热变形奥氏体Ar_3温度的计算模型

Modelling for Calculating the Ar3 Temperature of HotDeformed Austenite

以超组元（Ｓｕｐｅｒｅｌｅｍｅｎｔ）模型、Ｃａｈｎ的相变动力学理论和Ｓｃｈｅｉｌ的叠加法则为基础，计算了Ｆｅ－ΣＸｉ－Ｃ（Ｘｉ＝Ｍｎ，Ｓｉ，Ｎｉ，Ｍｏ等）多组元低合金钢热变形奥氏体在连续冷却过程中γ→α相变的实际开始温度Ａｒ３，并分析了化学成分、γ相热变形和冷却速度对Ａｒ３温度的影响。

Based on the Superelement model, Cahn′s transformation kinetics theory and Scheil′s additivity rule, the starting temperature (Ar3) for γ→α transformation of hotdeformed austenite in multicomponent low alloy steels FeΣXiC (Xi=Mn, Si, Ni, Mo etc.) during continuous cooling process was calculated. The influences of chemical composition, hot deformation of γ and cooling rate on Ar3 were also analyzed.