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Effects of Laser Peening on Fatigue Crack Behaviors in Pre-Cracked Cast Aluminum Alloy

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Abstract:

In order to investigate effects of low energy laser peening (LP) without protective coating on surface fatigue crack growth behavior, rotating bending fatigue tests were carried out on cast Al-Si-Mg aluminum alloy with a pre-cracked round bar type specimens. As the results, the fatigue crack growth was restrained by the compressive residual stress induced by laser peening treatment. And also, the three dimensional (3D) image of surface fatigue cracks was reconstructed by using a micro computed tomography (μCT) with phase contrast technique. It was also shown that the surface crack growth was restrained for the laser peened materials.

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Periodical:

Key Engineering Materials (Volumes 345-346)

Pages:

255-258

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.345-346.255

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Online since:

August 2007

Authors:

Yasuo Ochi, Kiyotaka Masaki, Takashi Matsumura, Yuji Sano, Koichi Akita, Kentaro Kajiwara

Keywords:

Cast Aluminum Alloy, Fatigue Crack Growth (FCG), Laser Peening, Micro Computed Tomography (μ-CT)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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