316L/EH40不锈钢复合板热轧过程中晶粒组织的均匀性

Homogeneity of grain structure for 316L/EH40 stainless steel clad plate during hot rolling process

为了改善热轧不锈钢复合板晶粒组织的均匀性,采用正交试验优化设计方法设计数值模拟方案,研究轧制工艺参数对基层不均匀因子、基层平均晶粒尺寸、复层不均匀因子和复层平均晶粒尺寸的影响,分析各参数的影响显著性顺序,并采用综合平衡法得到优选参数组合,轧制压下率为60%,轧制温度为1100℃,轧制速度为300mm/s。对优化后的参数组合进行有限元模拟,得到了热轧过程中沿不锈钢复合板厚度方向晶粒尺寸的分布及其变化规律。通过试验与仿真模拟获得的晶粒尺寸进行对比验证,得出晶粒尺寸误差在5%以内,验证了有限元模型的正确性与可靠性。

In order to improve the uniformity of the grain structure of the hot-rolled stainless steel clad plate,the numerical simulation scheme was designed by the orthogonal experimental optimization design method.The effects of rolling parameters on the non-uniformity factor of the base,the average grain size of the base,the non-uniformity factor of clad and the average grain size of the clad were studied,and the order of the significant effects of each parameter was analyzed.The comprehensive equilibrium method was used to obtain the optimum scheme.Optimum parameters were,the rolling reduction rate is 60%,the blooming temperature is 1100℃and the rolling rate is 300 mm/s.The optimized parameters were simulated by the finite element method,and the distribution and the variation of the grain size along with the thickness direction of the stainless steel clad plate during the hot rolling were obtained.By comparing the grain size obtained by experiments and simulations,the error of the grain size is less than5%,which verifies the correctness and reliability of the finite element model.