Microstructure and wear resistance of laser alloying coating on TC4 titanium alloy surface

doi:10.13251/j.issn.0254-6051.2020.02.044

Abstract

Abstract:

Mixed powder of WC(with 0.1wt%C), Ni and Si was used as raw material, and the coating was prepared in situ on the surface of TC4 titanium alloy by laser alloying technology. The microstructure and composition of the coating were analyzed by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and energy spectrum (EDS). The microhardness and friction and wear properties of the coatings were measured by HXD-1000 Vickers microhardness tester and MMW21 vertical universal friction and wear testing machine. The results show that the coating with higher WC content prepared by optimized laser alloying parameters is uniform and compact, no crack is observed, and is metallurgical bonding with the TC4 alloy substrate. The phase of the coating is mainly composed of α-Ti, Ti₅Si₃, WC and TiNi. The hardness of the coating is 950 HV0.2, the average friction coefficient is 0.2, the average wear loss is 0.308 mg, and the wear resistance is remarkably improved.

Key words: TC4 titanium alloy, laser alloying, microstructure and composition, wear resistance

CLC Number:

TG135⁺.6

Yi Jia, Peng Rushu. Microstructure and wear resistance of laser alloying coating on TC4 titanium alloy surface[J]. HTM, 2020, 45(2): 225-230.

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