Effect of mechanical stirring on the solidification structure of medium-carbon steel

The effect of various stirring parameters on the solidification structure of medium-carbon steel during the initial stage of solidification was studied in this paper.The results showed that with different stirring processing time,the macrostructure was refined and equiaxed crystal also increased,as well as columnar crystal reduced and the proportion of equiaxed grains enhanced with the increasing stirring time;by changing the depth inserted into liquid steel,it can be seen that the proportion of equiaxed crystal zone significantly increased,grain size was refined and distributed more evenly with the increase of insertion depth;By changing stirring rate,it was inferred that the slower the stirring rate,the larger the proportion of equiaxed grains.The mechanism of these phenomena were also analyzed.