三种局部平衡模式下Fe-∑X_i-C合金系相变的超组元模型

Superelement model for Fe-∑X_i -C alloy systems' phase transformation under three different local equilibrium models

将正平衡(Ortho-equilibrium,OE)、准平衡(Para-equilibrium,PE)和忽略分离的局部平衡模型(Negligible/No partition localequilibrium,NPLE)引入超组元模型的计算中,计算了Fe-0.1C-1.5Mn-0.5Si和Fe-0.21C-0.51Mn-0.2Si钢在γ→α+γ'、γ→α+cem转变过程中的相界面浓度、相变驱动力和相变平衡开始温度。3种局部平衡模式下计算得到的Ae3、Ae1与Thermo-Calc计算值和文献实测值吻合较好,误差在4%以内。

The three different local equilibrium models,ortho-equilibrium（OE）,para-equilibrium（PE） and negligible /no partition local equilibrium（NPLE）,are introduced into the superelement model for the phase transformation thermodynamics calculation.The phase interface concentration,phase transformation driving force and phase transition equilibrium temperature are calculated in the transformation processes of γ→α ＋ γ＇,γ→α ＋ cem for Fe-0.1C-1.5Mn-0.5Si and Fe-0.21C-0.51Mn-0.2Si steels.The Ae3 and Ae1calculated under three local equilibrium models are in good agreement with the values calculated by Thermo-Calc and the ones measured in literature,the deviations are less than 4%.