【摘要】 基于■350 mm圆坯结晶器生产304不锈钢的工艺参数，建立了三维圆坯结晶器电磁搅拌模型，研究了不同电流强度下M-EMS对圆坯结晶器内钢液流动、温度分布和凝固行为的影响，确定最佳搅拌作用的电流强度。结果表明，在施加电磁搅拌强度后，结晶器内钢液发生旋流运动，伴随搅拌时间产生周期性的偏心现象，且在凝固前沿处钢液切向速度随电流强度的增加而增大；旋流的钢液促使圆坯结晶器内钢液温度分布更加均匀，钢液高温区域扩大，M-EMS作用下的铸坯表面温度提高；在合适的电流强度作用下，提高钢液散热引起的凝固坯壳增加量大于钢液旋流冲刷引起的凝固坯壳减少量，致使凝固坯壳厚度增加，最终选取295 A的最优电流强度参数。更多还原

【Abstract】 Based on the process parameters of 304 stainless steel production by ■350 mm billet mold, a three-dimensional electromagnetic stirring model of billet mold was established. The effects of M-EMS on the flow, temperature distribution and solidification behavior of molten steel in billet mold under different current intensities were studied, and the current intensity for optimal stirring was obtained. The results show that after the application of electromagnetic stirring intensity, the molten steel in the mold undergoes swirling motion, which produces periodic eccentricity with the stirring time. The tangential velocity of the molten steel at the solidification front increases with the increase in current intensity. The swirling molten steel promotes a more uniform temperature distribution of molten steel in the billet mold, the high-temperature area of molten steel expands, and the surface temperature of the billet with M-EMS increases. With appropriate current intensity, the increase in solidified billet shell caused by increasing the heat dissipation of molten steel is greater than the decrease of solidified billet shell caused by swirl scouring of molten steel, resulting in the increase in solidified billet shell thickness, and finally the optimal current intensity parameter of 295 A was selected.更多还原