电磁搅拌对金基合金凝固组织和心部缺陷的影响
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摘要
分别采用传统模铸与电磁搅拌工艺制备金基合金,研究了不同电流参数对金基合金枝晶组织和心部缺陷的影响。结果表明:电磁搅拌可以明显降低金基合金微观组织的枝晶化程度,与此同时,消除了在传统模铸条件下金基合金铸锭心部所普遍出现的中心缩孔和缩松等缺陷。对电磁搅拌作用下,金基合金凝固组织的细化和铸锭心部缺陷的消除机理进行了探讨。
Gold-based alloys were prepared by electromagnetic stirring and conventional die casting separately. The effects of electromagnetic field on as-cast microstructure and central defects of the gold-based alloys were investigated. The results show that the dendritic structure of the gold-based alloy billets prepared by electromagnetic stirring is more uniform and smaller than that by conventional casting. Meanwhile, such defects as shrinkage cavity and porosity that frequently occur in the central region of gold-based alloy ingot produced by conventional die casting are eliminated. Moreover, the mechanism of refinement of the solidification structure and elimination of central defects by electromagnetic stirring were also discussed.
Gold-based alloys were prepared by electromagnetic stirring and conventional die casting separately. The effects of electromagnetic field on as-cast microstructure and central defects of the gold-based alloys were investigated. The results show that the dendritic structure of the gold-based alloy billets prepared by electromagnetic stirring is more uniform and smaller than that by conventional casting. Meanwhile, such defects as shrinkage cavity and porosity that frequently occur in the central region of gold-based alloy ingot produced by conventional die casting are eliminated. Moreover, the mechanism of refinement of the solidification structure and elimination of central defects by electromagnetic stirring were also discussed.
引文
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[3]Campbell J.Complete Casting Handbook:Metal Casting Processes,Techniques and Design[M].Oxford:ButterworthHeinemann Press,2011:499
[4]Cui Zhongqi(崔忠圻),Qin Yaochun(覃耀春).Metallography and Heat Treatment(金属学与热处理)[M].Beijing:China Machine Press,2007:126
[5]Zuo Y B,Nagaumi H,Cui J Z.Journal of Materials Processing Technology[J],2008,197(1-3):109
[6]Metan V,Eigenfeld K,Rabiger D.Journal of Alloys and Compounds[J],2009,487(1-2):163
[7]Mapelli C,Gruttadauria A,Peroni M.Journal of Materials Processing Technology[J],2010,210(2):306
[8]Jin Wenzhong(金文中),Bai Fudong(白富栋),Li Tingju(李廷举)et al.Rare Metal Materials and Engineering(稀有金属材料与工程)[J],2008,37(5):784
[9]Zhang Qin(张勤),Cui Jianzhong(崔建中),Lu Guimin(路贵民).Acta Metallurgica Sinica(金属学报)[J],2002,38(9):956
[10]Zhao Z H,Cui J Z,Dong J.Journal of Materials Processing Technology[J],2007,182(1-3):185
[11]Zhang Qin(张勤),Zhang Junkai(张俊凯),Li Ying(厉英)et al.Journal of Wuhan University of Science and Technology(武汉科技大学学报)[J],2014,37(1):27
[12]Yao L,Hao H,Gu S W.Transactions of Nonferrous Metals Society of China[J],2010,20(2):388
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