Fretting Fatigue Behavior of Cavitation Shotless Peened Ti–6Al–4V |
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Authors: | Hyukjae Lee Shankar Mall Hitoshi Soyama |
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Affiliation: | (1) Center for Green Materials Technology, Andong National University, Andong, Kyungbuk, 760-745, South Korea;(2) Department of Aeronautics and Astronautics, Air Force Institute of Technology (AFT/ENY), Bldg 640, Hobson Way, Wright-Patterson Air Force Base, OH 45433, USA;(3) Department of Mechanical Engineering, Tohoku University, Aoba-Ku, Sendai 980-8579, Japan; |
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Abstract: | Fretting fatigue behavior of cavitation shotless peened (CSP) titanium alloy, Ti–6Al–4V was investigated. Constant amplitude
fretting fatigue tests were conducted at several maximum stress levels, σmax, ranging from 400 to 555 MPa with a stress ratio of 0.1. Test results showed that the fretting fatigue life was enhanced
by CSP treatment as compared to the unpeened specimen, but the enhancement was not as large as that from the shot-peening
treatment. Residual stress measurements by X-ray diffraction method before and after fretting test showed that residual compressive
stress was relaxed during fretting fatigue. Before fretting, CSP specimen had higher compressive residual stress on the surface
than the shot-peened specimen. However, greater residual stress relaxation occurred in CSP specimen such that the relaxed
compressive residual stress profile near the contact surface of CSP specimen was lower than that of shot-peened specimen.
This lower compressive residual stress from fretting fatigue was the reason for shorter fretting fatigue life of CSP specimen
as compared to shot-peened specimen at the applied stress level. |
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