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Estimation of probable maximum aspect ratio of MnS inclusions in non-quenched and tempered steel after isothermal compression

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Abstract

To clarify the deformation behavior of MnS inclusions in a non-quenched and tempered steel at three different positions (edge, 1/2 radius and center) in the cross-section of the billet in the course of hot rolling, isothermal compression experiments were performed under the deformation temperature range from 1073 to 1473 K, the reduction rates from 25% to 75% and the strain rates from 0.01 to 10 s−1. The variations of deformability features (i.e., aspect ratios, size distributions, and morphologies) of MnS inclusions with those isothermal compression parameters were revealed. The evaluation of the probable maximum aspect ratio of MnS inclusions at the three different positions in the cross-section of the billet after hot rolling was examined using the statistical analysis of extreme values. Results showed that the number densities of MnS inclusions at three different positions (edge, 1/2 radius and center) in the cross-section of the steel billet only fluctuated slightly when the deformation parameters varied in the isothermal compression, while the average inclusion aspect ratios in all cases generally have a negative correlation with the deformation temperature and positive correlations with the reduction ratio and the strain rate. Statistical analysis reveals that larger inclusions deform more easily during hot rolling. The effect of rolling temperature on the extreme value of the aspect ratio of inclusions is the smallest, while the effects of initial size, reduction ratio and strain rate are more significant.

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Acknowledgements

The present study was supported by the National Natural Science Foundation of China (Grant Nos. 52074198, 52374342 and U21A20113) and also supported by the Department of Science and Technology of Hubei Province (Grant No. 2023AFB603 and No. 2023DJC140).

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Authors and Affiliations

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

    Jun-yu Liu, Cheng-song Liu, Yong Wang, Hua Zhang & Hong-wei Ni

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Jun-yu Liu, Cheng-song Liu, Yong Wang, Hua Zhang & Hong-wei Ni

  3. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Jun-yu Liu, Cheng-song Liu, Yong Wang, Hua Zhang & Hong-wei Ni

  4. Henan Jiyuan Iron & Steel (Group) Co., Ltd., Jiyuan, 459000, Henan, China

    Rui-juan Bai, Wei Wang & Qing-bo Wang

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  1. Jun-yu Liu
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  2. Cheng-song Liu
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  3. Yong Wang
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Correspondence to Cheng-song Liu or Hong-wei Ni.

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Cheng-song Liu is a youth editorial board member for Journal of Iron and Steel Research International and was not involved in the editorial review or the decision to publish this article. On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Liu, Jy., Liu, Cs., Wang, Y. et al. Estimation of probable maximum aspect ratio of MnS inclusions in non-quenched and tempered steel after isothermal compression. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-024-01200-x

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  • DOI: https://doi.org/10.1007/s42243-024-01200-x

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