多元合金激光增材制造凝固组织演变模拟  

Simulation of solidification microstructure evolution in laser addition manufacturing of multicomponent alloy

作　　者：齐海波[1,2] 张云浩 冯校飞 韩日宏 吴栋 QI Haibo;ZHANG Yunhao;FENG Xiaofei;HAN Rihong;WU Dong(Shijiazhuang Tiedao University,Shijiazhuang,050043,China;Key Laboratory of Hebei Transportation Engineering Materials,Shijiazhuang,050043,China;Institute of Metals Research,Chinese Academy of Sciences,Shenyang,110016,China)

机构地区：[1]石家庄铁道大学,石家庄050043 [2]河北省交通工程材料重点实验室,石家庄050043 [3]中国科学院金属研究所,沈阳110016

出　　处：《焊接学报》2020年第5期71-77,I0005,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51705345);河北省重点研发计划(18211813D);河北省自然科学基金资助项目(E2017210054);河北省教育厅青年拔尖资助项目(BJ2018034).

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.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 threedimensional molten pool and model for multi-element alloy solidification structure evolution was realized by selfdeveloped 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.

关 键 词：多元合金 激光增材制造 凝固组织 数值模拟 

分 类 号：TG401[金属学及工艺—焊接]