1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China
Abstract：Electric current pulse (ECP) treatment was applied to steel during solidification process and its effect on the migration behavior of inclusions was investigated by observing and analyzing the morphology, quantity, size and composition of inclusions. The results show that under the influence of ECP treatment, the crystal nucleus falls off at the initial stage of solidification, which results in the formation of crystal rain. During the falling process of the crystal nucleus, the inclusions also migrate downward. With the increase of current density, the number of inclusions in upper and middle regions of ingots and the size of grain decrease. Compared with that without ECP treatment, it reduces the number and the area of inclusion in upper and middle regions of ingots by 46.9% and 35.6%, respectively, when the current density is 56.6 A/cm2 under the current experimental condition. For the steel with high requirement of inclusion content, applying ECP treatment to control the formation and migration of crystal rain during ingot solidification is an effective technology to remove inclusions in steel and improve ingot quality.
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2022, Vol. 32 
