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21 April 2017 High-speed micro-scale laser shock peening using a fiber laser (Conference Presentation)
Chenfei Zhang, Leimin Deng, Shiding Sun, Yongfeng Lu
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Proceedings Volume 10092, Laser-based Micro- and Nanoprocessing XI; 1009217 (2017) https://doi.org/10.1117/12.2253754
Event: SPIE LASE, 2017, San Francisco, California, United States
Abstract
Laser shock peening using low-energy nanosecond (ns) fiber lasers was investigated in this study to realize high-speed micro-scale laser shock peening on selected positions without causing surface damage. Due to the employment of a fiber laser with high-frequency and prominent environmental adaptability, the laser peening system is able to work with a much higher speed compared to traditional peening systems using Nd:YAG lasers and is promising for in-situ applications in harsh environments. Detailed surface morphology investigations both on sacrificial coatings and Al alloy surfaces after the fiber laser peening revealed the effects of focal position, pulse duration, peak power density, and impact times. Micro-dent arrays were also obtained with different spot-to-spot distances. Obvious micro-hardness improvement was observed inside the laser-peening-induced microdents after the fiber laser shock peening.
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Chenfei Zhang, Leimin Deng, Shiding Sun, and Yongfeng Lu "High-speed micro-scale laser shock peening using a fiber laser (Conference Presentation)", Proc. SPIE 10092, Laser-based Micro- and Nanoprocessing XI, 1009217 (21 April 2017); https://doi.org/10.1117/12.2253754
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KEYWORDS
Fiber lasers
Laser systems engineering
Aluminum
Laser applications
Nd:YAG lasers
Current controlled current source
Lutetium
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