A Comparison Study of Wear and Fretting Fatigue Be

Authors: ShouMing Yu DaoXin Liu XiaoHua Zhang ChengSong Liu

Publish Date: 2016/06/30

Volume: 29, Issue: 8, Pages: 782-792

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Abstract

This work reported a comparison between the wear and fretting fatigue FF behaviors of a Cralloyed layer and a Cr–Ti solidsolution layer The hardness and toughness of both layers were evaluated to support this comparison The results showed that the Cralloyed layer had high surface hardness but poor toughness while the Cr–Ti solidsolution layer had excellent toughness but low hardness The FF properties of the modified Ti6Al4V alloy depended on the tradeoff between two factors wear resistance and fatigue resistance Although the Cralloyed 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 solidsolution layer had slightly higher FF life than that of the Cralloyed 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 posttreatment 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 combinationtreated samples

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