多共晶MC.
The partition coefficients of elements during solidification were measured to investigate the forming mechanism of the solidification structure in Fe-C-5 Cr-5Mo-5W-V alloy. The changing of the alloy liquid composition with solidification process was analysed by calculation and experiment. The partition behaviour of alloy elements during solidification and the relationship between the change of liquid phase composition and solidilication reaction were determiend. After primary crystal had been formed in the alloy the eutectic reactions carried in the sequences of γ+MC, γ+M2C and γ+M7C3 when C content was lower than 3.0%, and in the sequences of γ+MC, γ+M7C3 and γ+M2C when C content was higher than 3.0%. The longer the distance between the alloy composition point and eutectic point, the more the primary crystal phase formed, on the contrary, the more eutectic structures formed. The eutectic reaction L→γ+MC occuring at low C content was beneficial to obtain more eutectic MC.
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