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通过模拟钢连铸金属凝固的条件,以低熔点合金为研究对象,分析了螺旋磁场对凝固组织的影响。发现螺旋磁场能够消除成分偏析、碎断枝晶和细化凝固组织。同时,对比研究了不同磁场方式对凝固组织的影响。在相同电磁搅拌参数下,螺旋磁场比旋转磁场更能减小铸锭上下部成分之间的差异并细化晶粒,对促进铸锭成分均匀化有更好的效果;螺旋磁场电磁力分布更有利于形成较大区域的均匀搅拌,对形成等轴晶有明显的促进作用,且晶粒排列的方向性比旋转磁场处理下的更小,即各向同性效果更好。
By simulating the conditions of steel continuous casting metal solidification, taking the low melting point alloy as the research object, the influence of the helical magnetic field on the solidified structure was analyzed. The spiral magnetic field was found to eliminate component segregation, break dendrites and refine solidified tissue. In the meantime, the influence of different magnetic field modes on the solidified structure was comparatively studied. Under the same parameters of electromagnetic stirring, the helical magnetic field can reduce the difference between the upper and lower parts of the ingot and refine the grains better than the rotating magnetic field, which has a better effect on the homogenization of the ingot. The distribution of electromagnetic force in the helical field is more Which is advantageous to uniform stirring in the formation of a large area and obviously promotes the formation of equiaxed grains. The orientation of the grains is smaller than that under the rotating magnetic field treatment, that is, the isotropic effect is better.