过共晶Ti-Si合金熔体电磁定向凝固过程实验和数值模拟  

Experiment and Numerical Simulation of Electromagnetic Directional Solidification Process of Hypereutectic Ti-Si Alloy Melt

作　　者：王均鹏 马文会[1,2,3] 朱奎松 刑爱民 吕国强[1,2,3] WANG Junpeng;MA Wenhui;ZHU Kuisong;XING Aimin;LYU Guoqiang(State Key Laboratory of Complex Nonferrous Metal Resources CleanUtilization,Kunming University of Science and Technology,Kunming 650093,China;National Engineering Laboratory for Vacuum Metallurgy,Kunming Universityof Technology,Kunming 650093,China;Faculty of Metallurgical and Energy Engineering,Kunming University ofScience and Technology,Kunming 650093,China;Panzhihua University,Panzhihua,Sichuan 617000,China;YunnanNengtou Chemical Co.,Ltd,Kunming 650093,China)

机构地区：[1]昆明理工大学省部共建复杂有色金属资源清洁利用国家重点实验室,云南昆明650093 [2]昆明理工大学真空冶金国家工程实验室,云南昆明650093 [3]昆明理工大学冶金与能源工程学院,云南昆明650093 [4]攀枝花学院,四川攀枝花617000 [5]云南能投化工有限责任公司,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2021年第4期1-10,共10页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金联合基金项目(U1137601);云南省重大科技专项项目(202002AB080002);四川省应用基础研究项目(2021YJ0548)。

摘　　要：通过建立电磁场-热场-流场多物理场耦合数学模型,采用实验和COMSOL Multiphysics 5.4商业软件研究了Ti-89 wt.%Si合金熔体在电磁感应定向凝固过程中的不同线圈功率、电磁频率和下拉速率下Ti-Si合金熔体的流动行为,及其对初晶硅相电磁分离的影响规律.研究表明:电流频率为15kHz时,熔体的平均流动速度最大,分离效果较好;线圈功率为5.4kW、固相分数为0.50时,熔体的最大流速为0.55m/s,硅富集层的含量达到95.84%.此外,增大下拉速率会导致熔体的平均流速减小以及凝固前沿吸收硅原子的时间变短,从而导致硅相富集效果变差,不利于硅相与合金的分离,下拉速率从10μm/s增加到50μm/s,硅富集层中硅含量从93.96%降低至88.04%.By establishing the electromagnetic field–thermal field–flow field multi-physics coupling mathematical model,the flow behavior of Ti-89 wt.%Si alloy melt under different coil power,electromagnetic frequency and pull-down rates during electromagnetic induction directional solidification was experimentally studied and simulated by COMSOL Multiphysics 5.4 software,and the influence of electromagnetic separation on primary silicon phase was studied.The results showed that when the current frequency was 15kHz,the average velocity of the melt reached the maximum,and the separation effect was improved.When the coil power was 5.4 kWand the solid fraction was 0.50,the maximum melt flow rate was 0.55 m/s,and the content of silicon enrichment layer reached 95.84%.In addition,increasing the pull-down rates would lead to the decrease of the average velocity of the melt and the shorter time of absorbing silicon atoms at the solidification front,which would lead to the poor enrichment effect of silicon phase and was not conducive to the separation of silicon phase and alloy.The pull-down rate increased from 10μm/s to 50μm/s,and the silicon content in the silicon enrichment layer decreased from 93.96%to 88.04%.

关 键 词：流场 Ti-Si合金 合金熔体 定向凝固 数值模拟 合金凝固过程 

分 类 号：TG166.5[金属学及工艺—热处理] O743.2[金属学及工艺—金属学]