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Effect of Strain Rate on the Bainitic Transformation in Fe-C-Mn-Si Medium-Carbon Bainitic Steels

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Abstract

The effect of strain rate on the kinetics of the bainitic transformation in a Fe-C-Mn-Si medium-carbon bainitic steel was investigated by dilatometry, metallography, and X-ray diffraction. The results indicate that the bainitic transformation is affected by the strain rate. The bainitic transformation is significantly promoted by deformation at a low strain rate of 0.01 s−1, and the amount of bainite increases further when the strain rate increases to 0.1 s−1. However, as the strain rate increases further to 1.0 and 5.0 s−1, the extent to which deformation promotes the bainitic transformation decreases, and the amount of bainitic transformation is smaller than that at low strain rates. The amount of bainite tends to be constant with increasing strain rate from 1.0 to 5.0 s−1. In addition, the volume fraction of retained austenite shows the same trend as the amount of bainite, indicating that chemical stabilization plays a key role in determining the amount of retained austenite. Moreover, the strain rate has no significant effect on the bainite morphology.

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Acknowledgment

The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (NSFC) (Nos. 51874216 and 51704217) and the Major Projects of Technology Innovation of Hubei Province (No. 2017AAA116).

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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

    Guanghui Chen, Guang Xu, Haijiang Hu & Xiangliang Wan

  2. Department of Materials Science and Engineering, McMaster University, 1280 Main St. W, Hamilton, L8S4L7, Canada

    Hatem S. Zurob

Authors
  1. Guanghui Chen
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  2. Guang Xu
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  3. Hatem S. Zurob
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  4. Haijiang Hu
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  5. Xiangliang Wan
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Correspondence to Guang Xu.

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Manuscript submitted July 11, 2018.

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Chen, G., Xu, G., Zurob, H.S. et al. Effect of Strain Rate on the Bainitic Transformation in Fe-C-Mn-Si Medium-Carbon Bainitic Steels. Metall Mater Trans A 50, 573–580 (2019). https://doi.org/10.1007/s11661-018-5051-z

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  • DOI: https://doi.org/10.1007/s11661-018-5051-z

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