Abstract
In this study, a high-carbon nano-bainitic GCr15Si1Mo bearing steel was investigated. Specifically, the effects of content and size of undissolved carbides on the microstructure and transformation kinetics of nano-bainite were analyzed. The results demonstrated that after prolonged austempering at low temperatures, the mixed microstructure composed of nano-bainite (NB), undissolved carbides (UC), and retained austenite (RA) was obtained in GCr15SiMo steel. When the experimental steel was austenitized at 900 °C, the undissolved carbides gradually dissolved until reaching a stable state with increasing holding time. Furthermore, at the same austempering temperature, despite different volume fractions of undissolved carbides in the substrate, the volume fractions of nano-bainite in the final microstructures remained essentially the same. Moreover, the higher the content of undissolved carbides in steel, the faster the transformation rate of nano-bainite and the shorter the total transformation time.
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Acknowledgements
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 52001105 and 52122410), the Hebei Natural Science Foundation (Nos. E2022402107, E2023203259 and E2020402101), the Science and Technology Project of Hebei Education Department (No. BJ2021012), and the Central Guidance for Local Science and Technology Development Funding Project (No. 236Z1021G).
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Wang, YH., Sun, HQ., Feng, WJ. et al. Notably Accelerated Nano-Bainite Transformation via Increasing Undissolved Carbides Content on GCr15Si1Mo Bearing Steel. Acta Metall. Sin. (Engl. Lett.) 37, 703–712 (2024). https://doi.org/10.1007/s40195-023-01652-2
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DOI: https://doi.org/10.1007/s40195-023-01652-2