Picosecond Laser Shock Peening of Nimonic 263 at 1064 nm and 532 nm WavelengthReportar como inadecuado




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1

Innovation Center, Faculty of Mechanical Engineering, University of Belgrade, Kraljice Marije 16, 11000 Belgrade, Serbia

2

Faculty of Information Technology, Faculty of Management, Metropolitan University, Tadeusa Koscuska 63, 11000 Belgrade, Serbia

3

Central Institute for Conservation in Belgrade, Terazije 26, 11000 Belgrade, Serbia

4

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

Abstract 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





Autor: Sanja Petronic 1,†,* , Tatjana Sibalija 2,†, Meri Burzic 1, Suzana Polic 3, Katarina Colic 1 and Dubravka Milovanovic 4,†

Fuente: http://mdpi.com/



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