| “节点修正”FVM-CA方法熔积凝固组织模拟 |
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| 引用本文： | 赵静怡,李自力,王桂兰,张海鸥. “节点修正”FVM-CA方法熔积凝固组织模拟[J]. 焊接学报, 2013, 0(11): 37-40 |
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| 作者姓名： | 赵静怡 李自力 王桂兰 张海鸥 |
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| 作者单位： | 华中科技大学材料学院, 武汉 430074,华中科技大学软件学院, 武汉 430074,华中科技大学材料学院, 武汉 430074,华中科技大学机械学院, 武汉 430074 |
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| 基金项目： | 国家自然科学基金资助项目(51175203) |
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| 摘 要： | 基于Nastac模型建立了一种优化的元胞捕捉机制,即"节点修正"法元胞自动机(CA)模型.较传统的CA模型能够简便有效地模拟任意主轴方向的柱状晶生长;将其与有限体积法(finite volume method,FVM)的宏观温度场模拟相结合,构建了一种改进的FVM-CA宏微观耦合计算方法.用该改进模型对碳钢电弧熔积组织演变过程进行了模拟,并探讨了熔积速度对熔池枝晶间距及生长方向的影响.试验结果证明了计算模型的合理性,该工作将为熔积增材成形金属零件的组织预测与控制提供科学基础.
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| 关 键 词： | 有限体积法 自动元胞机 组织凝固模拟 宏微观耦合 晶粒生长 |
| 收稿时间： | 2013-04-24 |
FVM-CA simulation of grain growth during solidification using' node-based-correction'method |
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| ZHAO Jingyi,LI Zili,WANG Guilan and ZHAN Haiou. FVM-CA simulation of grain growth during solidification using' node-based-correction'method[J]. Transactions of The China Welding Institution, 2013, 0(11): 37-40 |
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| Authors: | ZHAO Jingyi LI Zili WANG Guilan ZHAN Haiou |
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| Affiliation: | School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China,School of Software Engineering, Huazhong University of Science and Technology, Wuhan 430074, China,School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China and School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | Based on the Nastac model,a new capture mechanism,named node-based-correction method,was proposed to improve cellular automaton (CA) technique in the simulation of grain growth during solidification process with arbitrary crystallographic orientations.By coupling with the finite volume method (finite volume method,FVM),a FVM-CA simulation model was put forward and applied to the simulation of microstructure evolution of solidification during the arc deposition.The influences of the deposition rate on dendrite arm spacing and the growth direction were also discussed.Experiments were carried out to verify the validity of the numerical model.This research will lay the theoretical foundation of the prediction and control of microstructure in additive manufacturing. |
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| Keywords: | finite volume method cellular automaton solidification simulation macro-micro coupling grain growth |
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