Rapidly Solidifed Steel Droplets with B and P Addition  

作　　者：Na Li Junwei Zhang Qian Xu Lulu Zhai Shengli Li Jiguang Li 

机构地区：[1]School of Material and Metallurgy,University of Science and Technology Liaoning [2]Tianjin Iron and Steel Group Co.,Ltd

出　　处：《Journal of Materials Science & Technology》2013年第10期995-998,共4页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China (No.51074210);the Open Foundation of Key Laboratory of Materials Forming and Microstructure & Properties Control,Colleges and Universities in Liaoning Province (USTLKL2012-01)

摘　　要：Low carbon steels with B and P additions were remelted by electromagnetic levitation and solidified in a vacuum drop tube. The droplet volumes were set to be 2 mm × 2 mm ×2 mm （TM） and 5 mm ×5 mm× 5 mm （FM）, respectively. The microstructure of rapidly solidified steel droplets （cooled in silicon oil） with P and both B and P addition was observed. The microstructures of B-bearing droplet samples were more uniform than those of B-free ones, for both TM and FM samples. The distribution of C and P along the diameter of each sample was detected. The well-distribution of C and P was detected in B-bearing droplet samples. So it could be deduced that B was also well distributed in the steels. It was B atoms that promoted the well-distribution of C and P, which further improved the uniformity of microstructure under the condition of rapid solidification. The micro-hardness of B- bearing samples was higher than that of B-free samples, and the hardening mechanism was discussed in detail.Low carbon steels with B and P additions were remelted by electromagnetic levitation and solidified in a vacuum drop tube. The droplet volumes were set to be 2 mm × 2 mm ×2 mm （TM） and 5 mm ×5 mm× 5 mm （FM）, respectively. The microstructure of rapidly solidified steel droplets （cooled in silicon oil） with P and both B and P addition was observed. The microstructures of B-bearing droplet samples were more uniform than those of B-free ones, for both TM and FM samples. The distribution of C and P along the diameter of each sample was detected. The well-distribution of C and P was detected in B-bearing droplet samples. So it could be deduced that B was also well distributed in the steels. It was B atoms that promoted the well-distribution of C and P, which further improved the uniformity of microstructure under the condition of rapid solidification. The micro-hardness of B- bearing samples was higher than that of B-free samples, and the hardening mechanism was discussed in detail.

关 键 词：Rapid solidification BORON PHOSPHORUS DROPLET Micro-hardness 

分 类 号：TG111[金属学及工艺—物理冶金]