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Flow characterization and microstructure evolution of high-temperature steel F92 during hot deformation

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Abstract

This study is dedicated to investigate the flow characteristics and processability of forged F92 stainless steel based on the results of isothermal compression test at temperatures of 1023–1423 K and strain rate of 0.01–10 s−1. Arrhenius constitutive equation was selected to analyze the flow stress curve. On account of the energy dissipation and instability criterion, the hot working map was constructed to determine the optimal deformation parameters, and their influence on microstructure evolution was also revealed. The trend of the flow stress curves were described using the strain factor, while with the increase in strain, the flow stress curve shows three types of changing trends, namely flow softening, hardening behavior and dynamic equilibrium between hardening and softening. The constitutive equation makes the flow stress predictable under all deformation conditions. Combined with the hot processing map and EBSD observation, the main deformation mechanism is analyzed as the dynamic recrystallization and flow localization in different deformation zones, and the best processing window of the steel was determined as the conditions of strain rate of 0.01 ~ 0.1 s−1, temperature range of 1223–1323 K.

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Acknowledgements

The authors would like to express their sincere thanks for the research grants supported by the National Natural Science Foundation of China (Grant No.51805002), Project supported by the Research Fund of Key Laboratory of advanced metal material green preparation and surface technology (AHUT), Ministry of Education, China (Grant No.GFST2020KF03) and Postdoctoral Fund from Jiangsu Province and Anhui Province (Grant No. 2019K208 and No. 2019B343).

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Authors and Affiliations

  1. School of Innovative Education, Anhui University of Technology, Ma’anshan, 243002, China

    Congzhong Wen & Hui Pan

  2. School of Metallurgical Engineering, Anhui University of Technology, Ma’anshan, 243002, China

    Jinghu Li

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  1. Congzhong Wen
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Wen, C., Pan, H. & Li, J. Flow characterization and microstructure evolution of high-temperature steel F92 during hot deformation. Appl. Phys. A 128, 949 (2022). https://doi.org/10.1007/s00339-022-06033-7

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