300M钢的热变形行为及其变形组织演变研究

基于热压缩实验,对300M钢在应变速率为10s-1下的热变形行为及其变形组织演变进行了研究。结果表明:在试样高度压下量为50%,变形温度为700～750℃时,300M钢的应力-应变曲线呈流变失稳型,且变形组织出现绝热剪切;当变形温度为800～1000℃时,300M钢的应力-应变曲线呈双峰不连续动态再结晶型,且热变形过程出现了两轮动态再结晶;当变形温度为1050～1180℃时,300M钢的应力-应变曲线呈单峰不连续动态再结晶型,且热变形过程只发生了一轮动态再结晶。

Investigation on hot deformation behavior and deformation structure evolution of 300M steel

Based on the hot compress test of 300M steel,the hot deformation behavior and the deformation structure evolution of 300M steel deformed at the strain rate of 10 s-1 were investigated.The results show that when the maximum of reduction of the test sample is 50%,the stress-strain curves of 300M steel are the rheological instability type at the deformation temperature range of 700-750 ℃ and the deformation structure appears adiabatic shearing;the stress-strain curves are the discontinuous dynamic recrystallization type with two peaks at the deformation temperature range of 800-1000 ℃,and there are two rounds of dynamic recrystallization during the hot deformation;the stress-strain curves are the discontinuous dynamic recrystallization type with only one peak at the deformation temperature range of 1050-1180 ℃,and there is only one round of dynamic recrystallization during the hot deformation.