Research on the microstructure and mechanical properties of the wear-resistant layer of laser clad TiC/diamond cut-off teeth

In order to enhance the wear resistance of the fused cladding layer of 42CrMo cut-off teeth and reduce the problem of its high wear rate in a super-hard rock environment, TiC/diamond particles reinforced Fe-based composite fused cladding layer was prepared on the surface of 42CrMo substrate by laser cladding technology. The distribution and typical morphology of diamond, TiC and holes in the cladding layer were analyzed with the optical microscope and SEM, and the mechanical properties of the cladding layer were estimated by using microhardness tester. The results show that the diamond particles are concentrated at the top, in which the floating phenomenon of small diamond particles is more obvious. The hard phase distribution of diamond and TiC in the bilayer cladding is improved compared with that of the single, and the holes are reduced. Most of the diamond morphology in the cladding layer is preserved intact, with clearly defined corners and angles. However, the diamond is subjected to repeated heating when the bilayer cladding is melted, increasing the chances of thermal damage and cracking. The overall average microhardness of the double-layer cladding (703.23 HV 10 ) was increased by 15.24% compared to the single-layer cladding.