Effects of low-frequency electromagnetic field on the surface quality of 7050 aluminum alloy ingots during the hot-top casting process |
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| Authors: | Xiang-jie Wang Jian-zhong Cui Yu-bo Zuo Zhi-hao Zhao Hai-tao Zhang |
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| Affiliation: | (1) Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang, 110004, People’s Republic of China |
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| Abstract: | To improve the quality of 7050 aluminum alloy ingots, low-frequency electromagnetic (LFE) field was applied during the conventional
hot-top casting process. Macrostructures and microstructures of the ingots by the conventional and LFE hot-top casting processes
were studied. The experimental results show that when the LFE field is turn off during the hot-top casting process, cold folding
appears, and the as-cast structure becomes very coarse. Additionally, the thickness of the shell zone is much thinner during
the low-frequency electromagnetic hot-top casting process than that during the conventional hot-top casting process. Some
reasons for low-frequency electromagnetic field improving the surface quality, refining the structure of the ingot, and minimizing
the thickness of the shell zone have been studied. |
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| Keywords: | |
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