摘要
按照CFM发动机维修手册的修复建议,在Ti811钛合金表面,利用同步送粉激光熔覆技术,制备了单道与多道搭接TC4激光熔覆层。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱分析仪(EDS)等分析了涂层组织和相组成,利用显微硬度计测试了涂层的显微硬度。结果表明,单道涂层微观组织呈现魏氏体结构,由α-Ti组成的晶界中分布大量的针状马氏体α′和残留β′-Ti,涂层中弥散分布着10—150nm的纳米Ti_3Al;多道搭接涂层由基底α-Ti和均匀分布的Ti_3Al组成;单道涂层和多道搭接涂层的显微硬度相比基底都有所提高,单道涂层显微硬度最高为485HV_(0.5),多道搭接涂层显微硬度最高为510HV_(0.5)。
According to the proposed repair scheme of CFM engine maintenance manual,single-pass and multitrack TC4 laser cladding layers were prepared on the surface of Ti811 titanium alloys with coaxial powder feeding.Phase compositions and microstructures of coatings were analyzed by scanning electron microscope（SEM）,X-ray diffraction（XRD）and energy dispersive spectrometer（EDS）.The microhardness profiles of coatings along the depth direction were measured on a microhardness tester.The results show that the microstructure of the single-pass coating shows the widmanstatten structure.Many acicular martensiteα′and residualβ′-Ti are distributed in the grain boundary composed ofα-Ti and the nanoparticle Ti3Al is dispersed in the single-pass coating with 10—150 nm.The microstructure of the multitrack coating evenly distributed Ti3Al in addition to the substrateα-Ti.The microhardness is improved compared with that of the substrate in both single-pass and multitrack coatings.The highest microhardness of single-pass coating is about 485 HV0.5.The highest microhardness of multitrack coating is 510 HV（0.5）.
作者
张天刚
孙荣禄
安通达
张宏伟
ZHANG Tiangang;SUN Ronglu;AN Tongda;ZHANG Hongwei(Engineering Technology Training Center,Civil Aviation University of China,Tianjin 300300;School of Mechanical Engineering,Tianjin Polytechnic University,Tianjin 300387;Tianjin Area Major Laboratory of Advanced Mechatronics Equipment Technology,Tianjin 300387;College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第12期1983-1987,共5页
Materials Reports
基金
国家自然科学基金(51371125)
