以流变应力曲线的唯象特征和本构方程的传统理论为基础,针对高铌微合金钢开发出一种新的描述高温变形应力-应变曲线的数学模型。该模型包括两个基本方程,确立了应力与应变、温度、变形速率的数学关系,预测了加工硬化和动态再结晶各阶段流变应力的变化,预测结果与实验结果吻合良好。 Based on the phenomenological characteristics of the flow stress curve and the traditional theory of the constitutive equation, a new mathematical model describing the high temperature deformation stress-strain curve was developed for high niobium microalloyed steels. The model includes two basic equations, establishes the mathematical relationship between stress and strain, temperature and deformation rate, and predicts the change of flow stress during each stage of work-hardening and dynamic recrystallization. The predicted result is in good agreement with the experimental results.