| 电磁搅拌作用下铝合金凝固组织的数值模拟 |
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| 引用本文： | 张衬新,张志峰,徐骏.电磁搅拌作用下铝合金凝固组织的数值模拟[J].铸造技术,2012,33(3):280-284. |
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| 作者姓名： | 张衬新 张志峰 徐骏 |
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| 作者单位： | 北京有色金属研究总院先进控制凝固与加工成型工程技术研究中心,北京,100088 |
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| 摘 要： | 建立了有限元(Finite Element)和元胞自动机法(Cellular Automaton)相结合的宏微观耦合的CA-FE模型,实现了电磁搅拌作用下Al-5％Cu合金凝固组织的数值模拟.该模型利用ANSYS软件计算电磁力,利用有限差分法计算宏观流场和温度场.在微观计算中,采用基于高斯分布的连续形核模型,并采用KGT生长模型计算枝晶尖端生长速率.模拟和实验结果表明,施加电磁搅拌后,铝合金的温度场均匀,冷却速率加快,利于组织细化.
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| 关 键 词： | 电磁搅拌 元胞自动机法 有限元 Al-5％Cu合金 形核 高斯分布 KGT模型 |
Numerical Simulation on Solidification Structure of Aluminum Alloy under Electromagnetic Stirring |
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| ZHANG Chen-xin
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ZHANG Zhi-feng
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XU Jun.Numerical Simulation on Solidification Structure of Aluminum Alloy under Electromagnetic Stirring[J].Foundry Technology,2012,33(3):280-284. |
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| Authors: | ZHANG Chen-xin ZHANG Zhi-feng XU Jun |
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| Affiliation: | (Advanced Cast and Processing Engineering Center,General Research Institute for Nonferrous Metals,Beijing 100088,China) |
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| Abstract: | A CA-FE model based on finite element and cellular automaton method,coupling a macro-micro-scopic temperature field and flow field analysis under electromagnetic stirring,was developed.The dynamic evolution of solidification grain structure of Al-5wt%Cu alloy were presented successfully.The magnetic forces,influencing flow field and temperature field of the melt,were calculated with ANSYS 10.0 solfware.The Gaussian distribution was chosen to deal with nucleation events both on the mold wall and in the bulk melt.The KGT(Kurz-Giovanola-Trivedi) model,based on the calculated temperature field,was adopted to evaluate the growth velocity of a dendrite tip.Both the computational and experimental results show that grain refinement is improved remarkably under electromagnetic stirring. |
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| Keywords: | electromagnetic stirring cellular automaton method finite element Al-5%Cu alloy nucleation gaussian distribution KGT model |
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