Nano- and Micro-Scale Surface Modification of FCC Metal Using High Submerged Cavitating Water Jet

Hutli, Ezddin; Nedeljković, Miloš; Radović, Nenad

doi:10.1007/s11468-013-9481-6

Cited by 11 publications

(2 citation statements)

References 10 publications

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“…The high negative skewness and moderate roughness indicates the first phase of plastic deformation after 15 to 30 s exposure with distinguishable bubble collapse sites (holes) on the surface. More details about the mechanism of cavitation damage and the interaction between the bubble collapse and surface of the target materials are presented in our previous publications [18,30].…”

Section: Cavitation Damage and Materials Propertiesmentioning

confidence: 99%

Plastic deformation and modification of surface characteristics in nano- and micro-levels and enhancement of electric field of FCC materials using cavitation phenomenon

Hutli

Bonyár

Oszetzky

et al. 2016

Mechanics of Materials

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The aim of this paper is to demonstrate and establish a possible application of the cavitation phenomenon as an efficient method to modify surface properties. Three FCC (Face Centered Cubic) materials were subjected to high speed submerged cavitating jets under certain working conditions, for time periods between 15 and 1,800 s. The force generated by cavitation is employed to modify the surface roughness in nano and micro scales. The target surface was investigated with digital optical microscopy, atomic force and electrostatic force microscopy (AFM and EFM) and also with a white light interferometer. These different observation techniques 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. Longer exposure times inevitably result in a greater number of jet specimen interactions leading to specimen erosion and fracture. The results demonstrate the possibility to use cavitation bubbles as a micro-nanofabrication method for the surface preparation/modification or shoot-less surface peening. EFM results present a possibility of using cavitation as tool to enhance the electrostatic properties of a metal surface by modifying its roughness. The degree of enhancement depends on the material properties.

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Section: Cavitation Damage and Materials Propertiesmentioning

confidence: 99%

Plastic deformation and modification of surface characteristics in nano- and micro-levels and enhancement of electric field of FCC materials using cavitation phenomenon

Hutli

Bonyár

Oszetzky

et al. 2016

Mechanics of Materials

Self Cite

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“…Since then, the application of shot peening to the surface treatment of materials has become more and more extensive [14][15][16]. Hutli et al verified that the cavitation water jet is an effective method to improve the surface properties of materials, and the force generated by the cavitation can change the surface roughness of materials on the nanoscale and micron scale [17,18]. Tsuda et al used CWJP to treat steel gear shafts with complex shapes and structures.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of 7075 Aluminum Alloy Strengthened by Cavitation Water Jet Peening at Different Scanning Speeds

Yang

Gao²,

Wang

et al. 2022

Crystals

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Shot peening technologies can improve the performance of materials and extend the service life of parts. Cavitation water jet peening (CWJP) is a new shot peening technology that uses the shear effect of a high-speed jet in a submerged environment to produce a cluster of bubbles, thereby achieving a significant increase in impact performance. In this paper, CWJP was used to strengthen the surface of the 7075 aluminum alloy (Al7075), and the effects of CWJP with different scanning speeds on its microstructure and mechanical properties were investigated. The morphology evolution revealed that the plastic deformation of the sample surface became more serious and the surface roughness increased with the decrease in scanning speed. The distribution of residual stress and microhardness along the depth direction of the Al7075 was measured before and after the CWJP impact, and it was found that CWJP causes work hardening on the surface of the Al7075 and can convert the subsurface tensile stress of the Al7075 into compressive stress. The mechanism of grain refinement of the Al7075 during plastic deformation was systematically revealed. Therefore, CWJP can effectively improve the surface properties of the 7075 aluminum alloy.

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Automatic Edge Detection Applied to Cavitating Flow Analysis: Cavitation Cloud Dynamics and Properties Measured through Detected Image Regions

Hutli

Petrović

Nedeljković

et al. 2021

Flow Turbulence Combust

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In a cavitating water jet, cavity clouds emerge and collapse with an unsteady, but periodic tendency where the frequencies depend on the working conditions. The presented work aims at examining and analyze the dynamic behavior and properties of the clouds under different circumstances. Computer vision and image processing were introduced as tools to define the cavitation clouds based on the Contour Recognition technique. A Canny operator and Otsu threshold fragmenting methods were used. The use of these methods allows for a better understanding of the cavitating jet clouds' behavior based on the pixel intensities and shows that for an arbitrary cloud the surface itself has a dynamic feature and depends on the cavity composition. The clouds' properties could be measured and correlated to the applied working conditions. Also, the oscillation frequencies of the area of the clouds could be determined. The analysis shows that the quality of the obtained results depends mainly on the input threshold values separating the foreground and background pixels. The difficulty of defining the threshold value is discussed in the paper, as well as the validity of using the Contour Recognition technique in this field.

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Nano- and Micro-Scale Surface Modification of FCC Metal Using High Submerged Cavitating Water Jet

Cited by 11 publications

References 10 publications

Plastic deformation and modification of surface characteristics in nano- and micro-levels and enhancement of electric field of FCC materials using cavitation phenomenon

Plastic deformation and modification of surface characteristics in nano- and micro-levels and enhancement of electric field of FCC materials using cavitation phenomenon

Performance Analysis of 7075 Aluminum Alloy Strengthened by Cavitation Water Jet Peening at Different Scanning Speeds

Automatic Edge Detection Applied to Cavitating Flow Analysis: Cavitation Cloud Dynamics and Properties Measured through Detected Image Regions

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