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Enhancement of Surface Properties by Laser Peening Without Coating

[+] Author Affiliations
Yuji Sano

Toshiba Corporation, Yokohama, Japan

Igor Altenberger, Berthold Scholtes

University of Kassel, Kassel, Germany

Kiyotaka Masaki, Yasuo Ochi

University of Electro-Communications, Tokyo, Japan

Koichi Akita

Musashi Institute of Technology, Tokyo, Japan

Paper No. PVP2006-ICPVT-11-93303, pp. 179-184; 6 pages
doi:10.1115/PVP2006-ICPVT-11-93303
From:
  • ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference
  • Volume 7: Operations, Applications, and Components
  • Vancouver, BC, Canada, July 23–27, 2006
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4758-6 | eISBN: 0-7918-3782-3
  • Copyright © 2006 by ASME

abstract

Laser peening without coating (LPwC) has been applied to water-immersed materials using a water-penetrable light of a Q-switched and frequency-doubled Nd:YAG laser. Compressive residual stress of several hundred MPa was introduced at the surface of the materials. High-cycle fatigue (HCF) properties were evaluated through rotating-bending or push-pull type testing for an austenitic stainless steel (SUS316L), a titanium alloy (Ti-6Al-4V) and a cast aluminum alloy (AC4CH). LPwC prolonged the fatigue lives significantly, in spite of the increase in surface roughness ascribed to the ablative interaction of laser pulses with the materials.

Copyright © 2006 by ASME

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