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

doi:10.1007/s40195-016-0449-3

Abstract

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.

Key words: Titanium alloy, Plasma chromizing, Shot peening, Fretting fatigue, Wear

Shou-Ming Yu, Dao-Xin Liu, Xiao-Hua Zhang, Cheng-Song Liu. A Comparison Study of Wear and Fretting Fatigue Behavior Between Cr-alloyed Layer and Cr-Ti Solid-solution Layer[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(8): 782-792.

Figures/Tables 14

Fig. 1 Schematic drawing of Ti6Al4V alloy fretting fatigue specimen and Ti6Al4V alloy fretting pad

Fig. 2 Cross-sectional structure a and composition depth profile b of the Cr-alloyed layer

Fig. 3 Cross-sectional hardness profiles of various surface-treated samples

Fig. 4 BSE images of the samples tested by static indentation at a load of 70 N or 150 N

Fig. 5 Variations in the friction coefficients of Ti6Al4V base material and various surface-treated samples with the function of sliding time

Fig. 6 Profiles of the wear tracks of Ti6Al4V base material and various surface-treated samples

Fig. 7 Worn surface morphologies of Ti6Al4V base material and various surface-treated samples

Fig. 8 Plain fatigue life of Ti6Al4V base material and various surface-treated samples at a stress of 700 MPa

Fig. 9 Residual stress versus depth profile of various surface-treated samples

Fig. 10 Fretting fatigue life of Ti6Al4V base material and various surface-treated samples

Fig. 11 Morphologies of the fretting contact zones a, c, e and fretting fatigue fracture surfaces b, d, f of the Ti6Al4V base material a, b, the sample with Cr-alloyed layer c, d and the sample with Cr-Ti solid-solution layer e, f

Fig. 12 Morphologies of the fretting contact zones a, c, e and the fretting fatigue fracture surfaces b, d, f of the shot peened samples: a, b BM + SP sample; c, d BM + Cr + SP sample; e, f Cr-Ti + SP sample

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