| Cite this article as: |
Wei Liu, You-hui Jiang, Hui Guo, Yue Zhang, Ai-min Zhao, and Yao Huang, Mechanical properties and wear resistance of ultrafine bainitic steel under low austempering temperature, Int. J. Miner. Metall. Mater., 27(2020), No. 4, pp. 483-493. https://doi.org/10.1007/s12613-019-1916-4
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The mechanical properties and wear resistance of the ultrafine bainitic steel austempered at various temperatures were investigated. Scanning electron microscopy (SEM) and X-ray diffraction were used to analyze the microstructure. The worn surfaces were observed via laser scanning confocal microscopy and SEM. Results indicated that, under low austempering temperatures, the mechanical properties differed, and the wear resistance remained basically unchanged. The tensile strength of the samples was above 1800 MPa, but only one sample austempered at 230°C had an elongation of more than 10%. The weight loss of samples was approximately linear with the cycles of wear and nonlinear with the loads. The samples showed little difference in wear resistance at different isothermal temperatures, whereas the thickness of their deformed layers varied greatly. The results are related to the initial hardness of the sample and the stability of the retained austenite. Meanwhile, the experimental results showed that the effect of austempering temperature on the wear resistance of ultrafine bainitic steel can be neglected under low applied loads and low austempering temperature.
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