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Investigation on Microstructural Delamination and Compositional Segregation in Flange Steel with a High Stretch Ratio

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Abstract

In order to reveal the formation mechanism of microstructural delamination in flange steel during punching, the microstructural characteristics of flange steels with 0.064, 0.085, and 0.101 wt% carbon contents were analyzed by an optical microscope, optical emission spectrometer, metal in situ analyzer, and electron probe microanalyzer. It was found that microstructural delamination occurred due to C and Mn segregation, especially the former. The intensive segregation degree of C was dependent on its relatively smaller partition coefficient. Moreover, the segregation degree gradually decreased with the decreasing carbon content. And the increased segregations of elements except carbon were related to the coupling effect between different alloying elements. Furthermore, C and Mn were prone to segregate at the 1/4th position along the transverse direction of the casting slab; hence, almost no segregation was noticed at the edge of the casting slab. The homogenization treatment had a substantial effect on the elimination of C segregation; however, Mn segregation was relatively hard to be removed.

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Acknowledgements

The authors gratefully acknowledge the financial supports from the financial supports from Post-doctoral Innovative Research Post of Hubei Province, the National Natural Science Foundation of China (NSFC) (Nos. 51874216 and 51704217), the Major Projects of Technology Innovation of Hubei Province (2017AAA116) and Hebei Joint Research Fund for Iron and Steel (E2018318013).

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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

    Wen Liang, Qing Yuan, Sheng Liu & Guang Xu

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

    Wen Liang, Qing Yuan, Sheng Liu & Guang Xu

  3. Hot Rolling Products Research Development, Wuhan Branch of Baosteel Central Research Institute, Wuhan, 430080, China

    Wen Liang

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  1. Wen Liang
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  2. Qing Yuan
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  3. Sheng Liu
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  4. Guang Xu
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Correspondence to Qing Yuan.

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Liang, W., Yuan, Q., Liu, S. et al. Investigation on Microstructural Delamination and Compositional Segregation in Flange Steel with a High Stretch Ratio. Met. Mater. Int. 27, 1587–1598 (2021). https://doi.org/10.1007/s12540-019-00551-5

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  • DOI: https://doi.org/10.1007/s12540-019-00551-5

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