控轧控冷中奥氏体相变行为的预测模型

Modelling for Prediction of Austenite Transformation Behaviour during Controlled Rolling and Controlled Cooling

以规则溶液亚点阵模型和超组元模型为热力学基础、Ｃａｈｎ的相变动力学理论为动力学基础，并根据Ｓｃｈｅｉｌ叠加法则和热膨胀实验结果，建立了应用于连续冷却过程，低合金钢热变形奥氏体向铁素体、珠光体和贝氏体转变的相变行为预测模型。根据一种ＨＳＬＡ钢实验室模拟实验条件计算所得到的各相相变开始温度和相变率与实测值符合得较好。

On the thermodynamic basis of regular solution sub lattice model and superelement model, kinetic basis of Cahn ′s transformation kinetic theory, and according to Scheil ′s additivity rule and experimental results obtained by thermal dilation method, a prediction model of transformations from hot deformed austenite to ferrite, pearlite and bainite in low alloy steels,which can be applied to continuous cooling process, is developed in the present paper. The calculated transformation start temperatures and transformed fractions of each phase based on laboratory controlled rolling and controlled cooling conditions in one low alloy steel are in reasonable agreement with the measured ones.