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Metals 2016, 6(3), 41;

Picosecond Laser Shock Peening of Nimonic 263 at 1064 nm and 532 nm Wavelength

Innovation Center, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11000 Belgrade, Serbia
Faculty of Information Technology, Faculty of Management, Metropolitan University, Tadeusa Koscuska 63, 11000 Belgrade, Serbia
Central Institute for Conservation in Belgrade, Terazije 26, 11000 Belgrade, Serbia
Vinca Institute of Nuclear Sciences, University of Belgrade, PO Box 522, 11001 Belgrade, Serbia
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Patrice Peyre
Received: 12 November 2015 / Revised: 3 February 2016 / Accepted: 5 February 2016 / Published: 23 February 2016
(This article belongs to the Special Issue Laser Shock Processing on Metal)
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The paper presents a study on the surface modifications of nickel based superalloy Nimonic 263 induced by laser shock peening (LSP) process. The process was performed by Nd3+:Yttrium Aluminium Garnet (YAG) picosecond laser using the following parameters: pulse duration 170 ps; repetition rate 10 Hz; pulse numbers of 50, 100 and 200; and wavelength of 1064 nm (with pulse energy of 2 mJ, 10 mJ and 15 mJ) and 532 nm (with pulse energy of 25 mJ, 30 mJ and 35 mJ). The following response characteristics were analyzed: modified surface areas obtained by the laser/material interaction were observed by scanning electron microscopy; elemental composition of the modified surface was evaluated by energy-dispersive spectroscopy (EDS); and Vickers microhardness tests were performed. LSP processing at both 1064 nm and 532 nm wavelengths improved the surface structure and microhardness of a material. Surface morphology changes of the irradiated samples were determined and surface roughness was calculated. These investigations are intended to contribute to the study on the level of microstructure and mechanical properties improvements due to LSP process that operate in a picosecond regime. In particular, the effects of laser wavelength on the microstructural and mechanical changes of a material are studied in detail. View Full-Text
Keywords: laser modification; Nd:YAG; shock peening; Nimonic; superalloy laser modification; Nd:YAG; shock peening; Nimonic; superalloy

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Petronic, S.; Sibalija, T.; Burzic, M.; Polic, S.; Colic, K.; Milovanovic, D. Picosecond Laser Shock Peening of Nimonic 263 at 1064 nm and 532 nm Wavelength. Metals 2016, 6, 41.

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