Application of Indirect Laser Peening to SUS304 Stainless Steel

Abstract:

Indirect laser peening applied to the substrate of austenitic stainless steel with the sheet of similar material. Effects of indirect laser peening condition on the formation of the dimple and the residual stress were investigated in this paper. Shape of the dimple and distribution of the residual stress were measured by laser microscope and X-ray diffraction, respectively. It was observed by the microscope that clean substrate surface of as-received state kept after indirect laser peening because of protection by the sheet. However, fracture of sheet occurred slightly in high pulse energy condition. The diameter and the depth of the dimple by indirect laser peening increased with the increase of laser power. Efficiency of dimple formation decreased with the increase of pulse energy. Affective condition region of indirect laser peening with a combination between the substrate and the sheet of austenitic stainless steel may be limited below the laser power density of 10GW/cm². It was confirmed that indirect laser peening induced compressive residual stress in the substrate. One of peak of compressive residual stress in residual stress distribution existed near the bottom of the dimple. Residual stress distribution which was produced by indirect laser peening may affect change of quasi bending modulus which was obtained by three-point bending test.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 2316-2321
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.2316
• Online since: May 2014
• Authors: Hiroshi Kawakami*, Akiyoshi Kondo, Muneharu Kutsuna, Kiyotaka Saito, Hiroki Inoue, Hitoshi Ozaki, Jippei Suzuki
• Keywords: Dimple, Indirect Laser Peening, Laser Application, Residual Stress Distribution, Shock Wave, Stainless Steel (SS)

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DOI: 10.4028/www.scientific.net/msf.638-642.3302