| Coupled macro-micro modeling for prediction of grain structure of Al alloy |
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| 作者姓名： | 许庆彦 冯伟明 柳百成 |
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| 作者单位： | DepartmentofMechanicalEngineering,TsinghuaUniversity,Beijing100084,China |
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| 基金项目： | the Significant Project of NSF of China，the National Significant Fundamental Research Project of MOST of China，清华大学校科研和教改项目 |
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| 摘 要： | A 3D stochastic modeling was presented to simulate the dendritic grains during solidification process of aluminum alloy. Shape functions were proposed in 2D and 3D to describe equiaxed dendritic shape. A growth model was presented to describe the growth of a nucleated grain and the capturing of the neighboring cells. On growing,each grain continues to capture the nearest neighboring cells to form the final grain shape. If a neighboring cell has been captured by other grains, the growth along this direction stops, which can reflect the grains impingement phenomenon occurring in solidification process. 2D and 3D calculations were performed to simulate the evolution of equiaxed dendritic grains. In order to verify the modeling results, step-shaped sample castings were cast in sand mold. The microstructure in various positions of the sample was observed. In addition the quantitative metallographic analysis also has been done to evaluate the grain size. Experimental and numerical results agree well.
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| 关 键 词： | 铝合金 晶体结构 预报 数值模拟 显微结构 |
Coupled macro-micro modeling for prediction of grain structure of Al alloy |
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| XU Qing yan,FENG Wei ming,LIU Bai cheng.Coupled macro-micro modeling for prediction of grain structure of Al alloy[J].Transactions of Nonferrous Metals Society of China,2004,14(1):71-77. |
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| Authors: | XU Qing yan FENG Wei ming LIU Bai cheng |
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| Abstract: | A 3D stochastic modeling was presented to simulate the dendritic grains during solidification process of aluminum alloy. Shape functions were proposed in 2D and 3D to describe equiaxed dendritic shape. A growth model was presented to describe the growth of a nucleated grain and the capturing of the neighboring cells. On growing,each grain continues to capture the nearest neighboring cells to form the final grain shape. If a neighboring cell has been captured by other grains, the growth along this direction stops, which can reflect the grains impingement phenomenon occurring in solidification process. 2D and 3D calculations were performed to simulate the evolution of equiaxed dendritic grains. In order to verify the modeling results, step-shaped sample castings were cast in sand mold. The microstructure in various positions of the sample was observed. In addition the quantitative metallographic analysis also has been done to evaluate the grain size. Experimental and numerical results agree well. |
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| Keywords: | Al alloy stochastic modeling microstructure simulation equiaxed dendritic grain |
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