Laser shock peening process with low pulse energy of 316L stainless steel

doi:10.13251/j.issn.0254-6051.2022.09.016

Abstract

Abstract: Using 316L stainless steel as the model material, the low-energy high-repetition rate laser shock peening process was systematically studied. A concept of laser spot coverage ratio was established. For the spot diameter d between 0.4-0.8 mm, the saturation coverage ratio is 6-7, under which the matching relationship between the manipulator movement rate v and the spot diameter d is v=70d. The maximum residual compressive stress increases with the decrease of the spot diameter. When the spot diameter d is 0.4 mm, the maximum residual compressive stress is 662 MPa, and the depth of the residual compressive stress affected layer is 565 μm. The surface roughness of the laser shock peened area does not increase significantly, but there is a step with certain height between the laser shocked and unshocked zones. At a laser power density of 1.59 GW/cm², the step height is 23 μm.

Key words: laser shock, low energy, residual stress, coverage ratio

CLC Number:

V261.8
TG178

Qin Enwei, Liu Lixia, Liu Chengwei, Lu Haifeng, Wu Shuhui. Laser shock peening process with low pulse energy of 316L stainless steel[J]. Heat Treatment of Metals, 2022, 47(9): 92-97.

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