Wear processes in sliding systems

Surface nanocrystallization of 316L stainless steel induced by ultrasonic shot peening

“…The microstructural evolution of the peened 316L stainless steel is similar to what was observed for surface wear [13]. In a sliding system, local contacts cause large plastic strains in block material.…”

On the thermodynamics of degradation

“…In fact, Tsuya (1976) observed for copper sliding against steel, intense plastic deformations that occur in a 10-50 mm thick skin layer on the softer copper, and attributed plastic dissipation in this 'severely deformed region' as a principal mechanism of friction force. Rigney & Hirth (1979), Heilmann & Rigney (1981), Rigney et al (1984) and Rigney & Hammerberg (1998) equated the friction energy to the plastic work dissipated in this region, and obtained good agreement with Tsuya's measured friction force. Kennedy (1989) measured the near-surface deformations due to sliding using microscopic observations of the contact region and compared these values with values predicted by his analytical model.…”

Effects of Dry Sliding Wear of Wrought Al-Alloys on Mechanical Mixed Layers (MML)

“…In agreement with Rice et al (1981), Heilmann et al (1983 and Rigney et al (1984), the mixed layer is composed of a mixture of two mating materials and from this layer, the loose debris were derived. Based on the results of EDS (Figs.…”

“…The oxides were found to be coexisted with other phases in the MML and the wear debris, which is an expected phenomenon since the wear system was exposed to air. They could provide microstructural stability as a second phase in the ultrafine grained structure in debris, as proposed by Rigney et al (1984). The oxides which have been known to form some protective and some destructive (Fischer, 1997 andRavikiran et al, 1995) were then fractured and comminuted in further sliding process.…”