摘要
采用Gleeble 3800热力模拟实验机,研究了一种Ti微合金钢在850～1 150℃、0.1和1.0 s-1条件下的变形奥氏体的动态再结晶行为及再结晶后奥氏体晶粒尺寸的演化规律。结果表明:形变激活能与变形条件相关,随着应变速率的增加而增加;Avrami指数m同样与变形条件有关;对实验数据进行回归分析后建立的Ti微合金钢动态再结晶的特征应变、特征应力、动力学以及稳定状态晶粒尺寸的数学模型精度较高。
The dynamic recrystallization(DRX) behavior of Ti micro-alloyed steel under different deformation conditions was studied by using a Gleeble 3800 thermo/mechanical simulator.The results show that the activation energy of deformation is connected with deformation condition,and it increases with the increase of strain rate.The Avrami exponent m is connected with deformation condition as well.Using regression analysis,the DRX model of characteristic strain,characteristic stress,dynamics and grain size at stable condition for the steel was eslablished,and the predicted and measured values are in good agreements.
出处
《热加工工艺》
CSCD
北大核心
2006年第24期1-3,7,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(50474086和50334010)
教育部基金资助项目(NCET-04-0278)
关键词
动态再结晶
特征应变
形变激活能
TI微合金钢
dynamic recrystallization
characteristic strain
activation energy of deformation
Ti micro-alloyed steel
