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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Autores principales:	Yuji Sano, Kiyotaka Masaki, Yoshio Mizuta, Satoshi Tamaki, Tomonao Hosokai, Takunori Taira
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	laser shock peening LPwC microchip laser X-ray diffraction fatigue Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/d2e9f14a986e42068f30d615612c211b
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spelling	oai:doaj.org-article:d2e9f14a986e42068f30d615612c211b2021-11-25T18:21:26ZEffects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy10.3390/met111117162075-4701https://doaj.org/article/d2e9f14a986e42068f30d615612c211b2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1716https://doaj.org/toc/2075-4701Laser 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.Yuji SanoKiyotaka MasakiYoshio MizutaSatoshi TamakiTomonao HosokaiTakunori TairaMDPI AGarticlelaser shock peeningLPwCmicrochip laserX-ray diffractionfatigueMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1716, p 1716 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	laser shock peening LPwC microchip laser X-ray diffraction fatigue Mining engineering. Metallurgy TN1-997
spellingShingle	laser shock peening LPwC microchip laser X-ray diffraction fatigue Mining engineering. Metallurgy TN1-997 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
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.
format	article
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
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_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_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_sort	effects of laser peening with a pulse energy of 1.7 mj on the residual stress and fatigue properties of a7075 aluminum alloy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d2e9f14a986e42068f30d615612c211b
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Effects of Laser Peening with a Pulse Energy of 1.7 mJ on the Residual Stress and Fatigue Properties of A7075 Aluminum Alloy

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