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Adhesive wear of a Ti6Al4V tribopair for a fast friction contact

Abstract : Friction tests at high sliding velocity are carried out by subjecting specimens to an apparent normal pressure of 110 MPa in the range of 40–64 m/s to reproduce severe conditions of contact between the rotating blades and the rotor in aircraft engines. Therefore, impacts of a projectile against a fixed sample are carried out for the investigation of a pair of Ti6Al4V materials. A mean coefficient of friction has been ascertained by two types of method: a tribometer device and an energetic approach. A slight sensitivity of the coefficient of friction with respect to the sliding velocity is observed. Postmortem analyses of samples reveal a decomposition of the frictional subsurface in multiple distinct layers: initial microstructure, severe plastic deformation (shear strain up to 16), phase transformation (View the MathML sourceT>980°C) and material transfer. A scenario of the adhesive wear mechanism is proposed in four steps.
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Submitted on : Thursday, April 27, 2017 - 10:25:56 AM
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G. Chassaing, Laurent Faure, S. Philippon, M. Coulibaly, Albert Tidu, et al.. Adhesive wear of a Ti6Al4V tribopair for a fast friction contact. Wear, Elsevier, 2014, 320, pp.25 - 33. ⟨10.1016/j.wear.2014.08.001⟩. ⟨hal-01515223⟩



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