Vol.14, No.3, 2014, pp. 155–160
 UDC 620.187:669.245`26

TRANSPARENT LAYER INFLUENCE ON MICROSTRUCTURAL CHANGES OF NIMONIC 263 IN LASER SHOCK PEENING PROCESSING

Sanja Z. Petronić

University of Belgrade, Faculty of Mechanical Engineering – Innovation Centre, spetronic@mas.bg.ac.rs

Abstract

Laser shock peening (LSP) is one of the promising surface treatments for improving the fatigue, corrosion, wear resistance and hardness of the material. In this paper, LSP is applied on the Nimonic 263 superalloy surface. The changes in microstructure and in surface topography are observed and analysed by SEM, profilometer and microhardness tester. LSP is carried out with and without transparent layer, with the aim to investigate the influence of the transparent layer on microstructural changes. In this paper, the optimal process parameters are determined. Also, it is shown that the laser processing of the material in the presence of the transparent layer results in a more favourable microstructure and surface topography compared to the laser treatment without the transparent layer.

Keywords: laser shock peening, superalloy, SEM, EDS, profilometry, microhardness

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