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采用横流CO2激光器在TC4合金表面熔覆NiCrBSiC合金涂层,探讨了激光熔覆工艺参数对涂层稀释率和微观结构的影响。结果表明,在激光功率密度和辐照时间相同的条件下,大直径(D=6 mm)光斑热源能获得更深的基体熔化深度,涂层的稀释率较高,涂层中的强化相主要为TiB2和TiC相;小直径(D=3 mm)光斑热源基体熔化深度较浅,涂层的稀释率较低,涂层中的强化相为CrB以及少量的M23(CB)6和TiC相。
The cross-flow CO2 laser cladding NiCrBSiC alloy coating on the surface of TC4 alloy to discuss the influence of laser cladding process parameters on the coating dilution rate and microstructure. The results show that under the same laser power density and irradiation time, the larger diameter (D = 6 mm) spot heat source can obtain a deeper melting depth of the matrix, and the dilution rate of the coating is higher. The strengthening phase in the coating is mainly TiB2 and TiC. The melting depth of the substrate with a small diameter (D = 3 mm) is relatively shallow, and the dilution rate of the coating is low. The strengthening phase in the coating is CrB and a small amount of M23 (CB) 6 and TiC phases.