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Article

Role of Ultrasonic Shot Peening in Environmental Hydrogen Embrittlement Behavior of 7075-T6 Alloy

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Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai 980-8577, Japan
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Graduate School of Engineering, Tohoku University, Aramaki Aza Aoba 6-6, Aoba-Ku, Sendai 980-8579, Japan
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Department of General and Analytical Chemistry, University of Leoben, Franz Josef-Straße 18, 8700 Leoben, Austria
*
Authors to whom correspondence should be addressed.
Academic Editor: George E. Marnellos
Hydrogen 2021, 2(3), 377-385; https://doi.org/10.3390/hydrogen2030020
Received: 15 August 2021 / Revised: 1 September 2021 / Accepted: 10 September 2021 / Published: 11 September 2021
(This article belongs to the Special Issue Feature Papers in Hydrogen)
The effect of ultrasonic shot peening on the environmental hydrogen embrittlement behavior of the 7075-T6 aluminum alloy is investigated. The 7075-T6 tensile specimens were treated by ultrasonic shot peening for 50 s. Surface residual stress and the depth of residual stress under the surface were evaluated using an X-ray diffractometer. Then, the specimens were tensile tested in humid air and dry nitrogen gas by the slow strain rate technique. The results showed that the ultrasonic shot-peened specimen has a superior hydrogen embrittlement resistance. Further, the ultrasonic shot peening changes the fracture mode from an intergranular fracture mode to the transgranular one. It was suggested that ultrasonic shot-peening has two effects on hydrogen embrittlement behavior; the distribution of hydrogen inside the surface layer by introducing dislocations/vacancies as hydrogen traps and reducing the normalized amount of hydrogen trapped per unit length of the grain boundary. View Full-Text
Keywords: aluminum alloy; hydrogen embrittlement; ultrasonic shot peening; transgranular fracture; intergranular fracture aluminum alloy; hydrogen embrittlement; ultrasonic shot peening; transgranular fracture; intergranular fracture
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MDPI and ACS Style

Safyari, M.; Moshtaghi, M. Role of Ultrasonic Shot Peening in Environmental Hydrogen Embrittlement Behavior of 7075-T6 Alloy. Hydrogen 2021, 2, 377-385. https://doi.org/10.3390/hydrogen2030020

AMA Style

Safyari M, Moshtaghi M. Role of Ultrasonic Shot Peening in Environmental Hydrogen Embrittlement Behavior of 7075-T6 Alloy. Hydrogen. 2021; 2(3):377-385. https://doi.org/10.3390/hydrogen2030020

Chicago/Turabian Style

Safyari, Mahdieh, and Masoud Moshtaghi. 2021. "Role of Ultrasonic Shot Peening in Environmental Hydrogen Embrittlement Behavior of 7075-T6 Alloy" Hydrogen 2, no. 3: 377-385. https://doi.org/10.3390/hydrogen2030020

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