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对比分析了电磁搅拌磁场形式与强度对Pb-80Sn过共晶合金凝固组织及宏观成分偏析的影响。结果表明,螺旋磁场能够促进合金熔体在更大区域内流动,促使温度场、溶质场更均匀分布,从而改善合金凝固组织及成分偏析。搅拌频率一定时,旋转磁场和螺旋磁场在电流分别为125A和100A时对铸锭凝固组织的改善效果最好,晶粒尺寸由无磁场时的247.5μm分别减小为152.6μm和143.2μm;在电流为125A时两种形式磁场在改善成分偏析方面具有最佳效果,Sn含量差值分别由无磁场时的9.71%减小到1.37%和0.28%。
The influence of the magnetic field form and intensity of electromagnetic stirring on the solidification microstructure and macro-composition segregation of Pb-80Sn Hypereutectic Alloy was analyzed. The results show that the helical magnetic field can promote the flow of the alloy melt in a larger area and promote the more uniform distribution of the temperature field and the solute field so as to improve the segregation of the solidified structure and the composition of the alloy. When the stirring frequency is constant, the rotating magnetic field and helical magnetic field have the best effect on the solidification structure of the ingot when the currents are 125A and 100A, respectively. The grain size decreases from 247.5μm to 152.6μm and 143.2μm, respectively. When the current is 125A, the two kinds of magnetic fields have the best effect in improving the composition segregation. The difference of Sn content decreases from 9.71% to 1.37% and 0.28% respectively when there is no magnetic field.