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Microstructural Refinement of Hot-Rolled Steels via Ferrite Dynamic Recovery and Recrystallization

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Abstract

The present study tries to refine the microstructure of hot-rolled C-Mn steels via ferrite dynamic recovery or recrystallization. A total of 1.5 wt.% Al is added to C-Mn steel (1.5Al steel) to retain a certain amount of ferrite at high temperatures so that ferrite dynamic recovery or recrystallization occurs during the hot rolling process. 0.022 wt.% Nb and 0.018 wt.% Ti are further added (1.5Al-NbTi steel). The results show that ferrite dynamic recrystallization occurs entirely during the hot rolling process of the 1.5Al steel, but the microstructure is not refined. Ferrite dynamic recrystallization is suppressed by adding Nb and Ti elements, owing to the pinning effect of NbC and TiC precipitates. A dynamically recovered microstructure containing subgrains with a volume fraction of 29.7% is formed in the 1.5Al-NbTi steel, and the size of subgrains ranges from 1 to 4 μm. Some refined ferrite grains surrounded by high-angle grain boundaries of 2 to 5 μm also form due to ferrite dynamic recrystallization. Moreover, adding 1.5 wt.% Al reduces the yield strength from 291 ± 1 (C-Mn steel) to 246 ± 2 MPa. Furthermore, adding Nb and Ti improves the yield strength to 349 ± 3 MPa (1.5Al-NbTi steel). This work indicates that refining the microstructure of hot-rolled steels is feasible by ferrite dynamic recovery and dynamic recrystallization.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51904072 and 51905189).

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Authors and Affiliations

  1. School of Iron and Steel, Soochow University, No. 8, Jixue Road, Xiangcheng District, Suzhou, 215021, China

    Xinjun Shen, Baojun Wang, Long Chen & Zijian Wang

  2. State Key Laboratory of Rolling and Automation, Northeastern University, No. 11, Lane 3, Wenhua Road, Heping District, Shenyang, 110819, China

    Dezhi Li & Guodong Wang

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Shen, X., Wang, B., Chen, L. et al. Microstructural Refinement of Hot-Rolled Steels via Ferrite Dynamic Recovery and Recrystallization. J. of Materi Eng and Perform 32, 10898–10909 (2023). https://doi.org/10.1007/s11665-023-07895-5

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