Abstract
Ultrasonic fatigue tests are carried out on aluminum alloy 6061-T6 in order to analyze the fatigue endurance behavior under artificial pre-corrosion attack by hydrochloric acid for the pH concentrations of 0.47 and 0.80. The pre-corrosion attack is used to simulate the long-time environmental effect and the corresponding decay of fatigue life in regard to non-corroded specimens. Experimental results show that ultrasonic fatigue endurance under these two degrees of pre-corrosion attack decreases dramatically. Furthermore, it is observed that crack initiation is frequently associated with one or several pre-corrosion pitting holes at the specimen surface. Pitting holes are assumed to be semi-hemispherical and the stress concentration factors are evaluated taking into account the size and proximity of two crack initiation pitting holes. The crack growth rates are obtained for the pre-corroded specimens and compared to the non-corroded specimen. Finally, conclusions are listed concerning ultrasonic fatigue endurance of testing specimens, together with the fracture surfaces, crack paths, and crack growth rates.
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Acknowledgments
We want to express our gratitude to the University of Michoacan in Mexico (UMSNH) for the use of the facilities in the development of this work. A special mention of gratitude to CONACYT (The Mexican Counsel for Science and Technology) for the financial support given to this research work.
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Manuscript submitted June 19, 2013.
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Domínguez Almaraz, G.M., Dueñas Aburto, A. & Correa Gómez, E. Ultrasonic Fatigue Endurance of Aluminum Alloy AISI 6061-T6 on Pre-corroded and Non-corroded Specimens. Metall Mater Trans A 45, 280–286 (2014). https://doi.org/10.1007/s11661-013-1983-5
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DOI: https://doi.org/10.1007/s11661-013-1983-5