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Comprehensive Analysis of the Effect of Ausforming on the Martensite Start Temperature in a Fe-C-Mn-Si Medium-Carbon High-Strength Bainite Steel

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Abstract

The comprehensive effect of strain and ausforming temperature on the martensite start temperature (MS) of a medium-carbon bainite steel was investigated by thermal simulation, optical microscope, scanning electron microscope, etc. It is already known that small strain increases the MS, while larger strain decreases the MS. However, the effect of ausforming temperature on the MS has not been reported and clarified. In this study, the concepts of critical strain (εc) and saturated strain (εs) are proposed. The MS at the critical strain is equal to the MS of the nondeformed specimen. The saturation strain, which is first observed, is the strain value, and the MS does not further decrease with the increasing strain. The results show that the MS depends on the strain amount of ausforming but is not affected by the ausforming temperature. Moreover, with the increase of strain amount and ausforming temperature, the length of the martensite laths decreases. In addition, the hardness of the specimen increases with the increase of the ausforming strain amount, whereas the ausforming temperature has little effect on the hardness.

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Acknowledgments

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant Nos. 51874216 and 51704217), the Major Projects of Technology Innovation of Hubei Province (Grant No. 2017AAA116), the Science and Technology Project of Wuhan (2018010402011187), the Hebei Joint Research Fund for Iron and Steel (E2018318013), the Youth Foundation of Wuhan University of Science and Technology (2015XZ002), the State Key Laboratory Science Foundation for Youths (2016QN10), and the State Scholarship Fund of China Scholarship Council.

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Junyu Tian, Guanghui Chen, Yaowen Xu & Guang Xu

  2. School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong, NSW, 2522, Australia

    Zhengyi Jiang

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  1. Junyu Tian
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  2. Guanghui Chen
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Correspondence to Yaowen Xu or Guang Xu.

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Manuscript submitted February 22, 2019.

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Tian, J., Chen, G., Xu, Y. et al. Comprehensive Analysis of the Effect of Ausforming on the Martensite Start Temperature in a Fe-C-Mn-Si Medium-Carbon High-Strength Bainite Steel. Metall Mater Trans A 50, 4541–4549 (2019). https://doi.org/10.1007/s11661-019-05376-w

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