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Materials 2016, 9(11), 865; doi:10.3390/ma9110865

Effects of WC-17Co Coating Combined with Shot Peening Treatment on Fatigue Behaviors of TC21 Titanium Alloy

1
Institute of Corrosion and Protection, School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, China
2
Institute of Machinery Manufacturing Technology, China Academy of Engineering Physics, Mianyang 621999, China
3
Xi’an Aircraft International Corporation, Xi’an 710089, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Silvia Gross
Received: 30 August 2016 / Revised: 18 October 2016 / Accepted: 19 October 2016 / Published: 25 October 2016
View Full-Text   |   Download PDF [11429 KB, uploaded 25 October 2016]   |  

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. View Full-Text
Keywords: WC-Co coating; TC21 titanium alloy; fatigue; shot peening; residual stress; toughness WC-Co coating; TC21 titanium alloy; fatigue; shot peening; residual stress; toughness
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Du, D.; Liu, D.; Zhang, X.; Tang, J.; Meng, B. Effects of WC-17Co Coating Combined with Shot Peening Treatment on Fatigue Behaviors of TC21 Titanium Alloy. Materials 2016, 9, 865.

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