Abstract
The mechanical properties of the sample and the stability of retained austenite were studied by designing two kinds of ultra-fine bainitic steel with different heat treatment methods (austempering above and below Ms (martensite start temperature)), which were subjected to tensile tests at 20 and 450 °C, respectively. The results show that compared to room temperature (20 °C) tensile properties, the uniform elongation of the sample at high temperature (450 °C) significantly decreased. Specifically, the uniform elongation of the sample austempered above Ms decreased from 8.0% to 3.5%, and the sample austempered below Ms decreased from 10.9% to 3.1%. Additionally, the tensile strength of the sample austempered above Ms significantly decreased (from 1281 to 912 MPa), and the sample austempered below Ms slightly decreased (from 1010 to 974 MPa). This was due to the high carbon content (1.60 wt.%), high mechanical stability, low thermal stability for the retained austenite of the sample austempered below Ms. Besides, the retained austenite decomposed at high temperatures, the carbon content and transformation driving force were significantly reduced, the transformation rate increased, and the phase transformation content reduced.
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Acknowledgements
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (52071238), Leading Innovation and Entrepreneurship Team in Zhejiang Province (2021R01020), the Key Research and Development Program of Hubei Province (2021BAA057), Science and Technology Program of Guangxi Province (AA22068080), and the 111 Project. The authors show thanks for the technical support provided by Analysis and Test Center of Wuhan University of Science and Technology.
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He, Tt., Hu, F., Wang, K. et al. High-temperature stability of retained austenite and plastic deformation mechanism of ultra-fine bainitic steel isothermally treated below Ms. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-023-01151-9
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DOI: https://doi.org/10.1007/s42243-023-01151-9