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Hot deformation behavior and processing map of low-alloy offshore steel

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Abstract

The hot deformation behavior of a low-alloy offshore steel was systematically investigated within the temperature range of 850–1150 °C and strain rate range of 0.01–10 s–1, via hot compression testing. The hot working equation, grain size model and recrystallization kinetic models of the steel were developed by fitting the experimental data. The results show that the decrease in Zener–Hollomon Z-parameter value (the increase in deformation temperature and the decrease in strain rate) is beneficial for the occurrence of dynamic recrystallization, and the grain size can be refined by increasing the Z-parameter value within the deformation range of dynamic recrystallization. However, when the Z-parameter value is higher than 3.43 × 1016, dynamic recrystallization will be difficult to occur within the range of experimental deformation conditions. Additionally, processing maps at different strains were constructed. According to the processing map and microstructural analysis, the optimal hot working conditions of the studied steel are within the temperature range of 1000–1100 °C and strain rate range of 0.1–1 s−1, and a complete recrystallization microstructure with fine homogeneous grains could be obtained.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51604241, 51771166 and 51871192) and Hebei Province Natural Science Foundation (Grant No. E2016203395), Qinhuangdao Research and Development Plan of Science and Technology (201602A014) and Open Research Program of National Engineering Research Center for Equipment and Technology of Cold Strip Rolling (NECSR-201503), the Iron and Steel Joint Foundation of Hebei Province (E2020402016) and Funding Project of Overseas Returnees from Hebei Province (C201806) and Open Topic of Key Laboratory of Material Forming and Structure Property Control from University of Science and Technology Liaoning (USTLKFSY201708).

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Authors and Affiliations

  1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, College of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei, China

    Shi-ping Xi, Xin-liang Gao, Wei Liu, Yan-lu Lu, Hui-cheng Tao & Yong-chang Zang

  2. College of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China

    Gui-qin Fu

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  1. Shi-ping Xi
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  2. Xin-liang Gao
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  3. Wei Liu
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Correspondence to Xin-liang Gao.

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Xi, Sp., Gao, Xl., Liu, W. et al. Hot deformation behavior and processing map of low-alloy offshore steel. J. Iron Steel Res. Int. 29, 474–483 (2022). https://doi.org/10.1007/s42243-021-00603-4

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