316L不锈钢热加工硬化行为及机制
来源期刊：金属学报2010年第1期
论文作者：宋仁伯 项建英 侯东坡 任培东
文章页码：57 - 61
关键词：316L不锈钢； 热加工硬化； Crussard-Jaoul分析法； 动态再结晶； 孪晶
Key words：316L stainless steel； hot work-hardening； Crussard-Jaoul analysis； dynamic recrystallization； twin
摘 要：在Gleeble-1500热模拟试验机上,通过高温压缩实验对316L不锈钢的热加工硬化特点和机制进行了研究。根据Ludwik幂函数模型对实验数据进行了非线性拟合,并用Crussard-Jaoul分析法计算了Ludwik幂函数模型的n值。实验结果表明:316L不锈钢在热变形过程中易发生加工硬化,真应力-应变曲线上未出现应力峰值;热变形过程中发生了部分动态再结晶,这一不完全的软化机制无法抵消热加工硬化的作用,另外在热变形过程中发生了孪生行为,这是热加工硬化的主要机制之一。
Abstract: The characteristics of hot work-hardening for 316L stainless steel have been systematically studied through high temperature compression tests on the Gleeble-1500 thermal simulation testing machine.According to Ludwik true stress-strain model,the experimental data has been regressed by using nonlinear fitting method,and the n value in Ludwik model,a comprehensive index which reflects the competitive result between work-hardening and softening,has been calculated with Crussard-Jaoul method.The dynamic recrystallization and twinning were observed by OM and TEM. The experiments reveal that 316L stainless steel is easy to work-hardening during hot deformation, and deformation rate can effect nC-J-εcurves and variation law;There is no peak stress on its true stress-strain curves,but partial dynamic recrystallization has occurred during hot working process. This incomplete softening mechanism can’t counteract the effect of hot work-hardening,so the true stress-strain curves still rise with deformation increasing;In addition,twinning occurred during hot working is one of the major mechanisms of hot work-hardening.
宋仁伯1，项建英1，侯东坡1，任培东2
(1.北京市北京科技大学材料科学与工程学院
2.酒泉钢铁股份有限公司技术中心)
摘 要：在Gleeble-1500热模拟试验机上,通过高温压缩实验对316L不锈钢的热加工硬化特点和机制进行了研究。根据Ludwik幂函数模型对实验数据进行了非线性拟合,并用Crussard-Jaoul分析法计算了Ludwik幂函数模型的n值。实验结果表明:316L不锈钢在热变形过程中易发生加工硬化,真应力-应变曲线上未出现应力峰值;热变形过程中发生了部分动态再结晶,这一不完全的软化机制无法抵消热加工硬化的作用,另外在热变形过程中发生了孪生行为,这是热加工硬化的主要机制之一。
关键词：316L不锈钢； 热加工硬化； Crussard-Jaoul分析法； 动态再结晶； 孪晶
