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Abstract
This study investigated the impact of laser remelting on the microstructure and properties of Mo₂FeB₂ coatings on AISI 1045 steel substrate. Different laser remelting powers were applied to pre-deposited Mo₂FeB₂ coatings. The cross-sectional morphology, phase composition, microstructure, microhardness, residual stress, fracture toughness, and wear resistance of the coatings were systematically analyzed. Compared to the untreated coatings, the remelted coatings exhibited reduced height and significantly refined microstructure. The primary phase observed in the coating was Mo₂FeB₂, accompanied with minor phases such as Cr₃C₂. Optimal microhardness (1209.4 HV0.5), fracture toughness (14.5 MPa·m1/2), and wear rate (5.4× 10−5 mm3/N·m) were achieved at a remelt power of 1200 W. Additionally, the residual stress in the coatings decreased with increasing power, reaching a minimum of 268 MPa at 1500 W. The wear mechanism transitioned from adhesive wear to abrasive wear with increasing remelting power. These findings highlight the beneficial effects of laser remelting in enhancing the performance of Mo₂FeB₂ coatings for industrial applications.
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