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Effect of Laser Shock Peening Without Coating on Surface Morphology and Mechanical Properties of Nickel Alloy
Aniket Kulkarni, S. Prabhakaran, Siddarth Chettri and S. Kalainathan

This paper delineates the effects of low energy laser shock peening (LSP) without coating on Monel K-400 specimen. Comparative study of X-ray diffraction (XRD) analysis of the treated specimen with untreated specimen suggests the presence of compressive residual stress and grain refinement. The crystalline size has been calculated for peened and unpeened samples using the Scherrer’s equation from the XRD data. The residual stress analysis was carried out using the XRD sin2 Ψ method. The results indicate high amount of compressive residual stress has been induced in the specimen after the LSP process. The surface topography result dictates that there is a considerable increase in the surface roughness after the laser peening process. The hardness profile of the material was increased from a 144.5 to 150.7 HV.

Keywords: Laser shock peening without coating (LSPwC); surface morphology; X-ray diffraction (XRD); residual stress; hardness

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