| 铝合金挤压铸造过程微观孔洞形成的建模与仿真 |
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| 引用本文： | 韩志强,李金玺,杨文,赵海东,柳百成.铝合金挤压铸造过程微观孔洞形成的建模与仿真[J].金属学报,2011,47(1):7-16. |
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| 作者姓名： | 韩志强 李金玺 杨文 赵海东 柳百成 |
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| 作者单位： | 1) 清华大学机械工程系, 先进成形制造教育部重点实验室, 北京 100084
2) 华南理工大学机械与汽车工程学院, 广州 510640
3) 清华大学汽车工程系, 汽车安全与节能国家重点实验室, 北京 100084 |
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| 基金项目： | 国家自然科学基金项目50675113和50875143资助 |
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| 摘 要： | 基于挤压铸造过程微观孔洞的形成机理,建立了模拟铝合金挤压铸造过程微观孔洞的数学模型.该模型考虑了传热、凝固收缩、补缩流动、压力传递、氢(H)的再分配等因素,通过计算凝固收缩导致的补缩流动与压力降低,以及挤压过程的压力传递,获得挤压铸造过程糊状区的压力分布,结合微观孔洞形成条件及H的守恒方程,计算微观孔洞的体积分数.对不...
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| 关 键 词： | 铝合金 挤压铸造 微观孔洞 建模与仿真 |
| 收稿时间： | 2010-06-30 |
| 修稿时间： | 2010-10-26 |
MODELING AND SIMULATION ON MICROPOROSITY FORMED DURING SQUEEZE CASTING OF ALUMINUM ALLOY |
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| HAN Zhiqiang,LI Jinxi ,YANG Wen ,ZHAO Haidong ,LIU Baicheng Key Laboratory for Advanced Materials Processing Technology.MODELING AND SIMULATION ON MICROPOROSITY FORMED DURING SQUEEZE CASTING OF ALUMINUM ALLOY[J].Acta Metallurgica Sinica,2011,47(1):7-16. |
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| Authors: | HAN Zhiqiang LI Jinxi YANG Wen ZHAO Haidong LIU Baicheng Key Laboratory for Advanced Materials Processing Technology |
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| Affiliation: | 1) Key Laboratory for Advanced Materials Processing Technology (Ministry of Education), Department of Mechanical Engineering, Tsinghua University, Beijing 100084
2) School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640
3) State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University, Beijing 100084 |
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| Abstract: | A mathematical model for simulating the microporosity in squeeze casting of aluminum alloy has been developed, in which the heat transfer, solidification shrinkage, feeding flow, pressure transfer, and hydrogen conservation were taken into account. The shrinkage induced flow and the pressure drop in the mushy zone were calculated by solving continuity and momentum equations. A mechanical model was solved for obtaining the pressure transferred into the central area of the casting. By coupling the pressure drop with the pressure transferred into the central area, the pressure distribution in the mushy zone was calculated. Based on the hydrogen conservation equation, the microporosity volume fraction was calculated by referring to the pressure value in the mushy zone. The squeeze casting processes of aluminum alloy under different process conditions were simulated and the simulation results were compared with experimental results. It was shown that the simulation results agree well with the experimental results, and the increases in applied pressure and mould temperature tend to reduce the microporosity in the castings. |
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| Keywords: | aluminum alloy squeeze casting microporosity modeling and simulation |
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