The effect of the pulsed magnetic field on the grain refinement of superalloy K4169 has been studied in directional solidification. In the presence of the solid–liquid interface condition, the distributions of the electromagnetic force, flow field, temperature field, and Joule heat in front of the solid–liquid interface in directional solidification with the pulsed magnetic field are simulated. The calculation results show that the largest electromagnetic force in the melt appears near the solid–liquid interface, and the electromagnetic force is distributed in a gradient. There are intensive electromagnetic vibrations in front of the solid–liquid interface. The forced melt convection is mainly concentrated in front of the solid–liquid interface, accompanied by a larger flow velocity. The simulation results indicate that the grain refinement is attributed to that the electromagnetic vibration and forced convection increase the nucleation rate and the probability of dendrite fragments survival, for making dendrite easily fragmented, homogenizing the melt temperature, and increasing the undercooling in front of the solid–liquid interface.

中文翻译：

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定向凝固中固液界面脉冲磁场对高温合金熔体影响的模拟

在定向凝固过程中，研究了脉冲磁场对超合金K4169晶粒细化的影响。在存在固液界面条件的情况下，模拟了在脉冲磁场定向凝固下固液界面前的电磁力，流场，温度场和焦耳热的分布。计算结果表明，熔体中最大的电磁力出现在固液界面附近，并且电磁力呈梯度分布。固液界面前存在强烈的电磁振动。强制熔体对流主要集中在固液界面的前面，并伴随着较大的流速。