<i>In situ</i> observation of the effect of AlN particles on bainitic transformation in a carbide-free medium carbon steel

Xiao-jie Zhao; Zhi-nan Yang; Fu-cheng Zhang

doi:10.1007/s12613-019-1911-9

Volume 27 Issue 5

May 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(5): 620-629

Xiao-jie Zhao, Zhi-nan Yang, and Fu-cheng Zhang, In situ observation of the effect of AlN particles on bainitic transformation in a carbide-free medium carbon steel, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 620-629. https://doi.org/10.1007/s12613-019-1911-9

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Xiao-jie Zhao, Zhi-nan Yang, and Fu-cheng Zhang, In situ observation of the effect of AlN particles on bainitic transformation in a carbide-free medium carbon steel, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 620-629. https://doi.org/10.1007/s12613-019-1911-9

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Research Article

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

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Corresponding author:
Fu-cheng Zhang E-mail: zfc@ysu.edu.cn
Received: 18 July 2019; Revised: 15 September 2019; Accepted: 18 September 2019; Available online: 20 February 2020

Abstract

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.
- bainitic steel;
- In situ observation;
- phase transformation;
- aluminum nitride

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