TA15钛合金表面原位合成TiC增强钛基激光熔覆层的组织与耐磨性  

Microstructure and wear resistance of in-situ TiC reinforced Ti-based coating by laser cladding on TA15 titanium alloy surface

作　　者：安强 祁文军[1] 左小刚 AN Qiang;QI Wenjun;ZUO Xiaogang(School of Mechanical Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Joinworld Company Limited,Urumqi 830013,China)

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830047 [2]新疆众合股份有限公司,乌鲁木齐830013

出　　处：《材料工程》2022年第4期139-146,共8页Journal of Materials Engineering

基　　金：新疆维吾尔自治区高校科研计划自然科学重点项目(XJEDU2020I007);新疆维吾尔自治区自然科学基金(2021D01C051)。

摘　　要：采用激光熔覆技术在TA15钛合金表面原位合成TiC增强钛基涂层。利用光学显微镜、扫描电镜、X射线衍射仪、能谱分析仪、显微硬度计、摩擦磨损试验机等研究涂层的成形质量、微观组织、物相组成、硬度和摩擦学性能。结果表明:涂层主要由β-Ti,Co_(3)Ti,CrTi_(4)和TiC等物相组成,涂层与基体形成了良好的冶金结合。涂层结合区组织是平面晶和柱状晶,中部组织是树枝晶,顶部组织是等轴晶。涂层各微区的碳化钛形貌有显著差别,其中顶部和中部区域碳化钛为粗大的树枝状和花瓣状,而结合区为针状和近球状。涂层显微硬度最大值为715HV,约是TA15显微硬度(330HV)的2.1倍;同等条件下涂层磨损量为30.14 mg,约为TA15磨损量98.11 mg的30.7%。涂层与基体的磨损机制均为磨粒磨损和黏着磨损的复合磨损模式,但涂层的磨损程度较轻。The TiC-reinforced Ti-based coating was prepared in-situ on the surface of the titanium alloy TA15 by laser cladding technology.The forming quality,microstructure,phase composition,hardness,and tribological properties were investigated by optical microscope,X-ray diffractometer,scanning electron microscope,energy spectrum analyzer,microhardness tester and friction and wear apparatus.The results show that the coating mainly composes of β-Ti,Co_(3)Ti,CrTi_(4) and TiC,and the good metallurgical bond is formed between coating and the substrate.The microstructure of the coating bond zone is planar crystal and columnar crystal,the middle is dendritic,and the top is equiaxed.Significant differences in the morphology of TiC are observed in each micro-area of the coating.TiC of the top and middle areas is thick dendritic and petal-like,while TiC of the bonding area is needle-like and spherical.The maximum microhardness of the coating is 715HV,which is about 2.1 times than that of TA15(330HV).Under the same conditions,the wear loss of coating is 30.14 mg,which is about 30.7%of TA15(98.11 mg).The wear mechanism of the cladding coating and substrate is a composite wear mode of adhesive wear and abrasive wear,but the wear degree of the coating is lighter.

关 键 词：TA15 激光熔覆 钛基涂层 微观组织 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]