Effect of combined electromagnetic fields on surface quality and structure of a HDC casting 5182 Al alloy ingot

Qingfeng ZHU,Zhihao ZHAO,Yubo ZUO,Xiangjie WANG and Jianzhong CUI Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China

摘 要：5182 Al alloy ingots with the diameters of 100 mm are produced by conventional and combined electromagnetic fields （CEMF） horizontal direction chill （HDC） casting 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 conventional 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.

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