• Chinese Journal of Lasers
  • Vol. 34, Issue s1, 74 (2007)
[in Chinese]*, [in Chinese], [in Chinese], and [in Chinese]
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  • [in Chinese]
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    [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Controlled Laser Shock Peening Technology[J]. Chinese Journal of Lasers, 2007, 34(s1): 74 Copy Citation Text show less

    Abstract

    A new technology-controlled laser shock peening which is applied by using a high energy pulsed laser to induce a high amplitude shock wave to make surface modified is introduced. It can improve fatigue life, corrosion and wear resistance of metal part. The fatigue life and the corrosion resistance do not always increase with laser shock peening intensity linealy. Optimal fatigue life and corrosion resistance depend on magnitude and distribution of residual compressive stress, and influence by optimization of various laser processing parameters. Laser processing parameters have a crucial effect on residual stress. Selecting laser processing parameters according to preconcerted fatigue life and corrosion resistance becomes a present subject. Laser shock peening mechanism has a significant relation with the generation of residual stress. In this work, the effect of laser processing parameters such as laser power density, laser beam diameter, laser pulse width on distribution of residual stress, and the relationship between these parameters and residual stress depth are examined. Specimens of QT700-2 are used in this investigation. The magnitude and distribution of the residual stress are measured by using an automatic X-ray diffraction technique. It is observed that while residual compressive stress induced by laser shock peening reach an optimal level, the surface of metal part can obtain optimal fatigue life and corrosion resistance, then optimal combination of laser processing parameters can also be obtained.
    [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Controlled Laser Shock Peening Technology[J]. Chinese Journal of Lasers, 2007, 34(s1): 74
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