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Effect of Cooling Rate on the Precipitation Behavior of Carbonitride in Microalloyed Steel Slab

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Abstract

In the continuous casting of the microalloyed steel, the slab surface transversal cracking could be prevented through the control of the slab surface microstructure, which correlates with the precipitation behavior of carbonitrides in the microalloyed steel. Therefore, the cooling rate is the key factor to determine the precipitation behavior of carbonitrides. This article used confocal laser scanning microscopy to study the effect of different cooling rates on the precipitation behavior of the carbonitrides in the microalloyed steel slab. When the cooling rate is less than 3 K·s−1, the precipitates in the steel are coarse, growing out along the austenite grain boundaries, and form a chain-like distribution. These precipitates seriously reduced the hot ductility of slab. Quantitative study between the cooling rate and the precipitation behavior of carbonitrides in microalloyed steel also has been developed. The results of this study could be used to improve the understanding of the slab surface microstructure controlling to enhance the hot ductility of the slab and avoid the surface crack of the slab.

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Acknowledgments

The work was supported by Baoshan Iron and Steel Research Institute, and the authors want to express their gratitude to Dr. Gao and Dr. Chengquan Wang for their help in finishing the CLSM and TEM experiments.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, P.R. China

    Fanjun Ma (PhD), Guanghua Wen (Professor) & ** Tang (Professor)

  2. Baoshan Iron and Steel Co., Ltd., Shanghai, 201900, P.R. China

    Guodong Xu (Principal Engineer ) & Feng Mei (Engineer)

  3. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, P.R. China

    Fanjun Ma (PhD) & Wanlin Wang (Shenghua Professor)

Authors
  1. Fanjun Ma
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  2. Guanghua Wen
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  3. ** Tang
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  4. Guodong Xu
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  5. Feng Mei
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  6. Wanlin Wang
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Corresponding author

Correspondence to Wanlin Wang.

Additional information

Manuscript submitted August 23, 2010.

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Ma, F., Wen, G., Tang, P. et al. Effect of Cooling Rate on the Precipitation Behavior of Carbonitride in Microalloyed Steel Slab. Metall Mater Trans B 42, 81–86 (2011). https://doi.org/10.1007/s11663-010-9454-5

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  • DOI: https://doi.org/10.1007/s11663-010-9454-5

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