1 Engineering Technology Training Center, Civil Aviation University of China,Tianjin 300300; 2 School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387; 3 Tianjin Area Major Laboratory of Advanced Mechatronics Equipment Technology, Tianjin 300387; 4 College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300
Abstract: 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 martensite α′ and residual β′-Ti are distributed in the grain boundary composed of α-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 substrate α-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 485HV0.5. The highest microhardness of multitrack coating is 510HV0.5.
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2018, Vol. 32 
