• CN：11-2187/TH
• ISSN：0577-6686

• 材料科学与工程 •

外加高频磁场下电弧快速成形过程的电磁-流体耦合数值模拟

1. 1. 南华大学机械工程学院 衡阳 421001;
2. 华中科技大学机械科学与工程学院 武汉 430074;
3. 华中科技大学材料科学与工程学院 武汉 430074
• 出版日期:2016-02-15 发布日期:2016-02-15
• 作者简介:柏兴旺(通信作者),男,1982年出生,博士,讲师。主要研究方向为金属增材制造过程的工艺设备与数值模拟。E-mail：pancard@126.com;张海鸥,男,1955年出生,博士,教授,博士研究生导师。主要研究方向为航空航天零件的增材制造。E-mail：zholab@mail.hust.edu.cn
• 基金资助:
国家自然科学基金资助项目(51505210,51374113)

Electromagneto-fluid Coupling Simulation of Arc Rapid Prototyping Process with External High-frequency Magnetic Field

BAI Xingwang1, ZHANG Haiou2, ZHOU Xiangman2, WANG Guilan3

1. 1. School of Mechanical Engineering, University of South China, Hengyang 421001;
2. School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074;
3. School of Material Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074
• Online:2016-02-15 Published:2016-02-15

Abstract: External electromagnetic field is an effective tool to improve the microstructure and properties of the components fabricated by arc rapid prototyping. To reveal the effect mechanism of high-frequency magnetic field on the heat transfer, convection and shape of weld pool, the coupling simulation of electromagnetic calculation by finite element method and fluid analysis by finite volume method is used, 3D models are developed for the analyses of electromagnetic field, temperature field and fluid flow field. The distributions of electromagnetic force and heat in workpiece and weld pool are investigated; the dynamic deformation of weld pool surface is calculated taking into account electromagnetic force, surface tension, arc pressure and droplet impingement. The temperature and flow fields of weld pool are compared between the cases with and without external magnetic field, thereby predicting the effect of high-frequency magnetic field on the microstructure and weld pool shape. The results indicate that single-vortex rotary convection is formed in the section perpendicular to welding direction when applying high-frequency transversal magnetic field. Convection carrying high-temperature metal imposes a tangential impingement on the bottom of melt pool, which melts dendrites and leads to refined grain. The melt pool profile slopes to the far side of coil, causing larger weld bead width. The simulation results have been confirmed by metallographic examination and macrograph of bead profile.