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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,并应用CAFE法模拟了易切削钢9SMn28的三维微观组织,优化了9SMn28的成分。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耦合是通过FE节点和CA元胞之间的插值实现的。易切削钢9SMn28微观组织模拟结果与实验吻合较好,确定的碳、磷、锰、硅、硫的最佳质量分数分别为0.15%、0.10%、1.2%、0.08%、0.36%,并对优化结果进行了模拟,有效地改善了9SMn28的凝固组织。
The physical essence and numerical calculation method of CAFE method to simulate the microstructure of solidification process were analyzed. The three-dimensional microstructure of free-cutting steel 9SMn28 was simulated by CAFE method and the composition of 9SMn28 was optimized. In the CAFE model, the nucleation density is described by Gaussian distribution. The growth kinetics of dendrite tip is calculated by KGT model. The preferred orientation of dendrite growth is <100> and the competition mechanism of dendrite growth can be achieved. FE and CA coupling is achieved by interpolation between FE nodes and CA cells. The microstructure of free-cutting steel 9SMn28 is in good agreement with the experimental results. The optimum mass fractions of carbon, phosphorus, manganese, silicon and sulfur are 0.15%, 0.10%, 1.2%, 0.08% and 0.36% Results were simulated to effectively improve the coagulation of 9SMn28.