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The paper investigated the refinement effect on droplet size of Electroslag Remelting(ESR)Process by superimposing a transverse static magnetic field through physical simulation method.A transparent experimental model is built to visualize the ESR process under magnetic field,especially focusing on the formation and departure process of droplets on electrode tip.The results show that due to the interaction between alternating current and external transverse magnetic field,the resulting electromagnetic oscillation in the molten droplet and slag bath refined droplets remarkably,the higher the magnetic field intensity,the smaller the droplet size.However,there exists a suitable frequency of 10Hz for the current which will achieve an optimal effect of droplet’s dispersing and refinement.Based on the theory of electromagnetic separation,a new mechanism of removing nonmetallic inclusions in ESR process is proposed.By a simplified circuit model,the inclusion removal efficiency is calculated and it proves that the refinement of droplets under magnetic field could increase the removal efficiency of nonmetallic inclusions in ESR significantly.
The paper investigated the refinement effect on droplet size of Electroslag Remelting (ESR) Process by superimposing a transverse static magnetic field through physical simulation method. A transparent experimental model is built to visualize the ESR process under magnetic field, especially focusing on the formation and departure process of droplets on electrode tip. The results show that due to the interaction between alternating current and external transverse magnetic field, the resulting electromagnetic oscillation in the molten droplet and slag bath refined droplets remarkably, the higher the magnetic field intensity, the smaller the droplet size.However, there exists a suitable frequency of 10Hz for the current which will achieve an optimal effect of droplet’s dispersing and refining.Based on the theory of electromagnetic separation, a new mechanism of removing nonmetallic inclusions in ESR process is proposed.By a simplified (Simplified) circuit model, the inclusion removal efficiency is calculated a nd it proves that the refinement of droplets under magnetic field could increase the removal efficiency of nonmetallic inclusions in ESR significantly.