In this research, FeCrMoMn coatings with excellent corrosion resistance and metallurgical quality were deposited on the 45# steel substrate by conventional and high-speed laser cladding at the scanning speed of 0.4 m/min, 40 m/min and 70 m/min, respectively. Their microstructure, phase composition, hardness and corrosion resistance were characterized and compared. The results show that compared with the conventional cladding, high-speed laser cladding leads to a decrease in grain size, heat affected zone, and the dilution rate of the coatings due to solute trapping of coatings. Metallurgical bonding is formed between the substrate and the coatings, and the hardness and electrochemical corrosion resistance of the coatings are also significantly improved.

本研究通过常规激光熔覆和高速激光熔覆分别以0.4 m/min、40 m/min和70 m/min的扫描速度在45#钢基体上沉积出具有优异耐蚀性和冶金质量的FeCrMoMn涂层. 对它们的微观结构、相组成、硬度和耐腐蚀性能进行了表征和比较。结果表明，与传统熔覆相比，高速激光熔覆由于涂层的溶质俘获而导致晶粒尺寸、热影响区和涂层稀释率的减小。基体与涂层之间形成冶金结合，涂层的硬度和耐电化学腐蚀性能也得到显着提高。