Abstract：The preparation of Mo2FeB2 cermet by vacuum sintering technology causes a large initial investment for equipment, low production efficiency, high cost and poor adaptability for engineering applications. In order to overcome these disadvantages, the Mo2FeB2 cermet can be prepared by laser cladding. In this paper, the effects of RE(Rare earth) mass fraction on the microstructure and properties of cladding metal were studied by means of scanning electron microscope (SEM) and hardness tester. It was found that the hard phase of the claddings with 2% RE addition was obviously refined compared with that without the addition of rare earth. With the further increase of rare earth addition, the hard phases began to agglomerate and connect with each other. Adding rare earth can make more Cr element replace Fe element in Mo2FeB2 . The replacement is more at addition of 2% RE , is the most at the addition of 8% RE, and is less at the addition of 4% RE. As for the claddings with 0, 2%, 4% and 8% RE added, the area fractions of the hard phase were 30.84%, 53.74%, 71.25% and 54.92%, respectively, and the average microhardness were 627HV, 923HV, 1008HV and 742HV. These results suggest that the area fraction of the hard phase and the hardness of the claddings are significantly improved with the addition of RE.
2022, 
