T型导电结晶器电渣重熔空心钢锭过程的数值模拟

基于新开发的电渣重熔空心钢锭技术,建立了渣池和空心钢锭的三维准稳态数学模型.利用商业软件ANSYS模拟并得到了非导电和导电结晶器工况下,电渣重熔空心钢锭过程的电磁场、流场与温度场.计算结果表明:导电结晶器工况下,渣池的电流密度和焦耳热最大值均出现在T型结晶器的导电段部分,导电结晶器附近的熔池流动速度较快,渣池的温度场更为均匀,金属熔池形状更为浅平.导电结晶器在交换电极时持续保持渣池和金属熔池温度,能够避免渣池温度迅速下降而导致靠近结晶器壁的钢水迅速凝固而出现渣沟,可大大提高钢锭的凝固质量和表面质量.

Numerical Simulation of Electroslag Remelting Process of Hollow Ingot with T-shape Current Supplying Mold

A three dimensional quasi-steady state mathematical model of the slag bath and hollow ingot has been established based on the newly developed electroslag remelting (ESR) technology for hollow ingot manufacture. The electromagnetic， flow and temperature fields during the electroslag remelting hollow ingot process with and without the current supplying mold (CSM) have been simulated using commercial software ANSYS. Computational results showed that the maximum current density and joule heat of the slag bath were obtained in the conductive section of T-shaped CSM， where the fluid flow velocity was much faster and the temperature field of the slag bath was more uniform， and the metal pool shape was shallower. The CSM can keep slag bath and metal pool temperature constantly during the exchange of electrodes， which avoided the rapid solidification of liquid metal near the mold wall to generated slag ditchs when the slag bath temperature drops rapidly. The solidification quality and surface quality of hollow ingots were thus greatly improved.