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| Effects of Electromagnetic Stirring Frequency on the Solidification Structure of Pb–Sn Hypereutectic Alloy |
| GUO Jianshe1, ZHAO Qian1, HOU Xiaoguang2, FANG Canfeng1, ZHANG Xingguo1 |
1.School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023
2.Shanghai Baosteel Group, Shanghai 201900 |
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Cite this article:
GUO Jianshe ZHAO Qian HOU Xiaoguang FANG Canfeng ZHANG Xingguo. Effects of Electromagnetic Stirring Frequency on the Solidification Structure of Pb–Sn Hypereutectic Alloy. Chin J Mater Res, 2012, 26(3): 267-273.
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Abstract The effects of electromagnetic stirring frequency on solidification structure and macro composition segregation of Pb–80%Sn hypereutectic alloy cast ingot were investigated and compared with that without magnetic field. The results show that the spiral magnetic field can make the distribution of solute and temperature field more uniform than that of rotating magnetic field for the formation of larger zone stirring in the ingot. For a fixed excitation current, the grains size of primary phase decreases with the increasing of frequency, and an optimal effect can be obtained when the frequency reaches 13 Hz for rotating magnetic field and 10 Hz for spiral magnetic field. The grains sizes can reduce to 142.5 μm and 140.6 μm from 247.3 μm in the absence of magnetic field respectively. However, the solidification structure will coarsen and non-homogenize as the frequency increases. The composition segregation can be the minimum when the frequency is 13 Hz for both rotating and spiral magnetic field, which are reduced from 9.71% under no magnetic field to 1.14% and 0.34% severally.
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Received: 01 March 2012
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| Fund: Supported by National Natural Science Foundation of China No.50875031 and Baosteel High-Tech Projects No.10K029ECES. |
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