合金元素对热变形奥氏体再结晶的影响

为了突出合金元素对再结晶模型的影响,以Avrami方程为动力学基础,对现有模型进行修正,建立了热变形奥氏体再结晶动力学模型,确定动态、静态再结晶分数与温度、变形条件和化学成分的函数关系,并采用单道次和双道次压缩实验验证了Si-Mn钢和Nb-V钢再结晶动力学模型.结果表明:低合金和微合金元素均能抑制再结晶的发生,使流变应力增高;计算值和测量值吻合得很好,充分证明了模型的准确性.

Influence of alloying elements on recrystallization kinetics of hot deformed austenite

In order to study the influence of alloy elements on recrystallization, a new model was developed to predict recrystallization of hot deformed austenite. On the basis of Avrami equation and some established models. The new model is to determine the functional relationships of dynamic, static recrystallized fractions with deforming temperature, strain, strain rate and chemical compositions. Hot compression single and double hit experiments validated the kinetics of recrystallization modelling of hot-rolled Si - Mn steel and Nb - V steel. The results show that addition of low alloyed elements and microalloyed elements retards both dynamic and static recrystallization as well as increases the flow stress of austenite. The calculated values are matched to the measured ones,which verifies the correctness of the mathematical modellings.