Precipitation and Growth Behaviors of BN Inclusions in Molten Steel

Ya-nan Chen; Yan-ping Bao; Min Wang; Xiao-feng Cai; Lin-jing Wang; Li-hua Zhao

doi:10.2355/isijinternational.54.2215

Regular Article

Precipitation and Growth Behaviors of BN Inclusions in Molten Steel

Ya-nan Chen, Yan-ping Bao , Min Wang, Xiao-feng Cai, Lin-jing Wang, Li-hua Zhao

Author information

Ya-nan Chen
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
Yan-ping Bao Corresponding author
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
Min Wang
National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing
Xiao-feng Cai
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
Lin-jing Wang
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
Li-hua Zhao
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Room 1012, Metallurgical Building of University of Science and Technology in Beijing

Keywords: BN, inclusion, morphology, precipitation, growth model

JOURNAL OPEN ACCESS FULL-TEXT HTML

2014 Volume 54 Issue 10 Pages 2215-2220

DOI https://doi.org/10.2355/isijinternational.54.2215

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Abstract

The existing form of BN particles, a new environmentally friendly free cutting particle, is very important in steel for the purpose of optimizing cutting performance. However, precipitation and growth behaviors of BN inclusions in steel are not very clear until now. In this research, the morphologies of BN inclusions in steel were discussed and the formation mechanisms of BN inclusions were proposed. First, the precipitation behaviors of BN inclusions in steel have been investigated by theoretical calculation using Factsage software. Then, the actual three-dimensional morphology of BN inclusions and composite inclusions were observed in laboratory. Moreover, Growth model of BN inclusions via diffusion and collision are established employing Matlab, respectively. The results revealed that BN precipitate greatly in the solidification end and BN can nucleate heterogeneously on the surface of nucleation site (such as Al₂O₃, spherical MnS) besides homogeneous nucleation. The size of the BN ranged from 1 to 2 um after the diffusion growth, and then BN particles and other particles in steel, relying on its own Brownian motion, collided and agglomerated with each other, thereby formed a large cluster-like inclusion. The results agreed well with the simulated results based on BN growth model.

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