Abstract
The improvement and mechanism of the fatigue resistance of TC21 high-strength titanium alloy with a high velocity oxygen fuel (HVOF) sprayed WC-17Co coating was investigated. X-ray diffraction (XRD) and the corresponding stress measurement instrument, a surface roughness tester, a micro-hardness tester, and a scanning electron microscope (SEM) were used to determine the properties of the HVOF WC-17Co coating with or without shot peening. The fatigue behavior of the TC21 titanium alloy with or without the WC-17Co coating was determined by using a rotating bending fatigue testing machine. The results revealed that the polished HVOF sprayed WC-17Co coating had almost the same fatigue resistance as the TC21 titanium alloy substrate. This resulted from the polishing-induced residual surface compressive stress and a decrease in the stress concentration on the surface of the coating. Moderate-intensity shot peening of the polished WC-17Co coatings resulted in significant improvement of the fatigue resistance of the alloy. Furthermore, the fatigue life was substantially higher than that of the substrate, owing to the deep distribution of residual stress and high compressive stress induced by shot peening. The improved surface toughness of the coating can effectively delay the initiation of fatigue crack propagation.
Highlights
Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb, referred to as TC21 in China, has emerged as a novel high-strength titanium alloy
The effect of high velocity oxygen fuel (HVOF) WC-17Co coatings and shot peening on the fatigue behavior of ideas that lead to improved fatigue performance of the HVOF WC-Co hard coating and, in turn, of the the TC21 high-strength titanium alloy was investigated in this work
The goal of this study is to high-strength titanium parts. fatigue performance of the HVOF WC-Co hard coating and, in provide ideas that leadalloy to improved turn, of the high-strength titanium alloy parts
Summary
Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb, referred to as TC21 in China, has emerged as a novel high-strength titanium alloy. The wear resistance of metallic materials can be significantly increased by using high velocity oxygen fuel (HVOF) spraying WC-Co coating technology. This method prevents mesh micro-cracking of the hard chrome plating layer, and is environmentally friendly. HVOF technology has significant potential for improving the wear resistance of aircraft landing gear parts [3,4,5,6,7]. The main damage mode of aircraft landing gear parts, results from the anti-fatigue properties of WC-Co hard coatings deposited on metal substrates. The anti-fatigue performance of HVOF WC-Co coatings can be improved via polishing, but retention of the base-metal fatigue resistance is often difficult [3,4,5,8,9,10]
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