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在变形温度为950~1150℃,应变速率为0.01~10 s~(-1)、工程应变量为0.6的条件下,通过Gleeble-3800热模拟试验机对Nitronic50奥氏体不锈钢进行了单道次热压缩变形试验。通过引用Zener-Hollomon参数,对Nitronic50钢进行了本构方程的构建,不同变形条件下计算得到的峰值应力值与实际峰值应力值吻合程度较高。通过动态材料模型绘制了Nitronic50钢的能量耗散图,并结合变形后的组织发现能量耗散低反而易于得到较好的热变形组织,本试验条件下最佳的热变形工艺为变形温度在1000℃附近,变形速率1~10 s~(-1)。
Under the conditions of deformation temperature of 950 ~ 1150 ℃, strain rate of 0.01 ~ 10 s ~ (-1) and strain of 0.6, the single pass of Nitronic50 austenitic stainless steel was carried out by Gleeble-3800 thermal simulation tester Hot compression deformation test. The constitutive equation of Nitronic 50 steel was constructed by referring to the Zener-Hollomon parameter. The calculated peak stress values under different deformation conditions are in good agreement with the actual peak stress values. The energy dissipation diagram of Nitronic50 steel was drawn by the dynamic material model. Combined with the deformed structure, it was found that the energy dissipation was low but the thermal deformation was easy to obtain. The best thermal deformation process under the experimental conditions was deformation temperature 1000 ℃, the deformation rate is 1 ~ 10 s ~ (-1).