螺旋磁场对Pb-80Sn合金凝固组织的影响  

Effects of Spiral Magnetic Field Intensity on the Solidification Structure of Pb-80Sn Hypereutectic Alloy

作　　者：郭建设[1] 潘志林 樊洋[1] 

机构地区：[1]南车戚墅堰机车车辆工艺研究所有限公司 [2]航天精工股份有限公司

出　　处：《特种铸造及有色合金》2014年第8期860-864,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(50875031);宝钢高新技术项目(10K029ECES)

摘　　要：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%。Effects of magnetic field and intensity of electromagnetic stirring on solidification structure and macro-composition segregation of Pb-80Sn cast ingots were investigated. The results show that spiral magnetic field has a better effect in improving the solidification structure and macro composition segrega tion through promoting a large zone stirring for alloy melt to make the solute and temperature field dis tribution more uniform. At a fixed frequency, the solidification structure exhibits desirable when the current is 125 A for rotating magnetic field and 100A for spiral magnetic field, where the grain sizes are reduced to 152.6μm and 143.2 μm from 247.5 μm without magnetic field, respectively. The composi- tion segregation is relieved greatly when the current is 125 A for both rotating and spiral magnetic field, reduced to 1.37% and 0. 28% from 9.71% in the absence of magnetic field, respectively.

关 键 词：磁场强度 凝固组织 Pb-80Sn过共晶合金 

分 类 号：TG291[金属学及工艺—铸造]