Abstract
Fine carbide particles are desirable for balancing the hardness-toughness tradeoff of high-speed steels (HSSs). The conventional processing method, i.e., carbide decomposition and spheroidization followed by heavy deformation, usually requires high heating temperature and large plastic strain for the carbide refinement. The present work has proposed a novel thermal–mechanical processing route, which employs a high-temperature pre-deformation step instead of the post-deformation. The results show that pre-deformation is both thermodynamically and kinetically favorable for the following carbide decomposition and spheroidization owing to the introduction of dislocations and stacking faults into primary carbides. Compared with the conventional method, the new route produces smaller carbides and causes higher hardness and wear resistance. This finding may provide an alternate pathway for the reduction of heating temperature and plastic strain while guaranteeing the microstructural homogeneity of HSSs.
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The authors gratefully acknowledge the support from the Key Research Program of Jiangsu Province of China (Project Number BE2022144).
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Zhou, X., Sun, C., Zhang, W. et al. A Novel Thermal–Mechanical Processing Route for Improving the Microstructural Homogeneity of High-Speed Steel. Metall Mater Trans A 54, 1042–1053 (2023). https://doi.org/10.1007/s11661-023-06977-2
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DOI: https://doi.org/10.1007/s11661-023-06977-2