Rapidly Solidifed Steel Droplets with B and P Addition
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第10期
论文作者：Na Li Junwei Zhang Qian Xu Lulu Zhai Shengli Li Jiguang Li
文章页码：995 - 998
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℃ and P along the diameter of each sample was detected.The well-distribution of℃ 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℃ and P,which further improved the uniformity of microstructure under the condition of rapid solidification.The micro-hardness of Bbearing samples was higher than that of B-free samples,and the hardening mechanism was discussed in detail.
Na Li1，Junwei Zhang1，Qian Xu2，Lulu Zhai1，Shengli Li1，Jiguang Li1
1. School of Material and Metallurgy,University of Science and Technology Liaoning2. Tianjin Iron and Steel Group Co.,Ltd
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℃ and P along the diameter of each sample was detected.The well-distribution of℃ 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℃ and P,which further improved the uniformity of microstructure under the condition of rapid solidification.The micro-hardness of Bbearing samples was higher than that of B-free samples,and the hardening mechanism was discussed in detail.
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