科研之友
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摘要
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 degrees C, while it decreased with partitioning time at 310 degrees 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 similar to 300 MPa, similar to 100 HV and similar to 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 degrees C was obviously better than that of samples partitioned at 310 degrees C. The morphology of worn surface of samples partitioned at 250 degrees C was characterized by plastic fatigue morphology, while the worn surface of samples partitioned at 310 degrees C was mainly dominated by grooves.
