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采用Gleeble3800热模拟试验机对16Cr超级马氏体不锈钢进行高温热压缩试验,测得其高温流变应力曲线。通过双曲正弦模型构建了试验钢的热变形本构方程,获得了该钢的热变形表观激活能Q为533.018 k J/mol。根据材料动态模型绘制试验钢热加工图,结合高温变形后显微组织,确定可行热加工工艺参数:变形温度为925~1025℃,应变速率为0.01~0.1 s~(-1);变形温度为1050~1100℃,应变速率为0.1~10 s~(-1)。此时试验钢组织发生了完全动态再结晶,晶粒明显细化,且对应的能量耗散效率较高。
High-temperature hot compression tests were carried out on 16Cr super martensitic stainless steel with Gleeble3800 thermal simulation tester. The high-temperature rheological stress curves were measured. The constitutive equation of thermal deformation of the test steel was constructed by hyperbolic sine model. The thermal deformation apparent activation energy Q of the steel was 533.018 kJ / mol. According to the material dynamic model, the hot working drawing of the test steel is drawn, and the microstructure of the hot deformed steel is combined to determine the feasible hot working parameters: the deformation temperature is 925-1025 ℃ and the strain rate is 0.01-0.1 s -1; the deformation temperature is 1050 ~ 1100 ℃, the strain rate is 0.1 ~ 10 s ~ (-1). In this case, the dynamic microstructure of the test steel completely recrystallizes, the grain is obviously refined, and the corresponding energy dissipation efficiency is higher.