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Open AccessArticle

Effect of the Ultrasonic Surface Rolling Process on the Fretting Fatigue Behavior of Ti-6Al-4V Alloy

Corrosion and Protection Research Laboratory, Northwestern Polytechnical University, 127 You Yi Xi Road, Xi’an 710072, China
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Materials 2017, 10(7), 833; https://doi.org/10.3390/ma10070833
Received: 11 May 2017 / Revised: 15 July 2017 / Accepted: 17 July 2017 / Published: 20 July 2017
The effect of the ultrasonic surface rolling process (USRP) on the rotary bending fretting fatigue (FF) of Ti-6Al-4V alloy was investigated. The reason for the USRP’s ability to improve the FF resistance of Ti-6Al-4V alloy was studied. The results revealed that the USRP induced a compressive residual stress field with a depth of 530 μm and a maximum residual stress of −930 MPa. Moreover, the surface micro-hardness of the USRP sample was significantly higher than that of the untreated base material (BM) sample, and the USRP yielded a 72.7% increase in the FF limit of the alloy. These further enhanced fatigue properties contributed mainly to the compressive residual stress field with large numerical value and deep distribution, which could effectively suppress FF crack initiation and early propagation. The USRP-induced surface work-hardening had only a minor impact on the FF resistance. View Full-Text
Keywords: Ti-6Al-4V alloy; ultrasonic surface rolling process (USRP); compressive residual stress; surface work-hardening; fretting fatigue (FF) Ti-6Al-4V alloy; ultrasonic surface rolling process (USRP); compressive residual stress; surface work-hardening; fretting fatigue (FF)
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Liu, C.; Liu, D.; Zhang, X.; Yu, S.; Zhao, W. Effect of the Ultrasonic Surface Rolling Process on the Fretting Fatigue Behavior of Ti-6Al-4V Alloy. Materials 2017, 10, 833.

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