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对比分析了磁场和电磁搅拌频率对Pb-80%Sn过共晶合金铸锭凝固组织和宏观成分偏析的影响。结果表明:螺旋磁场可在合金熔体的更大区域内形成流动,使熔体内溶质场、温度场分布更均匀。励磁电流一定时,初生相晶粒尺寸随频率的增大而减小,旋转磁场和螺旋磁场在频率分别为13 Hz和10 Hz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247.3μm分别减小到142.5μm、140.6μm,继续增大频率,凝固组织反而出现粗化和不均匀化。旋转磁场和螺旋磁场均在频率为13 Hz时对成分偏析的改善效果最好,由无磁场时的9.71%分别减小到1.14%、0.34%。
The influence of magnetic field and electromagnetic agitation frequency on the solidification microstructure and macro-composition segregation of Pb-80% Sn hypereutectic alloy ingot was analyzed. The results show that the helical magnetic field can flow in a larger area of the alloy melt and make the solute field and temperature field in the melt more evenly distributed. When the exciting current is constant, the grain size of the primary phase decreases with the increase of the frequency. The rotating magnetic field and the helical magnetic field have the best effect on the solidification structure of the ingot at the frequencies of 13 Hz and 10 Hz respectively. The magnetic field of 247.3μm were reduced to 142.5μm, 140.6μm, continue to increase the frequency, but the coarsening of the solidified tissue and uneven. Both the rotating magnetic field and the helical magnetic field have the best effect on the component segregation at the frequency of 13 Hz, decreasing from 9.71% to 1.14% and 0.34% respectively when there is no magnetic field.