Abstract
Summary The several theories advanced to explain the mechanism of surface damage through fretting-corrosion are a matter of controversy. The conditions of fretting-corrosion induce chemical and mechanical friction actions; one of the very essential points is to know which of these two agents governs the kinetics of destruction; moreover, there is, to date, no way of rational solution of the problem in industrial situations. In this article, geometrical (roughness) and mechanical (residual stresses) quantifications are utilized to show: i) up to what point the mechanical actions of fretting-corrosion on the surface and in the substrate, remain similar to sliding friction; ii) at what level the fundamental difference in their actions is situated. This experimental work covers flat surfaces on samples machined and treated in industrial conditions; several pairs of materials have been tested in different working conditions. The principal results obtained are as follows: i) geometrical analysis shows the presence of a slight abrasion together with a more complex mechanism of particle tearing; ii) analysis through X-ray diffraction shows that macro-residual stresses are compressions and are maximal at the surface (up to - 735 MPa), and high gradient stresses in the under-layer; it shows also a homogeneous plastic deformation zone of small thickness (10-15 μm) 1 imitated by the planes of maximal fatigue, and intense hardening of the surface with fatigue in the under layer. A parallel is drawn between these results and those obtained in the case of generalised sliding friction.
Published Version
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