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Mechanism of Healing Fatigue Damage by Pulsed Laser Surface Irradiation for Polycrystalline Copper Film

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Abstract:

The mechanism of healing fatigue damage was investigated by pulsed laser surface irradiation for polycrystalline copper film, X-ray Diffraction(XRD), optical microscopic and scanning electron microscopy(SEM). The results indicate that surface melting and grain refinement were found in the melted surface layer. Tensile residual stresses were introduced in the resolidified surface layer due to laser surface melting which produced deleterious effect on fatigue property. Remelting and grain refinement in the surface layer is mainly responsible for healing fatigue damage and fatigue life improvement. The fatigue damage could be healed completely or partly by laser surface irradiation under the proper parameters of laser treatment for the specimens.

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Periodical:

Advanced Materials Research (Volumes 538-541)

Pages:

1866-1869

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.538-541.1866

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Cite this paper

Online since:

June 2012

Authors:

Chong Gang Ren, De Guang Shang, Chang Gang Nai, Lu Wang, Tao Chen

Keywords:

Healing Fatigue Damage, Laser Surface Irradiation, Metallograph, Residual Stress

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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