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In situ observation of the effect of AIN particles on bainitic transformation in a carbide-free medium carbon steel

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Abstract

The bainitic transformation of the steels with different mass fractions of N, ∼0.002% and 0.021%, was observed in situ by using high-temperature metalloscope. Micrometer- and nanometer-sized aluminum nitride (AlN) particles were found in the steel with 0.021% N. Grain boundaries, the interior of the grains, and AlN particles were used as initial nucleation sites of bainitic ferrite, and bainitic ferrite subunits served as new nucleation sites to induce secondary nucleation. The lengthening rate of bainitic ferrite varied at different nucleation sites, which was controlled by the repeated nucleation and growth of bainitic subunits. The AlN particles not only provided several nucleation sites, but also increased the autocatalytic effect on the transformation, further shortening the incubation period, promoting the bainitic transformation, and refining the bainitic microstructure.

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Acknowledgements

This work was financially supported by the Research Project of Hebei Provincial Department of Education (No. QN2018144) and the National Natural Science Foundation of China (No. 51831008).

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Authors and Affiliations

  1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China

    Xiao-jie Zhao & Fu-cheng Zhang

  2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao, 066004, China

    Zhi-nan Yang

Authors
  1. Xiao-jie Zhao
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  2. Zhi-nan Yang
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  3. Fu-cheng Zhang
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Correspondence to Zhi-nan Yang or Fu-cheng Zhang.

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Zhao, Xj., Yang, Zn. & Zhang, Fc. In situ observation of the effect of AIN particles on bainitic transformation in a carbide-free medium carbon steel. Int J Miner Metall Mater 27, 620–629 (2020). https://doi.org/10.1007/s12613-019-1911-9

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  • DOI: https://doi.org/10.1007/s12613-019-1911-9

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