Title: Fretting behaviour of textured Ti-6Al-4V alloy under oil lubrication

Authors: Wenhui Cao; Tianchang Hu; Hengzhong Fan; Qi Ding; Litian Hu

Addresses: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, China ' State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China ' State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China ' State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China ' State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China

Abstract: The micro-textures with different dimples densities and diameters are prepared on the Ti-6Al-4V surfaces. The influences of surface texture parameters on the fretting wear behaviours of TC4 self-matching pair have been investigated by using a pin-on-disk machine in a reciprocating sliding mode under different applied loads and fretting frequencies at oil lubrication. Results indicated that the proper texture on titanium alloy can greatly improve the fretting tribological properties under different loads. The 10% texture density surface showed the minimum wear volume at a low fretting frequency, whereas the 20% texture density surface had the lowest wear volume at a high fretting frequency. Under the tested condition, the surface with dimple diameter of 50 μm had the best anti-fretting wear performance under the applied fretting frequencies. In addition, the mechanisms for friction-reducing and anti-wear were discussed. The existence of surface texture promoted the transition from dry friction to boundary lubrication state under high fretting frequency, and the dimples can effectively capture wear debris to alleviate the abrasive wear of the material.

Keywords: metal wear; fretting; surface texture; oil lubrication.

DOI: 10.1504/IJSURFSE.2021.118199

International Journal of Surface Science and Engineering, 2021 Vol.15 No.3, pp.165 - 184

Received: 11 Nov 2020
Accepted: 20 Jan 2021
Published online: 15 Oct 2021 *

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