热变形参数对410S不锈钢应力应变曲线及显微组织的影响

Effect of Thermal Deformation Parameters on Strain-stress Curves and Microstructure of 410S Steel

在Themoresto-W热模拟试验机上对410S不锈钢进行压缩试验,获得不同变形条件下的真应力-真应变曲线,用JP-200型倒置金相显微镜观察不同温度下410S压缩试样的显微组织;分析了应变速率为2.5 s-1时,变形温度对真应力-真应变曲线的影响,变形温度和变形部位对压缩试样显微组织的影响。结果表明,在相同应变速率下,真应力随变形温度增加而下降;试样中心部位受力及变形情况最彻底,为显微组织最好观察区域;随变形温度升高,再结晶变得越来越易进行,动态再结晶程度和晶粒尺寸也均增大。

A series of tests of 410S steel were performed on themoresto-W thermal simulator,and the true strain-true stress curves were obtained at different deformation circumstances. The microstructure of 410S steel was observed by microscope JP-200. The influence of deformation temperature on the true strain-stress curves was analyzed and the influence of deformation temperature and deformation area on the microstructure of 410S steel sample was studied. The results show that the true stress decreases with the increase of deformation temperature when the strain rate is constant; the central zone of the sample is the best deformation area in which the best microstructure can be observed; as the deformation temperature becomes higher, the recrystallization microstructure can be obtained. The extent of dynamic recrystallization and grain size also become larger.