(西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要: 依据磁流体动力学理论，运用ANSYS有限元分析软件对真空自耗电弧熔炼过程电弧区流场进行数值模拟。结果表明：在阳极熔池表面熔炼电弧的温度最高，且其附近电弧区压力随着径向距离的增大而增大，而在熔炼电极表面附近，电弧区压力随着径向距离的增加而减小；弧间距的减小不仅使电弧区的流体流动速度减小，而且还导致环路流动范围减小且向坩埚壁靠近。当电极直径为280 mm，熔炼电压为30 V时，理想熔炼弧长可控制在25~40 mm。
关键字: 钛合金；真空自耗电弧熔炼；等离子体；流场
VAR process for titanium alloy
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:A numerical simulation of arc region fluid field was done by ANSYS finite element analytical software during vacuum are remelting process, which is on the basis of magnetohydrodynamics theory. The results show that the maximum temperature of remelting arc is located on the surface of anode molten pool. The pressure increases with radial distance near anode molten pool surface, but it decreases when radial distance increases near remelting electrode surface. The flow velocity of fluid decreases when the arc length decreases, and the flow region also decreases and moves closer to the crucible wall. The remelting arc length should be controlled between 25 and 40 mm in the event that the electrode diameter is 280 mm and the arc voltage is 30 V.
Key words: titanium alloy; vacuum arc remelting; plasma; flow field
