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Effect of Undercooling and Austenitic Grain Size on Bainitic Transformation in an Fe–C–Mn–Si Superbainite Steel

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Abstract

Superbainite steel is a new high strength steel, widely used in mechanical machinery, structure, bridge engineering etc. The effects of transformation and austenization temperatures on bainitic transformation in an Fe–C–Mn–Si superbainite steel were investigated by the combination of high temperature metallography and dilatometry. The experimental results indicate that the overall kinetics of bainite transformation is promoted by higher austenization temperature and lower isothermal transformation temperature. In conclusion, the nucleation of bainite nuclei of the steel under current study is mainly controlled by carbon diffusion, whereas the growth of bainite nuclei is dominated by displacive mechanism. Moreover, isothermal transformation temperature has a far more significant effect on bainitic transformation than austenization temperature.

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Acknowledgments

The authors gratefully acknowledge financial supports from the National Natural Science Foundation of China (NSFC) (No. 51274154), the National High Technology Research and Development Program of China (No. 2012AA03A504), the State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group) and key project of the Hubei Education Committee (No. 20121101).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, Wuhan, 430081, China

    Mingxing Zhou, Guang Xu & Haijiang Hu

  2. State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group), Baoshan, Shanghai, 201900, China

    Mingxing Zhou & Li Wang

  3. Faculty of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Mingxing Zhou, Guang Xu & Haijiang Hu

Authors
  1. Mingxing Zhou
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  2. Guang Xu
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  3. Li Wang
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  4. Haijiang Hu
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Corresponding author

Correspondence to Guang Xu.

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Zhou, M., Xu, G., Wang, L. et al. Effect of Undercooling and Austenitic Grain Size on Bainitic Transformation in an Fe–C–Mn–Si Superbainite Steel. Trans Indian Inst Met 69, 693–698 (2016). https://doi.org/10.1007/s12666-015-0541-9

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  • DOI: https://doi.org/10.1007/s12666-015-0541-9

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