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采用砂型铸造方法研究了线性电磁搅拌对高温合金Incoloy800凝固组织的影响,用电子探针分析了铸锭中溶质元素的分布规律。实验结果表明:在高温合金砂型铸造的凝固过程中施加线性电磁搅拌,能够细化铸锭的等轴晶组织,增加铸锭断面等轴晶的比例;在较低的磁感应强度下,铸锭的宏观偏析和微观偏析均比较严重。增强磁感应强度后,由线性电磁搅拌引起的对流加速了熔体中过热的耗散,缩短了凝固时间;另外对流充分混合了熔池内各部分熔体,使得溶质元素在铸锭中的宏观偏析和微观偏析得到改善,从而大幅度提高了铸锭质量。
The effect of linear electromagnetic stirring on the solidification structure of Incoloy800 superalloy was studied by sand casting method. The distribution of solute elements in the ingot was analyzed by electron probe. The experimental results show that the linear electromagnetic stirring in the solidification process of superalloy sand casting can refine the equiaxed grain structure of ingot and increase the proportion of equiaxed grains in the ingot section. At lower magnetic induction, Macro-segregation and micro-segregation are more serious. After the magnetic induction intensity is increased, the convection caused by the linear electromagnetic stirring accelerates the overheating dissipation in the melt and shortens the solidification time. In addition, the convection fully mixes the melts in each part of the molten pool to make macrosegregation of solute elements in the ingot and Microsegregation is improved, thus greatly improving the ingot quality.