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以热压缩实验所得38MnVS6非调质钢微观组织演化数学模型为基础,利用非线性有限元软件MSC.Marc,建立了38MnVS6非调质钢Φ90mm棒材往复热轧过程三维热-力-组织多场耦合有限元模型。微观组织演化数学模型通过MSC.Marc子程序与轧制热-力耦合有限元模型相耦合。计算并分析了38MnVS6非调质钢棒材10道次往复热轧过程中轧件的温度、再结晶分数以及奥氏体晶粒尺寸的分布和演化。结果表明,由于截面尺寸较大,轧件的温度场具有不均匀性,进而导致微观组织场的不均匀性。轧制过程轧件表面温度及轧制后奥氏体晶粒尺寸的实验值和模拟值吻合较好,验证了模型的准确性。
Based on the mathematic model of microstructure evolution of 38MnVS6 non-quenched and tempered steel obtained by the hot compression test, the nonlinear finite element software MSC.Marc was used to establish the three-dimensional thermo-mechanical-mechanical multi-field during the hot and cold rolling process of 38MnVS6 non-quenched and tempered steel Φ90mm bar Coupled finite element model. The mathematical model of microstructure evolution is coupled with rolling thermo-mechanical coupled finite element model by MSC.Marc subroutine. The temperature and recrystallization fraction and the distribution and evolution of austenite grain size during the 10-pass reciprocating hot rolling of 38MnVS6 non-quenched and tempered steel bars were calculated and analyzed. The results show that due to the larger section size, the temperature field of the workpiece is inhomogeneous, which leads to the heterogeneity of the microstructure field. The experimental results of the rolling surface temperature and the austenite grain size after rolling agree well with the simulated values, which proves the accuracy of the model.