The microstructure and properties of a medium-carbon Ti-Mo-bearing steel treated by one-step quenching and partitioning route were investigated. The results show that the low-temperature toughness was improved with partitioning time at 250 °C, while it decreased with partitioning time at 310 °C. In addition, with increasing partitioning temperature, the tensile strength, hardness and low-temperature toughness were simultaneously decreased, especially at longer partitioning time (the reduction reached up to ~300 MPa, ~100 HV and ~20 J, respectively). Moreover, the (002) crystal plane spacing of (Ti, Mo)C was 0.212 nm, and the lattice constant of (Ti, Mo)C particles was 0.424 nm. Finally, the wear performance of samples partitioned at 250 °C was obviously better than that of samples partitioned at 310 °C. The morphology of worn surface of samples partitioned at 250 °C was characterized by plastic fatigue morphology, while the worn surface of samples partitioned at 310 °C was mainly dominated by grooves.

研究了一步淬火配分法处理的中碳Ti-Mo轴承钢的组织和性能。结果表明，低温韧性随着分配时间在 250 ℃下提高，而在 310 ℃下随着分配时间降低。此外，随着分配温度的升高，拉伸强度、硬度和低温韧性同时下降，尤其是在较长的分配时间（减少量分别达到~300 MPa、~100 HV和~20 J）。此外，(Ti，Mo)C的(002)晶面间距为0.212nm，(Ti，Mo)C粒子的晶格常数为0.424nm。最后，在 250 °C 分配的样品的磨损性能明显优于在 310 °C 分配的样品。