Kou kouzou rombunshuu
Online ISSN : 1884-0329
Print ISSN : 1880-9928
ISSN-L : 1880-9928
A Preliminary Study of Applicability of Laser Peening to Structural Steels with Various Strength
Yoshihiro SAKINOYuji SANOYou-Chul KIM
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2011 Volume 18 Issue 69 Pages 69_61-69_70

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Abstract

Laser peening is an innovative surface enhancement technology to introduce a compressive residual stress on metallic materials. In this paper, residual stress, Vickers hardness and surface profile of four grades of structural steel were examined to clarify the applicability of laser peening. The results obtained are summarized as follows. 1) Laser peening conditions, which can generate large and deep compressive residual stress, were established for 400 to 780MPa grade steels. 2) Compressive residual stress becomes deeper with the increase of material strength, whereas the hardened layer becomes shallower in the same laser peening conditions. 3) The surface got dented by 10 to 30μm from the initial surface and the surface roughness (Ra) became 3.5 to 13μm after laser peening.

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© 2011 Japanese Society of Steel Construction
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