Abstract In this paper, Ti/TiBCN reinforced Ti based composite coatings were prepared on Ti6Al4V alloys. The influence of the scanning speed on the dilution rate, microstructure and properties was studied. Results showed that when the scanning speed increased from 3 mm/s to 9 mm/s, the dilution rates of the composite coatings presented a decreasing tendency, the microstructure of the composite coatings was basically the same, with short whisker AlTi-Al3Ti phases as the intermetallic matrix and numerous rod-like and dendritic TiBCN, block-shaped TiB2, white polygonal TiN, white needlelike and granular TiC as the reinforcing phases uniformly dispersed throughout. Furthermore, when the scanning speed was 7 mm/s, the microstructure of the coating was finer and less defects. In addition, with the scanning speed going up, the microhardness of the composite coatings first increased and then decreased, the maximum value (1074 HV0.2) was obtained in the coating with a scanning speed of 7 mm/s, which was 3 times that of the substrate (350 HV0.2). The coefficient of friction, wear mass loss, wear volumes, and energy dissipation of the composite coatings first deceased and then increased, and the best wear resistance occurred when the scanning speed was 7 mm/s.

中文翻译：

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不同扫描速度激光熔覆制备Ti/TiBCN增强Ti基复合涂层的组织和性能表征

摘要 本文在Ti6Al4V 合金上制备了Ti/TiBCN 增强Ti 基复合涂层。研究了扫描速度对稀释率、显微组织和性能的影响。结果表明，当扫描速度从 3 mm/s 增加到 9 mm/s 时，复合涂层的稀释率呈下降趋势，复合涂层的微观结构基本相同，短晶须 AlTi-Al3Ti 相为金属间化合物基体和大量棒状和树枝状TiBCN、块状TiB2、白色多角形TiN、白色针状和粒状TiC作为增强相均匀分散于各处。此外，当扫描速度为 7 mm/s 时，涂层的微观结构更精细，缺陷更少。此外，随着扫描速度的提高，复合涂层的显微硬度先升高后降低，在扫描速度为7 mm/s的涂层中获得最大值（1074 HV0.2），是基体（350 HV0.2）的3倍. 复合涂层的摩擦系数、磨损质量损失、磨损量和能量耗散均先减小后增大，扫描速度为7 mm/s时耐磨性最佳。