| 脉冲磁致振荡下纯铝凝固磁场与流场分布的数值模拟 |
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| 引用本文： | 刘芳,张璐云.脉冲磁致振荡下纯铝凝固磁场与流场分布的数值模拟[J].铸造,2012,61(3):285-290. |
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| 作者姓名： | 刘芳 张璐云 |
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| 作者单位： | 1. 上海理工大学材料科学与工程学院,上海200093;上海大学上海市现代冶金与材料制备重点实验室,上海200072
2. 上海理工大学机械工程学院,上海,200093 |
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| 基金项目： | 上海市现代冶金与材料制备重点实验室开放课题(SELF-2009-03);上海市教委科研创新(一般)项目(09YZ225) |
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| 摘 要： | 脉冲磁致振荡可以细化金属晶粒,为了研究其作用机理,采用ANSYS有限元模拟软件对脉冲磁致振荡下纯铝凝固磁场与流场分布进行了数值模拟.模拟结果显示,由于电磁趋肤效应,线圈中脉冲电流只在熔体表面感应产生电磁力,且随时间出现指向内部的压力与指向外部的拉力交替变化,沿径向有指向熔体顶部与底部交替变化.交变电磁力可以振荡熔体表面率先析出的晶核而使之游离,增大熔体形核率.同时感应电磁力迫使熔体产生流动,会利于晶核的均匀分布与温度场、浓度场的均匀化.
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| 关 键 词： | 脉冲磁致振荡 ANSYS 磁场 流场 数值模拟 |
Numerical Simulation of Magnetic Field and Flow Field Distributions During Pure Aluminum Solidification Under Pulse Magneto-Oscillation |
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| LIU Fang
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ZHANG Lu-yun.Numerical Simulation of Magnetic Field and Flow Field Distributions During Pure Aluminum Solidification Under Pulse Magneto-Oscillation[J].Foundry,2012,61(3):285-290. |
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| Authors: | LIU Fang ZHANG Lu-yun |
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| Affiliation: | 1.School of Material Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China; 2.Shanghai Key Laboratory of Modern Metallurgy and Materials Processing,Shanghai University,Shanghai 200072,China; 3.School of Mechanical Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China) |
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| Abstract: | The metal grain can be refined under pulse magneto-oscillation(PMO).In order to study its mechanism,the numerical simulation of the magnetic field and flow field distributions during pure aluminum solidification under PMO has been carried out with ANSYS.Because of the skin effect,the pulse current in the coil generates electromagnetic force in the surface melt.The magnetic pulling and pressure force can be generated alternatively,and in radial direction,the magnetic force appears with direction to top and bottom in turn.The free nucleus separated from the melt surface will be oscillated to drift away to increase the nucleation rate.Meanwhile the melt is forced to flow,which is beneficial to the uniform distribution of the nucleus,the temperature field and the concentration field. |
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| Keywords: | pulse magneto-oscillation ANSYS magnetic field flow field numerical simulation |
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