[7a-S45-1~8] 3.7 Laser processing

[7a-S45-3] Residual stress field by a high power laser

〇Yoichiro Hironaka¹, Eisuke Miura³, Ryunosuke Kuroda³, Kohei Miyanishi¹, Keisuke shigemori¹, Takeshi Matsuoka², Norimasa Ozaki², Ryosuke Kodama¹, Takashi Kurita⁴, Norio Kurita⁴, Takeshi Watari⁴, Yoshio Mizuta⁴, Yuki Kabeya⁴ (1.ILE, 2.Osaka Univ., 3.AIST, 4.HPK)

Keywords:Pulsed Laser, peening

Various reforming processing is studied by corrosion-resistant improvement by surface modification, stress-corrosion cracking prevention by residual stress field and improvement of the fatigue strength aiming at high quality-ization of the structure material of the metal. Using the super-high pressure a laser peening technique generates by a laser ablation which make a shock wave transmitted inside the material and restrain development of a crack and destruction by generation of the residual stress field. A laser peening technique, local processing and, non-contact process, remains compressive stress layer formation to the material depth is possible than a conventional shot peening with the feature. We investigated at the large area irradiation and the long pulse laser irradiation which become possible to use a high pulse energy laser (>100 J) by this research and an advancing new search of a laser machining method and explication of processing to compressive stress layer formation to the material depth from a method in the past.