材料期刊网

摘 要：研究和分析了CAFE法模拟凝固过程微观组织的物理本质、数值计算方法。在CAFE模型中，形核密度用高斯分布来描述；枝晶尖端生长动力学用KGT模型进行计算；枝晶生长的择优取向是<100>方向，并可实现枝晶生长的竞争机制；FE与CA的耦合是通过FE节点和CA元胞之间的插值实现的。应用CAFE法模拟了易切削钢9SMn28的三维微观凝固组织，模拟结果与实验吻合较好。对易切削钢9SMn28进行了成分优化，并对优化结果进行了模拟，有效的改善了9SMn28的凝固组织。

Abstract：A CAFE method of numerical simulation of 3D-microstructure in solidification processes was studied. The nucleation density was described by Gaussian distribution. Calculation of kinetics of the dendrite tip growth was done according to the model of KGT. The crystallographic orientation <100> was selected preferentially, and the competition of crystal growth was developed directly in CAFE method. The Coupling of FE – CA was realized through the interpolation between FE mesh and CA cells. Based on a CAFE method, 3D-microstructure of 9SMn28 free-cutting steel were simulated in solidification processes, and the simulation results were consistent with that of experiment. The compositions of 9SMn28 free-cutting steel were optimized. With the optimization results the solidification microstructure was simulated to be improved obviously.