Abstract
Fe based amorphous alloys have no defects such as grain boundaries and dislocations, with high hardness and high wear resistance. However, due to the limitation of amorphous brittleness and size effect, they have been unable to realize engineering application. Using ultra-high speed laser cladding technology to prepare Fe based amorphous powder into coating can not only give play to its excellent properties, but also avoid the limitations caused by size effect. Therefore, it has broad application prospects and is expected to become a breakthrough in the engineering application of Fe based amorphous alloy. In this paper, we make Fe52.8Cr22.4Mo18.3B2Si1.2C2.1 on 27SiMn by laser cladding, in view of the phenomenon that cracks are easy to occur in the high hardness coating, the optimization scheme of prefabricated transition layer is designed, the Fe based amorphous coating is toughened, and its wear resistance is studied. The results show that the toughening effect of Ni as the transition layer is the best, and the occurrence rate of surface micro cracks of the coating can be reduced to 35%. The microhardness of the coating is about 1200HV0.1, which is 6 times that of the substrate.
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