TiC-TiB2复合相钛基稀土激光熔覆层组织与性能

doi:10.7527/S1000-6893.2020.24139

Abstract

Abstract: Wear-resistant TC4+Ni45+Co-WC+Y₂O₃ multi-channel overlapping Ti-based composite coatings with different Y₂O₃ mass fractions are cladded on TC4 by the TRUMPF 4002 coaxial powder feeding fiber laser. The microstructure of the coatings is tested and analyzed using XRD, SEM, EDS and EPMA. The microhardness and tribological properties of the coatings are analyzed by a microhardness tester, a friction and wear tester and a white light profiler. The results show that the phases in the coatings remain unchanged with different Y₂O₃ additions, mainly including Ti₂Ni, TiC, TiB₂ and α-Ti. In the coating without Y₂O₃, the phases are large in size with obvious directionality. With the addition of Y₂O₃, the microstructure of the coatings is gradually refined, and the directionality of the phases is weakened. When the Y₂O₃ addition is 3wt%, the precipitates in the coating are mainly particles and short rods, and a large number of TiC-TiB₂ dependent growth composite phases are synthesized in the coating. Based on the two-dimensional lattice misfit calculation, the misfit δ between TiB₂(0001) and TiC(111) is 0.912%, with TiC and TiB₂ forming the coherent interface, thereby effectively increasing the distribution uniformity of the coating microstructure. With the addition of Y₂O₃, the microhardness of the coating decreases gradually, the wear volume of the coating first increases and then decreases, and the friction coefficient of the coating decreases gradually. The antifriction and wear resistance of the 3wt% Y₂O₃ coating are the best under the action of the TiC-TiB₂ dependent growth composite phase, with the wear mechanism of the coating being abrasive wear.

Key words: laser cladding, TC4, TiC-TiB₂ composite phase, Y₂O₃, two-dimensional lattice misfit, friction and wear properties

CLC Number:

V252

ZHANG Tiangang, ZHANG Qian, ZHUANG Huaifeng, LI Baoxuan, XU Yutong. Microstructure and properties of TiC-TiB₂ composite phase Ti-based rare earth laser cladding layers[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021, 42(7): 424139-424139.

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Microstructure and properties of TiC-TiB₂ composite phase Ti-based rare earth laser cladding layers

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Microstructure and properties of TiC-TiB2 composite phase Ti-based rare earth laser cladding layers

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Microstructure and properties of TiC-TiB₂ composite phase Ti-based rare earth laser cladding layers