钛合金表面激光熔覆镍基涂层质量分析

Quality Analysis of Nickel-based Coating on Ti Alloy Surface by Laser Cladding

通过在钛合金表面激光熔覆镍基涂层,探讨了扫描速度对熔覆层宏观形貌的影响,激光能量密度对熔覆层微观组织的影响,WS2添加量对熔覆层宏观形貌、成型质量、组织均匀性和显微硬度的影响。结果表明:随扫描速度的提高,钛合金表面激光熔覆层的宽度、高度和基底熔深均减小。随熔覆材料中WS2含量的增加,熔覆层形貌从凸起型过渡为凹陷型,且粉末利用率降低;熔覆层裂纹和气孔等缺陷变多;微观组织均匀性变差。添加WS2的熔覆层显微硬度低于Ni60熔覆层。

By laser cladding nickel-based self-lubricating coatings on titanium surface, the effects of scanning speed on the cladding layer macro-morphology, the effects of the energy density on microstructure, and the effects of WS2 content on the cladding layer macroscopic morphology, forming quality, uniformity and microhardness were discussed. The results show that： with the increase of scanning speed, the width, height, base penetration of laser cladding coating on titanium surface reduce. With the increase of WS2 content, the type of cladding layer morphology changes from convex to concave transition,and the utilization of powder becomes lower; cladding layer cracks and holes and other defects become more; and the microstructure uniformity deteriorates. The hardness of cladding layer adding WS2 is lower than that of Ni60 cladding.