Cr20Ni80电热合金电渣重熔数值模拟

采用ANSYS软件中的热电耦合单元,研究了电渣重熔过程中熔铸电流、冷却系数及渣池深度对金属熔池温度分布的影响。采用ProCAST软件中的CAFE模块模拟了铸锭的微观组织,并将模拟结果与实际实验的微观组织进行了对比。结果表明:随着电流的增加整体温度逐渐上升;随着冷却系数以及渣池深度的增加,熔池温度逐渐降低,熔池深度逐渐变浅。实际生产与软件模拟的Cr20Ni80电热合金组织都由表层细晶区、柱状晶区以及等轴晶区3部分组成,且晶粒大小相近,说明模拟结果与实验结果具有一定的吻合性。

Numerical Simulation for Electroslag Remelting of Cr20Ni80 Electrothermal Alloy

Through the electrical-thermal couple element of the software ANSYS, the influence of melting current, cooling coefficient and depth of slag to the metallic pool was studied in the process. The ingot microstructure was simulated by using the CAFE element of ProCAST software, and the difference of microstructure was studied between simulation and production. The results showed that, with increasing of the current, the metallic pool temperature was increased. With the increase of intensity of cooling coefficient and depth of slag, the metallic pool temperature was gradually decreased, and the depth of slag pool became shallower. The alloy in the process of practical production was the same as the result of computer simulation, as the microstructure was composed of three parts:the surface fine grain area, the columnar grain area and the equiaxed grain area. This showed that the simulation results agree well with the experimental results.