| Microstructures of electromagnetic casting and direct chill casting LY12 aluminum alloys |
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| 引用本文： | 曹志强,金俊泽,郝海,贾非. Microstructures of electromagnetic casting and direct chill casting LY12 aluminum alloys[J]. 中国有色金属学会会刊, 2003, 13(2) |
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| 作者姓名： | 曹志强 金俊泽 郝海 贾非 |
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| 作者单位： | Research Center of Foundry Engineering，Dalian University of Technology，Research Center of Foundry Engineering，Dalian University of Technology，Research Center of Foundry Engineering，Dalian University of Technology，Research Center of Foundry Engineering，Dalian University of Technology Dalian 116024，China，Dalian 116024，China，Dalian 116024，China，Dalian 116024，China |
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| 基金项目： | Projects ( 5 990 10 0 1，5 9995 44 2 )supportedbytheNationalNaturalScienceFoundationofChina，project (G19980 615 0 0 )supportedbythestatekeyFundamentalResearchandDevelopmentProgramofChina |
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| 摘 要： | 1 INTRODUCTIONElectromagneticcasting (EMC)isatechnologydevelopedbythecombinationofmagnetohy drodynamics (MHD )andcastingengineering[13] .TheEMCtechnologydependsontheelectromagneticforcetopreventthemetalfromtouchingthemold .Dependingontheinteractionofeddycurrentsinducedinthemetalandthemagneticfieldoftheinductor ,theliquidmetalcolumniskeptstable[4 6 ] .Thecon tactlesscastingofEMCmayeliminatetheliquidationbuild upsandfeathercrystals ,relievethescalpingop erationbeforethehotrollprocess …
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Microstructures of electromagnetic casting and direct chill casting LY12 aluminum alloys |
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| CAO Zhi qiang,JIN Jun ze,HAO Hai,JIA Fei. Microstructures of electromagnetic casting and direct chill casting LY12 aluminum alloys[J]. Transactions of Nonferrous Metals Society of China, 2003, 13(2) |
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| Authors: | CAO Zhi qiang JIN Jun ze HAO Hai JIA Fei |
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| Abstract: | LY12 aluminum alloys made by electromagnetic casting (EMC) and direct chill casting (DCC), were analyzed by optical microscope, differential scanning calorimetry, transmission electron microscope and X ray diffraction. It is found that the surface and subsurface quality of the ingot is improved largely due to the absence of an ingot mold, which is impossible to achieve with conventional DCC. It is also found that the intense forced convection can promote the fast superheat evacuation and break the dendrite arms, leading to the grain multiplication and the appearance of a fine equiaxed grains over the whole cross section. As a result, the hardness of EMC specimens increases one time than that from DCC in the as cast state. Even though after the solid solution treatment and the artificial aging, the DCC ingot still can not get the same hardness as EMC ones. |
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| Keywords: | electromagnetic casting continuous casting aluminum alloy microstructure hardness |
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