高频电磁场作用下矩形软接触结晶器内金属液面行为的实验研究  

EXPERIMENTAL STUDY ON MENISCUS BEHAVIOR IN RECTANGULAR SOFT-CONTACT MOLD UNDER HIGH FREQUENCY ELECTROMAGNETIC FIELDS

作　　者：王恩刚[1] 邓安元[1] 赫冀成[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110004

出　　处：《金属学报》2006年第4期411-414,共4页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划项目2001AA337040;辽宁省青年人才基金项目2005221004资助

摘　　要：利用Sn-Pb—Bi合金研究了高频磁场作用下262 mm×84 mm矩形软接触结晶器内的金属液面行为．结果表明, 金属液面的形状在软接触结晶器的切缝、分瓣体、角部以及宽面和窄面等处存在明显的不均匀性;在角部和切缝处金属液面凸起较大．通过减少角部切缝、周向上不均匀布置切缝的措施,可以改善金属液面变化的不均匀性．当金属初始液位处于线圈高度的中心偏上位置时,高频磁场作用下的金属液面凸起较高,三相点下移较深,且弯月面变形越平直．将液面控制在位于线圈中心偏上位置附近,可达到节约电能和提高铸坯表面质量的目的．实验结果还表明,增加电源功率可显著提高金属液面的高度,弯月面凸起增强, 但功率过高时,金属液面波动加剧．不同材质和结构的结晶器对应不同的最佳功率范围．The behavior of melt metal meniscus in a 262 mm×84 mm rectangular soft-contact mold under high frequency electromagnetic fields was investigated by using Sn-Pb-Bi alloy. The experiment results show that the meniscus is inhomogeneous in slits, segments, and at corners in the wide and narrow faces. The meniscus distortion is larger in front of slits and at mold corners. With less slits near the mold corners and non-uniform slits distribution along the wide and narrow faces, the inhomogeneity of meniscus distortion can be improved. The meniscus height is higher and the downward depth of three-phase point is lager while the free surface level locates little up or in the vicinity of the center of coil, therefore, the meniscus level in mold should locates between the coil center and the top of mold in casting operation to save energy and improve billet surface quality. With electric power increasing, the meniscus is enhanced, but with excessive power the meniscus fluctuation become more tempestuous. The optimal power is different to different mold structures.

关 键 词：连铸 软接触结晶器 高频电磁场 弯月面行为 

分 类 号：TG249.7[金属学及工艺—铸造] TG113.22