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在Gleeble-1500D模拟机上对核电用316LN奥氏体不锈钢的热拉伸行为进行了研究,获得了钢在变形温度900~1200℃、应变速率0.01~1 s-1条件下拉伸变形的真应力-真应变曲线。通过Deform-3D有限元软件模拟了热拉伸过程,利用迭代法对试样颈缩后对应的真应力-真应变曲线进行修正。对试样颈缩前塑性变形部分对应的真应力-真应变数据拟合处理,得到了不同变形条件下316LN奥氏体不锈钢的硬化指数。将修正后的真应力-真应变曲线和计算得到的硬化指数导入Deform-3D软件中模拟热拉伸过程,计算得到了316LN奥氏体不锈钢热变形时的断裂阈值。
The hot tensile behavior of 316LN austenitic stainless steel for nuclear power was studied on a Gleeble-1500D simulator. The true stress of the steel during tensile deformation at 900-1200 ℃ and strain rate of 0.01-1 s -1 was obtained - True strain curve. The hot drawing process was simulated by Deform-3D finite element software, and the true stress-true strain curve corresponding to the neck was corrected by iteration method. The true stress - true strain data corresponding to the plastic deformation before the neck shrinkage were fitted to get the hardening index of 316LN austenitic stainless steel under different deformation conditions. The corrected true stress-true strain curve and the calculated hardening index were introduced into Deform-3D software to simulate hot drawing process, and the fracture threshold of 316LN austenitic stainless steel during thermal deformation was calculated.