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| 基于CA模拟焊缝凝固过程枝晶生长的分析 |
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魏艳红1,2, 占小红1, 董志波2, 马瑞2, 王勇3,4
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1.南京航空航天大学, 材料科学与技术学院, 南京 210016;2.哈尔滨工业大学, 现代焊接生产技术国家重点实验室, 哈尔滨 150001;3.
1. 南京航空航天大学, 材料科学与技术学院, 南京 210016;4.
2. 哈尔滨工业大学, 现代焊接生产技术国家重点实验室, 哈尔滨 150001
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| 摘要: |
| 将元胞自动机方法用于焊缝金属凝固组织演变的模拟中,不仅为焊缝微观组织演变的数值模拟开辟了一种新的途径,同时也有助于研究焊接接头组织并依此优化工艺来提高焊件质量.文中研究了焊缝凝固过程中的溶质扩散问题,构建了基于元胞自动机的焊缝枝晶生长速度模型,在此基础上进行了焊缝中心等轴晶和熔池边缘柱状晶生长的模拟.初步计算了焊缝中心等轴晶和熔池边缘柱状晶的生长形态,计算结果明显再现了二次、三次枝晶的生长及竞争生长等微观现象.结果表明,元胞自动机方法是研究和模拟焊缝微观组织的有效手段之一。 |
| 关键词: 焊缝凝固 晶粒生长 数值模拟 元胞自动机 |
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| 基金项目:国家自然科学基金资助项目(50775112) |
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| Simulation of microstructure during weld solidification based on cellular automaton |
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WEI Yanhong1,2, ZHAN Xiaohong1, DONG Zhibo2, MA Rui2, WANG Yong3,4
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1.College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;2.The State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China;3.
1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;4.
2. The State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, China
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| Abstract: |
| The cellular automaton(CA) method has been successfully applied to simulate the microstructure evolution of welding solidification process, which is a powerful tool for simulating microstructure transformation of weld joint and helps to understand microstructure development so as to optimize process parameters and improve the quality of weldment.Solute diffusion during grain growing process in weld solidification is analyzed.A dendritic grain growth model based on CA method is developed to simulate the growths of the equiaxed grain in the center of the melt pool and the columnar grain near to HAZ, the grain morphologies of them are presented as the results of primary simulation, and the simulation results reproduce the growth of the secondary arms and the tertiary arms as well as competitive growing.The results show that the CA method is one of the effective ways to study and simulate the weld microstructure. |
| Key words: weld solidification dendritic grain growth numerical simulation cellular automaton |
