Role of Ultrasonic Shot Peening in Environmental Hydrogen Embrittlement Behavior of 7075-T6 Alloy
| Autor: | Masoud Moshtaghi, Mahdieh Safyari |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Science (General) Hydrogen transgranular fracture Transgranular fracture chemistry.chemical_element ultrasonic shot peening Intergranular fracture Q1-390 hydrogen embrittlement chemistry Residual stress Ultimate tensile strength Ultrasonic sensor Grain boundary intergranular fracture Composite material aluminum alloy Hydrogen embrittlement |
| Zdroj: | Hydrogen, Vol 2, Iss 20, Pp 377-385 (2021) Hydrogen Volume 2 Issue 3 Pages 20-385 |
| ISSN: | 2673-4141 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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