【作者】 姜东滨； 张立峰；

【Author】 JIANG Dongbin;Zhang Lifeng;School of Metallurgical and Ecological Engineering,University of Science & Technology Beijing;

【机构】 北京科技大学冶金与生态学院；

【摘要】 通过耦合多相凝固模型与电磁场的模型,研究方坯连铸凝固宏观偏析形成及电磁搅拌影响规律。研究结果表明铸坯中心偏析主要受末端电磁搅拌电流强度和液相穴宽度影响较大,而与两相区搅拌速度影响较小。当液相穴宽度为73 mm时,随着搅拌电流强度的增加,铸坯中心偏析连续降低。当液相穴宽度降低至61 mm时,相同搅拌电流强度条件下中心偏析改善明显,但在较大电流时,中心偏析反向上升,这是由于旋转流动作用下富集溶质向铸坯中心聚集和等轴晶粒的径向迁移造成。当液相穴宽度减小至43 mm时,电磁搅拌改善效果更为明显。液相穴宽度为25 mm时,铸坯中心偏析逐渐形成,电磁搅拌的影响较小。更多还原

【Abstract】 Coupling the multiphase solidification model with the electromagnetic model,the effect of F-EMS parameters on center segregation improvement in billet continuous casting were investigated.The results show that the stirring velocity is not the main factor influence center segregation improvement,which is more affected by current intensity and stirring pool width.Because solute transport is controlled by solidification rate as stirring pool width is 73 mm,center segregation declines continuously with current intensity increasing.As liquid pool width decreases to 61 mm,the center segregation could be improved more obviously by F-EMS.Due to the solute enrichment and liquid phase accumulation in the stirring zone,center segregation turns to rise reversely with higher current intensity and becomes more serious with liquid pool width further decreasing to 43 mm.As stirring pool width is 25 mm,positive segregation has already formed and the solute could still concentrate with weak stirring,leading to center segregation deterioration.更多还原