Abstract
This study investigates the constitutive equation and microstructure evolution of an experimental Fe–26.6Mn–9.8Al–1.0C lightweight steel at deformation temperatures of 850–1050 °C and strain rates of 0.01–5 s−1 via thermal–mechanical simulation. The flow stress curves of the steel are modified by considering the effects of friction and temperature rise. A high-temperature constitutive equation of the lightweight alloy is expressed using Arrhenius-type equation involving the Zener–Hollomon parameter, the constitutive equation based on peak stress and strain compensation (material parameters vary with different strain) were constructed, respectively, which can better predict the flow stress changes of the experimental steel during hot compression, the average absolute relative error (AARE) and R were calculated to be 5.6% and 0.98. DRX kinetic model of the experimental steel was also established, and the results show that the high temperatures and low strain rates are conducive to DRX. DRX is sensitive to thermal deformation temperatures and strain rates, but the sensitivity to temperatures is higher than that to strain rates. Deformation twin and dislocation slipping are the main deformation mechanisms in the experimental steel at the low deformation temperature of 850 °C. At the higher temperature of 1050 °C, the deformation mechanisms are dislocation slipping and deformation banding.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
The research reported in this paper is financially supported by the National Natural Science Foundation of China (Grant No. 51674004), National Natural Science Foundation Youth Foundation of China (Grant No. 51805002), Anhui Provincial Natural Science Research Key Program of Higher Education Institutions (Grant No. 2022AH051760), Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes, Tongling University (Grant No. TLXYCHR-O-21YB03).
Funding
This study was funded by the National Natural Science Foundation of China (Grant No. 51674004), National Natural Science Foundation Youth Foundation of China (Grant No. 51805002), Anhui Provincial Natural Science Research Key Program of Higher Education Institutions (Grant No. 2022AH051760), Key Laboratory of Construction Hydraulic Robots of Anhui Higher Education Institutes, Tongling University (Grant No. TLXYCHR-O-21YB03).
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Under supervision by JL and ZH, JS performed sample preparation, data analysis and calculations. PW performed sample preparation and structure fabrication. The first draft of the manuscript was written by JS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Sun, J., Li, J., Huang, Z. et al. Constitutive equation and microstructure evolution during isothermal compression of an Fe–26.6Mn–9.8Al–1.0C lightweight steel. Appl. Phys. A 129, 529 (2023). https://doi.org/10.1007/s00339-023-06812-w
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DOI: https://doi.org/10.1007/s00339-023-06812-w