1Cr10Co6MoVNbN航空用不锈钢的热变形行为

Thermal deformation behavior of aerospace stainless steel 1Cr10Co6MoVNbN

采用Gleeble-3500热模拟实验机,研究了1Cr10Co6MoVNbN不锈钢在温度为800~1100℃、应变速率为0.01~10 s^(-1)下的热变形行为,得到了其应力-应变曲线,并构建了本构方程,分析了温度、应变速率和变形量对其微观组织的影响。结果表明:在热变形过程中,峰值应变会随着变形温度的降低或应变速率的增大而增大,不锈钢发生了动态再结晶,温度对动态再结晶的显微组织影响明显;在应变速率为1 s^(-1)时,再结晶体积分数及晶粒尺寸最小;在低应变速率下变形时,再结晶组织容易出现混晶。通过θ-σ曲线确定了其临界应力与峰值应力、临界应变与峰值应变的关系。

The thermal deformation behavior of 1Cr10Co6MoVNbN stainless steel under the temperature of 800-1100℃and the strain rate of 0.01-10 s^(-1) was studied by thermal simulation experimental machine Gleeble-3500,and the stress-strain curve was obtained.Then,the constitutive equation was constructed,and the influences of temperature,strain rate and deformation amount on its microstructure were analyzed.The results show that during the thermal deformation process,the peak strain increases with the decreasing of deformation temperature or the increasing of strain rate,the dynamic recrystallization occurs,and the temperature has obvious influence on the microstructure of dynamic recrystallization.When the strain rate is 1 s^(-1),the recrystallization volume fraction and the grain size are the smallest.When deformed at low strain rate,the recrystallized structure is prone to mixed crystal.The relationships between critical stress and peak stress,and between critical strain and peak strain are determined byθ-σcurve,respectively.