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Influence of the frequency and flow rate of a pulsating water jet on the wear damage of tantalum
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SYSNO ASEP 0545758 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of the frequency and flow rate of a pulsating water jet on the wear damage of tantalum Author(s) Nag, A. (IN)
Hvizdoš, P. (SK)
Dixit, A. R. (IN)
Petrů, J. (CZ)
Hloch, Sergej (UGN-S) RID, SAI, ORCIDNumber of authors 5 Article number 203893 Source Title Wear. - : Elsevier - ISSN 0043-1648
Roč. 477, July 2021 (2021)Number of pages 10 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords tantalum ; hydrodynamic wear ; ultrasonic ; waterjet ; surface morphology Subject RIV JR - Other Machinery OECD category Mechanical engineering Method of publishing Limited access Institutional support UGN-S - RVO:68145535 UT WOS 000679170600003 EID SCOPUS 85104346368 DOI 10.1016/j.wear.2021.203893 Annotation The present study focuses on the hydrodynamic erosion of tantalum in the form of the disintegration depth when exposed to periodic impingements of water clusters. Discrete water clusters were generated using a pulsating water jet at excitation frequencies of 20 and 40 kHz to modulate the continuous jet into a pulsating jet. The influence of the technological parameters, such as the excitation frequency (20 and 40 kHz), supply pressure (20, 30, and 40 MPa), nozzle diameter (0.3 and 0.5 mm), and time exposure (0.25–128 s), on the erosion depth of tantalum was observed. The disintegration depth trend showed a proportional nature with the number of impingements directed to the tantalum surface keeping all other technological parameters constant. An increase in the water flow rate from 0.76 l/min (p = 20 MPa, d = 0.3 mm) to 3 l/min (p = 40 MPa, d = 0.5 mm), reduces the time exposure required for the initiation of disintegration from 4 s (80,800 impingements with f = 20 kHz) to 1 s (40,600 impingements with f = 40 kHz), respectively. The effect of change in the excitation frequency from 20 to 40 kHz was observed in form of an increase in the erosion depth from 1587 to 1762 μm at p = 40 MPa, d = 0.5 mm, and t = 128 s. The surface morphology observed using scanning electron microscopy revealed erosion features, such as craters, micro-holes, surface upheaving, and tearing, on the tantalum surface. No significant change in the mean micro-hardness values were observed near the periphery of the eroded cavity as compared to original material due to high-density of tantalum which obstruct the propagation of shock waves into the material. The outcome of the study enhances the knowledge regarding the hydrodynamic erosion of high-density materials (ρ > 15 kg/mm3) in response to the water flow rate, frequency, and time exposure. Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2022 Electronic address https://www.sciencedirect.com/science/article/pii/S0043164821002829?via%3Dihub
Number of the records: 1