钛合金冷坩埚连续熔铸与定向凝固电磁场研究

Electromagnetic Field of Continuous Melting and Directional Solidification of Ti Alloys in Cold Crucible

利用ANSYS软件建立冷坩埚连续熔铸过程的数学模型,计算在近矩形冷坩埚连续熔铸过程中冷坩埚内的磁感应强度,分析负载和电流强度变化对钛合金连续熔铸与定向凝固过程冷坩埚内磁感应强度的影响。结果表明:钛合金物料的加入并没有影响轴向磁感应强度的空间分布趋势;轴向磁感应强度在感应线圈与坩埚所包围的区域内聚集分布,且在感应线圈内壁中点处其强度达到最大值,并随着与内壁距离的增加逐渐衰减;磁感应强度随着输入电流的增加线性增大。

A model with a near rectangular cold crucible system was based by applying ANSYS software. The magnetic intensity distributions inside the crucible were simulated during cold crucible continuous melting and directional solidification. The effects of titanium alloys and input current on the magnetic intensity distributions in the crucible were analyzed. It is found that adding titanium alloys doesnt affect the axial magnetic intensity distributions inside the crucible. The distributions of magnetic field are non - uniform across the defined calculation region. The magnetic field mainly acts on the slit area of the crucible, especially the density of electromagnetic force of the area surrounded by the coil and the crucible apparently higher than other positions. After the Ti6A14V ingots are placed in the cold crucible, the original lines of magnetic force of hollow area in the crucible turns to concentrate on the surface of the ingots and aggregates in the region of ingot＇s melting and melt hump＇ s electromagnetic confinement shaping. And the increase of input current causes the increase of magnetic intensity.