2019 Volume 60 Issue 706 Pages 309-314
Macroscopic segregation occurs easily at the center of materials with large cross-sectional areas, such as blooms, billets, and ingots. Segregation affects the workability and certain other properties such as mechanical strength and corrosion resistance through phase transformation. Therefore, it is important to manufacture homogeneous materials by eliminating segregation. In this study, the influence of manufacturing conditions on the diffusion of segregation is examined. It was found that the diffusive behavior of some elements in the segregation part depended on the rolling ratio, which is defined as the ratio of the areas of the cast material and the rolled material. And it was possible to estimate diffusive behavior using a parameter including Ld/Hm, where Ld is the contact length and Hm is the mean thickness before and after rolling. In addition, from a comparison of conventional and heavy reduction rolling conditions, we suggested that the recrystallization affected the segregation diffusion behavior.