Improvement of fatigue property of A7075 aluminum alloy by laser peening with handheld laser device

Author:  K. Masaki1, Y. Sano2,3,4, Y. Mizuta3 and S. Tamaki4 1 Okinawa College, National Institute of Technology, JAPAN 2 Institute for Molecular Science, Okazaki, JAPAN 3 SANKEN, Osaka University, JAPAN 4 LAcubed Co. Ltd., Yokohama, JAPAN
Source:  ICSP14 Milan
Doc ID:  2022060
Year of Publication:  2022
Abstract:  
In recent years, new handheld pulse laser oscillators have been developed that are much smaller than currently-used pulse laser devices. In this study, in order to investigate the effectiveness as a laser source of laser peening (LP), rotating bending high cycle fatigue test was conducted on referenced pristine and laser-peened aluminum alloys of Al-Zn-Mg-Cu system. As a result, the rotational bending fatigue properties were significantly improved by the LP treatment. The fatigue strength is improved by about 1.5 times, and the fatigue life is extended by about 100 times compared with the fatigue property of the pristine material. It was found that the developed new handheld pulse laser oscillator can be used for the LP treatment. Keywords Laser shock peening, Handheld pulse laser oscillator, Fatigue, Aluminum alloy