A Comparison Study of Wear and Fretting Fatigue Behavior Between Cr-alloyed Layer and Cr–Ti Solid-solution Layer

Abstract

This work reported a comparison between the wear and fretting fatigue (FF) behaviors of a Cr-alloyed layer and a Cr-Ti solid-solution layer. The hardness and toughness of both layers were evaluated to support this comparison. The results showed that the Cr-alloyed layer had high surface hardness but poor toughness, while the Cr-Ti solid-solution layer had excellent toughness but low hardness. The FF properties of the modified Ti6Al4V alloy depended on the trade-off between two factors: wear resistance and fatigue resistance. Although the Cr-alloyed layer could effectively resist the wear in fretting areas, its poor toughness caused the fatigue resistance to drop sharply and hence led to a premature failure in FF test. Due to the relatively good fatigue resistance, the Cr-Ti solid-solution layer had slightly higher FF life than that of the Cr-alloyed layer; however, its low hardness resulted in severe wear in correspondence with the fretting area and thus a failure to improve the FF properties of Ti6Al4V alloy. When combined with shot peening post-treatment, the FF life of both layers increased by about three times compared to that of the Ti6Al4V alloy. A further study showed that the poor toughness or low hardness still exerted negative influence on combination-treated samples.

Effect of Gaseous carburizing thermochemical treatment on tribological behavior of Ti–6Al–4V alloy

“…In fact the type of contact passes each time from a two-body contact; Al 2 O 3 -Ti 6Al 4V to that with three bodies; Debris -Al 2 O 3 -Ti 6Al 4V; (Fig. 8), which brings us to have the same phenomenon which are in agreement with those of [19,[25][26].…”

“…By comparison, to the other samples, a gain in mass was observed for the cemented samples unlike the original sample without treatment. Several slip regimes and different wear mechanisms have been observed depending on the applied load [19][20][21]. Abrasion phenomenon was observed at different case hardening times for the applied load.…”

Comportement à l’usure et au frottement de deux biomatériaux AISI 316L et Ti-6Al-7Nb pour prothèse totale de hanche

“…En fonction du nombre de cycles, les particules détachées de la surface participent à la cinétique d'usure dans le contact. En effet, le type de contact passe à chaque fois d'un contact à deux corps (Al 2 O 3 -Échantillons) à celui à trois corps (Débris-Al 2 O 3 -Échantillon) [3,7,15]. D'une part, les valeurs moyennes du coefficient de fortement moyen (Fig.…”

“…Pour les grandes vitesses, comme pour les fortes pressions, les variations du coefficient de frottement sont plus lentes [13]. D'autres expérimentateurs ont émis l'idée contraire [14,15] que le coefficient de frottement diminue avec l'augmentation de la pression P et que, pour une pression donnée, il diminue quand l'aire de contact devient plus petite.…”

“…Plusieurs régimes de glissement et différents mécanismes d'usure ont été observés en fonction de la charge appliquée [15][16][17]. À des faibles charges, l'abrasion est observée, et avec l'augmentation de la charge appliquée le mécanisme d'usure par délamination et par fatigue apparaît.…”