高铌微合金钢高温变形流变应力预测模型  

Prediction Modelling of Stress-Strain Curves of High Nb Microalloyed Steel During Hot Deformation at High Temperature

作　　者：肖宝亮[1] 许云波[1] 董毅[1] 刘振宇[1] 王国栋[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110004

出　　处：《钢铁研究学报》2008年第9期28-31,共4页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(50504007)

摘　　要：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。A mathematical model has been developed to predict the stress-strain curves of a high Nb microalloyed steel during hot deformation. This model is based on a phenomenological representation of the shape of the stressstrain curves and the traditional theories for constitutive equations. The model consists basically of two expressions in which the stress is a function of strain, temperature, strain rate and the chemical composition of the steel. The complete equations predict the hardening and the softening caused by dynamic recrystallization. The stressstrain curves of HTP steel obtained by this model are in good agreement with experimental results.

关 键 词：动态再结晶 数学模型 激活能 峰值应力 

分 类 号：TG142.33[一般工业技术—材料科学与工程]