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利用Gleeble-1500D热模拟试验机对316LN奥氏体不锈钢进行单道次热压缩试验,分别设置变形温度为900~1200℃、应变速率为0.001~10 s-1、真应变为0.1~0.9及试样的初始晶粒度为122~297μm之间,以研究热变形条件及初始晶粒度对316LN钢动态再结晶行为的影响.对试验数据进行处理,得到临界应变与峰值应变以及临界应力与峰值应力的比值分别为0.38和0.89,建立了动态再结晶动力学方程和晶粒尺寸演变方程.对建立的动态再结晶模型进行修正,将修正后的模型嵌入DEFORM-3D有限元模拟软件中进行计算,发现修正模型的模拟值和试验值符合较好,证明修正模型的准确性.
Single-pass hot compression tests on 316LN austenitic stainless steel were carried out by using Gleeble-1500D thermal simulation tester. The deformation temperature was 900-1200 ℃, the strain rate was 0.001-10 s-1, the true strain was 0.1-0.9, and the test The initial grain size was between 122 and 297μm in order to study the effect of hot deformation conditions and initial grain size on the dynamic recrystallization behavior of 316LN steel.The experimental data were processed to obtain the critical strain and peak strain and the critical stress and peak value Stress ratio of 0.38 and 0.89 respectively, dynamic recrystallization kinetics equation and grain size evolution equation were established.The dynamic recrystallization model was modified, and the modified model was embedded into DEFORM-3D finite element simulation software to calculate It is found that the simulated value of the modified model is in good agreement with the experimental value, which proves that the accuracy of the modified model is correct.