Abstract:The effects of different heat treatment regimes on the microstructure, hardness and friction and wear properties of laser deposited DZ125 superalloys were investigated. The results show that the dendritic morphology of the depositional area is columnar dendrite growing on the outer edge, and the average primary dendrite spacing is about 7.8μm. After single-stage aging (870 °C/20h, AC) and two-stage aging (1100 °C/4h, AC to 870 °C/20h, AC), the dendritic morphology and sedimentary state of the sample are not much different, γ" The coarsening phenomenon occurs in each phase, and the γ" phase coarsening degree and the size distribution are more uniform after the two-stage aging heat treatment; Under the two-stage aging heat treatment system, the average size and content of different aging temperature γ" phases are different, including 1100 °C/4h, AC to 870 °C/20h, and the average size and content of γ" phase are the largest under AC system; After single-stage aging and two-stage aging heat treatment, the content of Ti in the carbides showed a downward trend; After two-stage aging heat treatment, two kinds of irregularly shaped MC carbides are precipitated, which are M23C6 type carbides rich in Cr and Co elements and M6C type carbides rich in W and Mo elements; The wear mechanism of the unipolar aging and the two-stage aging heat treatment specimens is abrasive wear. The microhardness and wear resistance of the two-stage aging heat treatment samples are better than the single-stage aging.