Research on Strengthening Process of Laser Additive Remanufacturing of Mill Housing

Based on the analysis of the wear mechanism of the mill housing, the results show that the main failure forms of the mill housing are corrosion wear and stress wear. Therefore, it is proposed to remanufacture and repair the housing to improve the hardness and impact resistance of the wear part of the housing. In order to strengthen the wear resistance of the wear part of the housing, Fe45+5%WC alloy powder was prepared to strengthen the wear resistance of the worn part of the housing. The sample of the alloy layer was produced by high power semi-conductor laser, the hardness, impact toughness and surface PT were tested, and the microstructure was observed by metallographic and EDS experiments. The results show that the alloy layer has high hardness and wear resistance, and the grains are fine and the alloy layer is metallurgical bonded to the substrate. The 3500mm reversing mill housing was repaired by laser re-manufacturing technology, and it was found that the alloy layer had good bonding and surface hardness was improved, thus strengthening the housing.