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.

研究了在不同温度下回火的超细贝氏体钢的力学性能和耐磨性。扫描电子显微镜（SEM）和X射线衍射被用来分析微观结构。通过激光扫描共聚焦显微镜和SEM观察磨损的表面。结果表明，在低奥氏体温度下，力学性能有所不同，耐磨性基本保持不变。样品的抗张强度高于1800 MPa，但是只有一个在230°C下回火的样品的伸长率大于10％。样品的重量损失与磨损周期大致成线性关系，与载荷非线性相关。在不同的等温温度下，样品的耐磨性差异不大，而其变形层的厚度变化很大。结果与样品的初始硬度和残余奥氏体的稳定性有关。同时，实验结果表明，在较低的外加载荷和较低的回火温度下，回火温度对超细贝氏体钢耐磨性的影响可以忽略。