Laser peening without coating on aluminum alloy Al-6061-T6 using low energy Nd:YAG laser

Warm laser shock peening without coating induced phase transformations and pinning effect on fatigue life of low-alloy steel

“…Subsequently, the WLSP treated specimen are slowly cooled from the processing temperature to avoid RS relaxation [14,[18][19][20]51,52]. The authors earlier work investigated that direct laser ablation on the mirror polished surface works efficiently but, an anisotropic problem during the shock wave production is identified [5,21,24,27]. The reason is mirror polished surface would not act as an opaque medium.…”

“…LSPwC method of producing high compressive RS works efficiently with low energy lasers. Also, it is economical for commercial applications [5,[21][22][23][24].…”

Improvement in fatigue life of Al 7475-T7351 alloy specimens by applying ultrasonic and microshot peening

“…Thus, several mechanical processes are being studied in order to introduce compressive residual stresses on the material surface and deeper layers [5][6][7][8][9][10][11]. Shot peening is a widely used mechanical surface treatment to improve the fatigue life of metallic components.…”

Experimental investigation of laser peening on Ti17 titanium alloy for rotor blade applications

“…Compared with conventional surface treatment methods, laser peening is very effective in improving metallic material properties 16,17 , and could overcome the above drawbacks. Laser peening has become the state-of-the-art to generate deeper than 1mm of compressive stresses into the treated components 18 , without adversely affecting surface roughness of the components 19 .…”