Current, Magnetic Field and Joule Heating in Electroslag Remelting Processes
Current, Magnetic Field and Joule Heating in Electroslag Remelting Processes
复制标题
电渣重熔过程中的电流、磁场和焦耳热
DOI：
10.2355/isijinternational.52.1289
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发表时间：
2012-01-01
影响因子：
1.8
通讯作者：
Tsukihashi, Fumitaka
中科院分区：
文献类型：
--
作者：
Li, Baokuan;Wang, Fang;Tsukihashi, Fumitaka
建立了电渣重熔过程中电极、炉渣和钢锭系统的电流密度、磁场、电磁力和焦耳加热的三维有限元模型。特别是利用磁矢量势法在电磁场模型中考虑了集肤效应。仿真结果与实验结果吻合较好。数值结果表明：集肤效应增强，电流最大值出现在电极和钢锭表面，电磁力最大值出现在炉渣中电极附近的上表面，焦耳加热最大值出现在电极和炉渣界面处。参数化研究表明，当电流频率大于40 Hz时，在电极和钢锭内部产生涡流。随着电极浸泡深度的增加或渣帽厚度的减小，渣内焦耳加热最大值增大。
A three-dimensional (3D) finite element model was developed to simulate the current density, magnetic field, electromagnetic force and Joule heating for a system of electrode, slag and ingot in electroslag remelting processes. Especially, the skin effect is taken into account in electromagnetic field model by magnetic vector potential method. Simulated magnetic flux density is compared with experiment and obtained a good agreement. Numerical results show that the skin effect becomes strong and the maximum current occurs at the surface of electrode and ingot, the maximum of electromagnetic force is at the upper surface nearby the electrode in the slag and the maximum of Joule heating is at the interface of electrode and slag. The parametric study shows that the eddy current flow occurs in interior of electrode and ingot if the current frequency is more than 40 Hz. With the increasing of electrode immersion depth or decreasing of slag cap thickness, the maximum of the Joule heating in slag increases.