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In Situ Observation of the MnS Precipitation Behavior in High-Sulfur Microalloyed Steel Under Different Cooling Rates

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Abstract

In situ observation of the precipitation behavior of MnS in a high-sulfur microalloyed steel has been conducted by means of a confocal laser scanning microscopy (CLSM) with cooling rates increased from 50 to 400 °C/min. Differential scanning calorimetry analysis and thermodynamic calculation were carried out prior to and following the CLSM experiments using scanning electron microscopy (SEM) and X-ray energy-dispersive spectrometer. The results suggested that the initial MnS precipitate temperature decreased from 1440.0 °C to 1429.6 °C and the final temperature reduced from 1413.7 °C to 1381.6 °C as the cooling rate increased from 50 to 400 °C/min in the CLSM test. Three typical MnS morphologies of small angular, globular and larger dendrite cluster MnS were observed in the melting surface. Furthermore, with an increase in the supersaturation of MnS and a significant reduction of the local solidification time when the cooling rate increased from 50 to 400 °C/min, the large clusters MnS at interdendritic regions became thinner and more small angular MnS precipitates formed at dendrite crystals.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (No. 51904345), Guangxi Scientific Technology Project (AD 18281073), Hunan Scientific Technology Projects (2018RS3022, 2018WK2051), Opening Foundation of the State Key Laboratory of Advanced Metallurgy (KF19-04), and Hunan Provincial Innovation Foundation for Postgraduate (CX2018B089). Jie Zeng and Chenyang Zhu contributed equally to this work.

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Author notes

  1. Jie Zeng and Chenyang Zhu contributed equally to this work.

Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, P.R. China

    Jie Zeng, Chenyang Zhu & Wanlin Wang

  2. National Center for International Research of Clean Metallurgy, Central South University, Changsha, 410083, P.R. China

    Wanlin Wang

  3. The Institute of Research of Iron and Steel, Shasteel, Zhangjiagang, 215625, P.R. China

    Xia Li

Authors
  1. Jie Zeng
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  2. Chenyang Zhu
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  3. Wanlin Wang
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  4. Xia Li
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Correspondence to Wanlin Wang.

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Manuscript submitted January 21, 2020.

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Zeng, J., Zhu, C., Wang, W. et al. In Situ Observation of the MnS Precipitation Behavior in High-Sulfur Microalloyed Steel Under Different Cooling Rates. Metall Mater Trans B 51, 2522–2531 (2020). https://doi.org/10.1007/s11663-020-01946-1

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  • DOI: https://doi.org/10.1007/s11663-020-01946-1

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