Enhancement of removing inclusions from liquid melt film during the ESR process assisted by a static magnetic field

Abstract

Magnetic-controlled Electroslag Remelting (MC-ESR) process has been proposed to improve the inclusion removal efficiency in recent years. In this study, the effects of transverse static magnetic field (TSMF) on liquid melting film (LMF) and inclusion removal during this period in ESR process of GCr15 steel were studied by a series of MC-ESR experiments. The thickness of the characteristic position of LMF was reduced by 27.2%∼80.5% due to the accelerated dynamic process (LMF aggregating to form droplet and droplet falling) after applying a 65mT TSMF. In addition, the kinetic conditions for inclusion removal in LMF were also enhanced by the TSMF, leading to decrease in the number and size of inclusions in LMF. A numerical simulation of the inclusion migration in LMF was then carried out to verify the experimental results to some extent.