摘要
通过Gleeble-1500热模拟机上的高温压缩实验（温度800～1100℃；应变速率范围0．1～10s-1），研究了Fe—cr—Ni超级奥氏体不锈钢的高温热变形行为。显微组织观察表明，在高温大应变速率条件下，可获得细小的再结晶晶粒；再结晶晶粒尺寸与参数z呈指数关系。此外，通过对实验数据的计算和线性回归，分别得到试验钢的热激活能（为466．14kJ／m01）、热变形的本构方程、不同温度与应变速率下的峰值应力和Zener-Hollomon（z）参数，其中，峰值应力和发生动态再结晶的临界应力与参数z呈线性关系。
Hot compression tests were conducted on a Gleeble 1500 thermal-mechamcal simulator to investigate me not ctelormatmn behavior of a new superaustenitie stainless steel. The results show that the effects of the temperature and strain rate on dynamic reerystallization are evident. At higher defomation temperature and larger strain rates, smaller recrystallized grains will be obtained, and the grain size of dynamic recrystallization shows exponential relationship with the parameter Zener-Hollomon （Z）. Through fitting and analyzing the experimental data, the hot deformation activation energy of 466.14 kJ/mol for the steel is calculated. The hot deformation equation and the relationships between the peak stress, the critical stress of the occurrence of dynamic recrystallization and Z parameter are obtained. The peak stress and the critical stress show both a good linear relationship with Z parameter.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第9期102-106,共5页
Transactions of Materials and Heat Treatment
基金
国家重点基础发展计划资助项目(2007CB209800)
关键词
奥氏体不锈钢
动态再结晶
热变形
峰值应力
晶粒尺寸
austenitic stainless steel
dynamic recrystallization
hot deformation
peak stress
grain size
