摘要
为了改善TC4合金的表面耐磨性能,采用激光熔覆技术在TC4合金表面制备出Ti-Mo-Al-B复合涂层。分析了涂层的物相组成及微观组织结构,揭示了复合涂层的合成机理,结合其组织特征分析了涂层的硬度分布,并分析了不同载荷下涂层的摩擦磨损性能。结果表明,复合涂层与基体之间形成了良好的冶金结合,复合涂层主要由BCC固溶体基体相、短杆状和颗粒状TiB增强相以及少量α-Ti相组成。涂层的平均硬度为648.69HV,较基体TC4合金(330HV)提升了1.97倍。涂层的磨痕表面平整且犁沟较少,在载荷为30 N时,磨损量相较TC4基体减少了11%,其磨损机制为磨粒磨损。
In order to improve the wear properties of TC4 alloy,A Ti-Mo-Al-B composite coating was prepared on the surface of TC4 alloy using laser cladding technology.The phase composition and microstructure of the coating were studied and analyzed,the synthesis mechanism of the composite coating was revealed,and the hardness distribution of the coating was analyzed combined with its structural characteristics.In addition,the friction and wear properties of the coating under different loads were also studied and analyzed.The results show that a good metallurgical bond is formed between the composite coating and the matrix.The composite coating is mainly composed of BCC solid solution matrix phase,short rod and granular TiB reinforcing phase,and a small amount ofα-Ti phase composition.The average hardness of the coating is 648.69HV,which is 1.97 times higher than that of the matrix TC4 alloy(330HV).The abrasive surface of the coating is flat with a few furrows.When the load is 30 N,the wear amount is reduced by 11%compared with TC4 matrix,and its wear mechanism is abrasive wear.
作者
肖华强
尹星贵
冯进宇
肖易
龚玉婷
XIAO Huaqiang;YIN Xinggui;FENG Jinyu;XIAO Yi;GONG Yuting(College of Mechanical Engineering,Guizhou University,Guiyang 550025,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第12期135-140,共6页
Materials Reports
基金
国家自然科学基金(52065009)
贵州省科技计划项目(ZK[2021]269)
贵阳市科技计划项目([2021]1-4)。
关键词
激光熔覆
复合涂层
显微组织
合成机理
TC4
摩擦磨损
laser cladding
composite coating
microstructure
synthesis mechanism
TC4
friction and wear
