Influence of Variously Modified Surface of Aluminium Alloy on the Effect of Pulsating Water Jet

Klich, Jiří; Klichová, Dagmar; Foldyna, Vladimír; Hlaváček, Petr; Foldyna, Josef

doi:10.5545/sv-jme.2017.4356

Cited by 16 publications

(5 citation statements)

References 11 publications

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“…Foldyna et al [ 25 ] focused on the effect of increasing the number of impingements on the surface of stainless steel treated with a PWJ. The number of impingements ranged from 2125 to 106,250.…”

Section: Introductionmentioning

confidence: 99%

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Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet

et al. 2021

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This article deals with the effect of periodically acting liquid droplets on the polished surfaces of AISI 316L stainless steel and Ti6Al4V titanium alloy. These materials were exposed to a pulsating water jet produced using an ultrasonic sonotrode with an oscillation frequency of 21 kHz placed in a pressure chamber. The only variable in the experiments was the time for which the materials were exposed to water droplets, i.e., the number of impingements; the other parameters were kept constant. We chose a low number of impingements to study the incubation stages of the deformation caused by the pulsating water jet. The surfaces of the specimens were studied using (1) confocal microscopy for characterizing the surface profile induced by the water jet, (2) scanning electron microscopy for detailed surface observation, and (3) transmission electron microscopy for detecting the changes in the near-surface microstructure. The surface described by the height of the primary profile of the surface increased with the number of impingements, and was substantially more intense in the austenitic steel than in the Ti alloy. Irregular surface depressions, slip lines, and short cracks were observed in the Ti alloy, whereas pronounced straight slip bands formed in the austenitic steel. The dislocation density near the surface was measured quantitatively, reaching high values of the order of 1014 m−2 in the austenitic steel and even higher values (up to 3 × 1015 m−2) in the Ti alloy. The origins of the mentioned surface features differed in the two materials: an intense dislocation slip on parallel slip planes for the Ti alloy and mechanical twinning combined with dislocation slip for the austenitic steel.

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Section: Introductionmentioning

confidence: 99%

“…The last stage was recognized by the deepening of the groove. These stages can be compared to the stages observed by Foldyna [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet

et al. 2021

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“…The speeds tested were 0.5, 0.75, 1, 2, and 4 mm/s. The highest roughness was measured at the lowest feed rate; on the contrary, at the highest feed rate, the roughness did not change much for all samples [25].…”

Section: Introductionmentioning

confidence: 71%

Ultrasonic Pulsating Water Jet Peening: Influence of Pressure and Pattern Strategy

et al. 2021

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Peening techniques are nowadays attracting more research attention due to their association with the extending of the service life and improving surface texture of engineering components. Ultrasonic pulsating water jet peening represents a new way of mechanical surface treatment. Accelerated water droplets via hammer effect cause small elastic-plastic deformations on the surface. This work deals with peening of aluminum alloy using an ultrasonic pulsating water jet, where periodically acting water droplets were used as the peening medium. The aim of the work was the feasibility study of the peening process and to observe the effects of pressure (p = 10, 20 and 30 MPa) and pattern trajectory (linear hatch and cross hatch). The peened surfaces were analyzed by the surface roughness profile parameters Ra and Rz and the microhardness along the peening axis into the material. Graphically processed results show a clear increase of measured values with increasing pressure (p = 10, 20 and 30 MPa), where the roughness values ranged from 1.89 µm to 4.11 µm, and the microhardness values ranged from 43.3 HV0.005 to 47 HV0.005, as compared to 40.3 HV0.005 obtained for the untreated sample. The achieved results indicate potential using of an ultrasonic pulsating water jet as a new method of surface treatment of metals. By controlled distribution of water droplets, it is possible to achieve a local distribution of surface roughness, and at the same time, strengthening of the subsurface layers in the material without thermal influence on the material.

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“…In the case of PWJ, the predominance of the lateral jetting [32] was responsible for causing these surface features. It also reflects the effectiveness of the PWJ over CWJ in disintegrating ductile materials [25,33].…”

Section: Microstructural Morphology and Topographymentioning

confidence: 99%

“…A series of water pulses periodically hits the surface and erodes the material in different erosion modes [24]. These modes have been explained parametrically [25,26]. Some works [27][28][29] focusing on the investigation of the technology of ultrasonically excited water flow have, primarily investigated the technological parameters or were also oriented toward the characterization of the material.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Continuous and Pulsating Water Jet during Piercing of Ductile Material

et al. 2023

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More efficient ways to process materials are constantly being sought, even in the case of continuous water flow technology, which acts on materials mainly by stagnant pressure. An alternative method is an ultrasound-stimulated pulsating water jet, the basis of which is the repeated use of impact pressure, which reduces the time interval for mechanical relaxation. This article focuses on a comparative study from the point of view of water mass flow rate on material penetration and its integrity. Relatively low pressures (p = 20, 30, and 40 MPa) with varying nozzle diameters (d = 0.4 and 0.6 mm) were used to identify the effectiveness of the pulsating water jet. The time exposure of the jet at a fixed place was varied from t = 0.5 to 5 s for each experimental condition. The results showed that with an increase in the pressure and diameter values, the disintegration depth increased. In addition, the surface topography and morphology images showed signs of ductile erosion in the form of erosion pits, upheaved surfaces, and crater formation. The microhardness study showed an increase of 10% subsurface microhardness after the action of the pulsating water jet as compared to the original material.

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Influence of Variously Modified Surface of Aluminium Alloy on the Effect of Pulsating Water Jet

Cited by 16 publications

References 11 publications

Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet

Surface and Subsurface Analysis of Stainless Steel and Titanium Alloys Exposed to Ultrasonic Pulsating Water Jet

Ultrasonic Pulsating Water Jet Peening: Influence of Pressure and Pattern Strategy

Comparison of Continuous and Pulsating Water Jet during Piercing of Ductile Material

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