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在金属熔体周围的环绕线圈中,通入窄脉宽高频交变脉冲电流可以细化其凝固组织,这种组织细化方法称为脉冲磁致振荡。采用ANSYS有限元软件研究脉冲磁致振荡对纯铝熔体电磁力和流场的影响,主要包括线圈脉冲电流峰值,铸件直径及线圈尺寸位置等参数。模拟结果显示,脉冲电流峰值增加,熔体感应的电磁力也随着增大,振荡效果增强。铸件直径增大,电磁力驱使的内部流动效果会减弱。线圈尺寸增大,感应电磁力和熔体流动均增强。线圈下部的电磁力与流动分布导致晶粒的细化效果会优于上部。
Around the metal melt around the coil, the introduction of narrow pulse width and high frequency alternating current pulse can refine its solidified tissue, this method of tissue refining known as pulsed magnetostrictive oscillation. The influence of pulsed magnetostrictive oscillation on the electromagnetic force and flow field of pure aluminum melt was studied by ANSYS finite element software, including the peak value of the pulse current of the coil, the diameter of the casting and the location of the coil size. Simulation results show that the peak value of the pulse current increases, the electromagnetic force induced by the melt also increases, and the oscillation effect is enhanced. The diameter of the castings increases, and the effect of the internal flow caused by the electromagnetic force is weakened. Coil size increases, induced electromagnetic force and melt flow are enhanced. The electromagnetic force and flow distribution in the lower part of the coil lead to the grain refinement effect better than the upper part.