(西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要: 采用ANSYS10.0软件建立电磁搅拌条件下真空自耗电弧熔炼过程三维电磁场数学模型，计算电流密度和磁场强度，并对比分析搅拌磁场对电磁力的影响。结果表明：电流沿坩埚壁向下流动，并在铸锭与坩埚的接触部位转为横向流动，在铸锭表面横向电流最大；随着熔炼的进行，铸锭上部自感磁场基本不变，下部的自感磁场强度减小；搅拌磁场的添加使得铸锭表面产生水平旋转洛伦兹力，且磁感应强度和功率损失随电流频率的增大而增大。
关键字: 真空自耗电弧熔炼；电磁场；电磁力；数值模拟
vacuum arc remelting process
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:3-D numerical simulations of electromagnetic field during vacuum arc remelting (VAR) were made by ANSYS software to calculate the remelting current and magnetic field, and the stirring magnetic field on the magnetic force was analyzed. The results show that current flows down crucible wall and turns transversely via the surface of the ingot, where the currents are the largest in the horizontal direction. Magnetic field induced by remelting current is almost the same at the ingot surface, but decreases at the bottom of the ingot during the remelting process. Magnetic flux and the power loss induced by stirring coils increase with the current frequency increasing. The Lorentz force with stirring coils can circumrotate at the ingot surface.
Key words: vacuum arc remelting; electromagnetic field; Lorentz forces; numerical simulation
