Introduction of Compressive Residual Stress Into Alloy Steel by Cavitation Peening Using Laser Cavitation

Author:  Hitoshi Soyama
Source:  ICSP-13
Doc ID:  2017105
Year of Publication:  2017
Abstract:  
Introduction: In case of submerged laser peening, a bubble is initiated after laser abrasion, and developed then collapsed. The bubble produces impact at bubble collapse. As the bubble behaves similar to cavitation bubble, the bubble generated at submerged laser peening is called as “laser cavitation” in the present paper.It was believed that the shock wave induced by the laser abrasion produces peening effect in submerged laser peening, as the pressure induced by the laser abrasion was larger than that of laser cavitation by a submerged shock wave sensor [1]. However, it has been reported that the impact induced by laser cavitation collapse is larger than that of laser abrasion, when pressure wave was measured by hydrophone [2] and pressure wave in the material was measured by polyvinylidene fluoride PVDF sensor [3], [4]. Thus, it might be possible to peen the materials by laser cavitation.