We compared the results of femtosecond laser peening obtained at different condition (in air without coating, in water and in air with coating) and by different overlap ratio. Austenic stainless steel was used as the test sample. The Vickers microhardness was used to probe the work hardening and a 3D profilometer was used to evaluate the surface roughness. The great increase in hardness was obtained for the sample in air and by using an overlap of 50%.
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