5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields （CEMF） horizontal direction chill （HDC） cast- ing process. The effect of CEMF on the ingot surface...5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields （CEMF） horizontal direction chill （HDC） cast- ing process. The effect of CEMF on the ingot surface quality and floating grains is investigated. The results show that the CEMF is effective in reducing the segregation layer in both top and bottom sub-surfaces. Big floating grains with coarse dendrite arms mainly distribute in the crescent-shaped area near the bottom in the conven- tional HDC casting ingot. With the application of the CEMF, they disappear in the whole cross section of the HDC casting ingot and the equiaxed grains are significantly refined.展开更多
基金supported by the National Natural Science Foundation of China(Nos.51204053 and 51074048)Research Fund for the Doctoral Program of Higher Education of China(No.20090042120001)+2 种基金Central University Basic R&D Operating Expenses(No.N100409006)China Postdoctoral Science Foundation(No.20110491518)National Basic Research Program of China(973Program)(No.2012CB619506)
文摘5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields （CEMF） horizontal direction chill （HDC） cast- ing process. The effect of CEMF on the ingot surface quality and floating grains is investigated. The results show that the CEMF is effective in reducing the segregation layer in both top and bottom sub-surfaces. Big floating grains with coarse dendrite arms mainly distribute in the crescent-shaped area near the bottom in the conven- tional HDC casting ingot. With the application of the CEMF, they disappear in the whole cross section of the HDC casting ingot and the equiaxed grains are significantly refined.
