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OALib Journal期刊
ISSN: 2333-9721
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电磁搅拌频率对pb--sn过共晶合金凝固组织的影响
Keywords: 金属材料,电磁搅拌,磁场频率,凝固组织,pb--sn过共晶合金
Abstract:
？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13hz和10hz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247.3？μm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13hz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%。
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