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通过改变激光扫描速度来改变熔覆过程中钛合金基材的熔化程度,进而研究稀释率的不同对钛合金表面镍基熔覆层质量的影响。结果表明,随着扫描速度的提高,稀释率减小。随着稀释率的提高,熔覆层中小球状颗粒(Ti C)数量明显增加,块状相(Ti B2)数量稍有增加,熔覆层显微硬度提高。但在一定范围内提高扫描速度,稀释率下降但熔覆层显微硬度无明显变化。稀释率较低时,熔覆层出现裂纹的几率偏大。
By changing the laser scanning speed to change the melting process of titanium alloy substrate during melting, and then study the different dilution rate on the quality of the nickel-based coating on the surface of titanium alloy. The results show that with the increase of scanning speed, the dilution rate decreases. With the increase of the dilution rate, the number of small spherical particles (TiC) in the cladding layer increased obviously, the amount of the bulk phase (TiB2) slightly increased, and the microhardness of the cladding layer increased. However, within a certain range to improve the scanning speed, the dilution rate decreased but no significant changes in the micro-hardness of the cladding layer. When the dilution rate is low, the possibility of cracks in the cladding is large.