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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.
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. microstructure of rapidly solidified steel droplets (cooled in silicon oil) with P and both B and P addition was observed. 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. 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 .I was 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. Micro-hardness of Bbearing samples was higher than that of B-free samples, and the hardening mechanism was discussed in detail.