The preparation and rolling of the semi-solid slurry 1Cr18Ni9Ti stainlesssteel were researched. The experimental results show that when stirred for 2-3 min under the giventest condition, the semi-solid slurry with about 50 percent-60 percent (volume fraction) solid andthe spherical primary austenitic grains in the size of 100-200 mu m can be obtained, and it is easyto be discharged from the bottom little hole of the stirring chamber. The semi-solid slurry of1Cr18Ni9Ti stainless steel can be rolled into the given plate successfully. However, the solid phaseand liquid phase are easily separated in the rolling process, so that the solid primary austeniticgrains are concentrated in the center and the liquid phase is near the edge of the rolled plate. Thestrengths of the plate rolled in the semi-solid state are higher than that of the traditionallyrepeated hot-rolled plate of 1Cr18Ni9Ti stainless steel.
Weimin Mao, Aimin Zhao, Dong Yun, Leping Zhang, and Xueyou ZhongMaterials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China
In this paper, spring steel-60Si2Mn and stainless steel-1Cr18Ni9Ti were rolled one pass in the semi-solid state. The microstructural evolution during rolling of the steels with different solid fraction was investigated. The experimental results showed that the manner of liquid and solid phases flowing and deforming was different. During rolling, most of solid phases remained in the center of the rolled specimens, while liquid phase flowed to the edge, which resulted in the macrosegregation of liquid and solid phases. Only the amount of solid fraction reached a certain value, were the solid phases deformed and flattened.
Renbo SONG, Yonglin KANG, Jianlin SUN, Xiongfei YANG, Aimin ZHAO and Weimin MAODepartment of Metal Forming, University of Science and Technology Beijing, Beijing 100083, China
