含Nb微合金钢动态再结晶行为  

Study on Dynamic Recrystallization Behavior of Nb-Microalloyed Steel

作　　者：董毅[1] 许云波[1] 肖宝亮[1] 吴迪[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：《东北大学学报（自然科学版）》2008年第10期1431-1434,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50504007)

摘　　要：用Gleeble-2000热模拟实验机对实验钢进行高温单道次压缩实验,研究了实验钢动态再结晶行为.实验结果表明:实验钢动态再结晶激活能为304.711 kJ/mol;在较高温度和低应变速率条件下实验钢易于发生动态再结晶,随着lnZ的减小,实验钢应力-应变曲线由动态回复型变为动态再结晶型;当lnZ<22.61时,曲线上出现多个峰值,呈间断式动态再结晶型;峰值应力、峰值应变和临界应变与lnZ呈线性关系;动态再结晶开始时间随着应变速率的增大和温度的升高而缩短.The dynamic recrystallization behavior of the specimens of Nb-microalloyed steel was tested on Gleeble- 2000 thermomechanical simulator by way of single pass at high temperature. The results revealed some facts about the specimen as follows. The dynamic recrystallization of which the activation energy 304. 711 kJ/mol is liable to occur at higher temperature and lower strain rate, and the stress- strain curve in form of dynamic recovery changes into dynamic recrystallization with decreasing InZ. The curves present several peaks, which means that it＇s in intermittent form of dynamic recrystallization when lnZ〈 22.61. It＇s found that the peak stress/ strain and critical strain all bear linear relationship with InZ. The starting time of dynamic recrystallization decreases with increasing strain rate and temperature.

关 键 词：动态再结晶 激活能 数学模型 峰值应力/应变 

分 类 号：TG111.3[金属学及工艺—物理冶金]