Microstructure of In-situ Synthesized Ti Based TiC-TiB2 Composite Coating on Surface of Ti811 Alloy by Laser Cladding
ZHANG Tiangang1, SUN Ronglu2,3, ZHANG Xueyang1, LIU Yanan2
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
Abstract: A multipass TC4 and Ni45 laser cladded layer was prepared on the surface of Ti811 titanium alloy by coaxial powder feeding. Subsequently, the X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and microhardness measurment were adopted to analyze the microstructure, phase composition and performance of the obtained coating. The experiment results confirmed the main uniformly-distributed precipitates in the clad layer, including α-Ti substrate, Ti2Ni intermetallic compound, TiC and TiB2 reinforcement phase. A large amount of TiC/TiB2 multi-phase structures distri-bute in the layer, which consist of the heterogeneous nucleation of spherical or subspheroidal TiC particles on the strip TiB2 surface, and there are numerous nano-TiC particles dispersed in the substrate. The combined action of TiC and TiB2 benefits significantly the cladded layer’s hardness, as the highest microhardness is about 770HV0.5, which is almost twice the value of the substrate.
张天刚, 孙荣禄, 张雪洋, 刘亚楠. Ti811表面激光熔覆原位合成TiC-TiB2复合Ti基涂层的微观组织分析[J]. 《材料导报》期刊社, 2018, 32(13): 2208-2213.
ZHANG Tiangang, SUN Ronglu, ZHANG Xueyang, LIU Yanan. Microstructure of In-situ Synthesized Ti Based TiC-TiB2 Composite Coating on Surface of Ti811 Alloy by Laser Cladding. Materials Reports, 2018, 32(13): 2208-2213.
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2018, Vol. 32 
