| 多元合金激光增材制造凝固组织演变模拟 |
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| 引用本文： | 齐海波,张云浩,冯校飞,韩日宏,吴栋.多元合金激光增材制造凝固组织演变模拟[J].焊接学报,2020,41(5):71-77. |
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| 作者姓名： | 齐海波 张云浩 冯校飞 韩日宏 吴栋 |
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| 作者单位： | 1.石家庄铁道大学，石家庄，050043 |
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| 基金项目： | 河北省重点研发计划;河北省自然科学基金;河北省教育厅青年拔尖资助项目;国家自然科学基金 |
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| 摘 要： | 针对多元合金激光熔覆过程，基于有限元方法和元胞自动机技术建立了多元合金激光熔覆熔池三维传热传质及凝固组织形貌演变模型，通过自行开发的宏微观耦合接口程序实现了三维熔池模型和多元合金凝固组织演变模型的耦合. 针对IN718激光熔覆过程中的传热传质和凝固组织演变过程进行了模拟，研究了基板初始晶粒尺寸、异质形核及多层熔覆扫描路径对熔覆层凝固组织形貌的影响机理，并对模拟结果进行了试验验证. 结果表明，模拟结果与实际物理过程吻合较好，所开发的耦合模型能够真实反映多元合金激光熔覆过程.
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| 关 键 词： | 多元合金 激光增材制造 凝固组织 数值模拟 |
| 收稿时间： | 2019-08-23 |
Simulation of solidification microstructure evolution in laser addition manufacturing of multicomponent alloy |
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| Affiliation: | 1.Shijiazhuang Tiedao University， Shijiazhuang, 050043, China2.Key Laboratory of Hebei Transportation Engineering Materials, Shijiazhuang, 050043, China3.Institute of Metals Research, Chinese Academy of Sciences, Shenyang, 110016, China |
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| Abstract: | For the process of laser cladding of multicomponent alloy, the model for heat and mass transfer of three-dimensional pool and solidification structure evolution were established based on the finite element method and cellular automata technology. The coupling of model for three-dimensional molten pool and model for multi-element alloy solidification structure evolution was realized by self-developed macro-micro coupling interface program. The heat and mass transfer and solidification structure evolution of IN718 laser cladding process were simulated. The effects of initial grain size, heterogeneous nucleation and scanning path of multilayer cladding on the solidification structure and morphology of cladding layer were investigated, and the simulation results were verified by experiments. The results showed that the simulation results were in good agreement with the actual physical process, and the developed coupling model truly reflected the laser cladding process of multicomponent alloys. |
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