Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy
Laser peening without coating (LPwC) using a palmtop-sized microchip laser has improved the residual stresses (RSs) and fatigue properties of A7075 aluminum alloy. Laser pulses with a wavelength of 1.06 μm and duration of 1.3 ns from a Q-switched Nd:YAG microchip laser were focused onto A7075 alumin...
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MDPI AG
2021-10-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/11/1716 |
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| author | Yuji Sano Kiyotaka Masaki Yoshio Mizuta Satoshi Tamaki Tomonao Hosokai Takunori Taira |
| author_facet | Yuji Sano Kiyotaka Masaki Yoshio Mizuta Satoshi Tamaki Tomonao Hosokai Takunori Taira |
| author_sort | Yuji Sano |
| collection | DOAJ |
| description | Laser peening without coating (LPwC) using a palmtop-sized microchip laser has improved the residual stresses (RSs) and fatigue properties of A7075 aluminum alloy. Laser pulses with a wavelength of 1.06 μm and duration of 1.3 ns from a Q-switched Nd:YAG microchip laser were focused onto A7075 aluminum alloy samples covered with water. X-ray diffraction revealed compressive RSs on the surface after irradiation using laser pulses with an energy of 1.7 mJ, spot diameter of 0.3 mm, and density of 100–1600 pulse/mm<sup>2</sup>. The effects were evident to depths of a few hundred micrometers and the maximum compressive RS was close to the yield strength. Rotation-bending fatigue experiments revealed that LPwC with a pulse energy of 1.7 mJ significantly prolonged the fatigue life and increased the fatigue strength by about 100 MPa with 10<sup>7</sup> fatigue cycles. The microchip laser used in this study is small enough to fit in the hand or be mounted on a robot arm. The results may lead to the development of tools that extend the service life of various metal parts and structures, especially outdoors where conventional lasers are difficult to apply. |
| first_indexed | 2024-03-10T05:17:09Z |
| format | Article |
| id | doaj.art-d2e9f14a986e42068f30d615612c211b |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T05:17:09Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-d2e9f14a986e42068f30d615612c211b2023-11-23T00:22:28ZengMDPI AGMetals2075-47012021-10-011111171610.3390/met11111716Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum AlloyYuji Sano0Kiyotaka Masaki1Yoshio Mizuta2Satoshi Tamaki3Tomonao Hosokai4Takunori Taira5Division of Research Innovation and Collaboration, Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki 444-8585, JapanDepartment of Mechanical Systems Engineering, National Institute of Technology, Okinawa College, Nago 905-2192, JapanDepartment of Quantum Beam Physics, SANKEN, Osaka University, Osaka 567-0047, JapanLAcubed Co., Yokohama 220-0012, JapanDepartment of Quantum Beam Physics, SANKEN, Osaka University, Osaka 567-0047, JapanDivision of Research Innovation and Collaboration, Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki 444-8585, JapanLaser peening without coating (LPwC) using a palmtop-sized microchip laser has improved the residual stresses (RSs) and fatigue properties of A7075 aluminum alloy. Laser pulses with a wavelength of 1.06 μm and duration of 1.3 ns from a Q-switched Nd:YAG microchip laser were focused onto A7075 aluminum alloy samples covered with water. X-ray diffraction revealed compressive RSs on the surface after irradiation using laser pulses with an energy of 1.7 mJ, spot diameter of 0.3 mm, and density of 100–1600 pulse/mm<sup>2</sup>. The effects were evident to depths of a few hundred micrometers and the maximum compressive RS was close to the yield strength. Rotation-bending fatigue experiments revealed that LPwC with a pulse energy of 1.7 mJ significantly prolonged the fatigue life and increased the fatigue strength by about 100 MPa with 10<sup>7</sup> fatigue cycles. The microchip laser used in this study is small enough to fit in the hand or be mounted on a robot arm. The results may lead to the development of tools that extend the service life of various metal parts and structures, especially outdoors where conventional lasers are difficult to apply.https://www.mdpi.com/2075-4701/11/11/1716laser shock peeningLPwCmicrochip laserX-ray diffractionfatigue |
| spellingShingle | Yuji Sano Kiyotaka Masaki Yoshio Mizuta Satoshi Tamaki Tomonao Hosokai Takunori Taira Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy Metals laser shock peening LPwC microchip laser X-ray diffraction fatigue |
| title | Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy |
| title_full | Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy |
| title_fullStr | Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy |
| title_full_unstemmed | Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy |
| title_short | Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy |
| title_sort | effects of laser peening with a pulse energy of 1 7 mj on the residual stress and fatigue properties of a7075 aluminum alloy |
| topic | laser shock peening LPwC microchip laser X-ray diffraction fatigue |
| url | https://www.mdpi.com/2075-4701/11/11/1716 |
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