Macro, Micro, and Nano Level Analysis of Cavitation Damage Mechanism in FCC Materials

Hutli, Ezddin and Bonyar, Attila and Nedeljkovic, Milos (2016) Macro, Micro, and Nano Level Analysis of Cavitation Damage Mechanism in FCC Materials. Key Engineering Materials. ISSN 1013-9826 (In Press)

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Abstract

The aim of this paper is to demonstrate the analysis of cavitation damage mechanism in FCC (Face Centered Cub ic ) materials , and to establish a possible application of the cavitation phenomenon as an efficient method to modify surface properties. Three FCC materials ( c opper, AlMg - alloy and stainless steel ( St.St.316 ) ) were subjected to high speed submerged cavitating jets under certain working conditions, for different time periods. The force generated by cavitation is employed to deform and to damage the surface in scales ranging from nano to micro and macro . The target surface s were investigated with various techniqu es. Results indicate that at short exposure times, the observed characteristic features in the microstructure – hills, holes and wavy configuration – can be related to the start of the plastic deformation of the specimen surface. By increasing the exposur e time , the surface s bec a me eroded, the damaged area is characterized by many rings , with different degrees of surface roughness . The results related to the early stage of cavitation damage demonstrate the possibility to us e cavitation bubbles as a micro/ n ano fabrication method for the surface preparation/modification or for example shoot - less surface peening.

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