不同熔化速率下的电渣重熔过程数值模拟分析

电渣重熔能提高钢锭的质量，从而满足特种行业的需要，其过程伴随着复杂的物理现象，存在着磁流体流动、传热和传质以及电化学等多方面的影响。通过耦合电磁以及流动和温度方程对电渣重熔过程的三维瞬态进行了数学模拟，研究了熔化速率对重熔过程的影响。结果表明：电流密度、焦耳热和电磁力都随着熔化速率的增大而增大，当熔化速率由14.4 kg/h增加到27.0kg/h，电流密度、焦耳热和电磁力最大值的增大比例超过100%。随着熔化速率的增大，温度最大值有小幅的增加，而且速度最大值的增大幅度接近50%；金属熔池深度则由27 mm增大到38 mm，不利于保证铸坯的质量。

Numerical simulation analysis of electroslag remelting process for different melting rates

Electroslag remelting process can improve the quality of the ingot for special usage. Complex physical phenomena are involved in this process and the influence of the magnetic fluid flow, the heat and mass transfer, as well as the electrochemistry must be taken into account. By coupling the electromagnetic field, the flow field and the temperature field, a three-dimensional transient-state mathematical model has been developed to analyze the influence of melting rate on electroslag remelting process. The simulation results show that, with the increase of melting rate, the current density, joule heat and electromagnetic force become bigger, and the maximum value of field increases more than 100% when melting rate increases from 14.4 kg/h to 27.0 kg/h. With the increase of melting rate, the maximum value of temperature increases a little, while the maximum value of velocity increases about 50%, and the depth of metal melting pool increases from 27 mm to 38 mm, which is harmful to the ingot quality.