Journal
MATERIALS & DESIGN
Volume 55, Issue -, Pages 404-409Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.09.038
Keywords
Laser cladding; Ti-6Al-4V; Self-lubricating coating; Microstructure; Wear behavior
Categories
Funding
- Jiangsu Provincial Natural Science Foundation of China [BK20131155]
- Suzhou Municipal Scientific Program of China [SYG201349, SYG201233, SG201273]
- Collegiate Natural Science Foundation of Jiangsu Province [11KJB460008]
- National Nature Science Foundation of China [51205266]
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To enhance the wear resistance and friction-reducing capability of titanium alloy, a process of laser cladding gamma-NiCrAlTi/TiC + TiWC2/CrS + Ti2CS coatings on Ti-6Al-4V alloy substrate with preplaced NiCr/Cr3C2-WS2 mixed powders was studied. A novel coating without cracks and few pores was obtained in a proper laser processing. The composition and microstructure of the fabricated coating were examined by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) techniques, and tribological properties were evaluated using a ball-on-disc tribometer under dry sliding wear test conditions at 20 degrees C (room-temperature), 300 degrees C, 600 degrees C, respectively. The results show that the coating has unique microstructure consisting of alpha-Ti, TiC, TiWC2, gamma-NiCrAlTi, Ti2CS and CrS phases. Average microhardness of the composite coating is 1005 HV0.2, which is about 3-factor higher than that of Ti-6Al-4V substrate (360 HV0.2). The friction coefficient and wear rate of the coating are greatly decreased due to the combined effects of the dominating anti-wear capabilities of reinforced TiC and TiWC2 carbides and the CrS and Ti2CS sulfides which have excellent self-lubricating property. (C) 2013 Elsevier Ltd. All rights reserved.
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