Cavitation Erosion

Okada, Tsunenori; IWAI, Yoshiro

doi:10.1299/jsmea1988.33.2_128

Cited by 9 publications

(7 citation statements)

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“…The lattice parameter a Ψ can be calculated for each diffraction peak where Ψ is the angle between the diffraction vector of planes (hkl) and the normal to the surface, such that Ψ= θ-γ where θ is the Bragg angle and γ is the angle of incidence of the X-ray beam relative to the specimen surface. 8…”

Section: Coating Characterisationmentioning

confidence: 99%

“…FIB cross-sectional studies confirmed the microstructure to be made-up of dome shaped columnar grains, which are typical for sputtered coatings (see Figure 9) but without the nanoscale multilayer stacking as observed in the C1 and C2 coatings. In turn, the crystalline texture plays a significant role in CE behaviour, grains with (111) orientations resist CE better [8,25,26]. The effect of the texture of HIPIMS coating on the CE performance will be further discussed in section 3.5.…”

Section: Cavitation Erosion Testmentioning

confidence: 99%

“…Previous research indicates a correlation in damage mechanism of WDE and cavitation erosion (CE) [6,7]. During the CE process, microjets are formed by asymmetric implosion of cavitation bubbles on solid surface, generating high impact pressure and stress waves [8]. It is reported that material performance ranking display similarity under the WDE and CE tests, hence, CE has frequently been considered by investigators to predict WDE behaviour.…”

Section: Introductionmentioning

confidence: 99%

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Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Harvey

Wellman

et al. 2019

Journal of Alloys and Compounds

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Water droplet erosion (WDE) protection of Ti6Al4V turbofan blades is of paramount importance to the aviation industry. A novel CrAlYN/CrN nanoscale multilayer coating deposited by the HIPIMS technique was evaluated as a potential candidate for this application. Literature suggests a strong correlation in performance ranking under WDE and cavitation erosion (CE) tests. Hence, the WDE performance of the CrAlYN/CrN coating on Ti6Al4V was investigated with an ultrasonic cavitation device. The results show excellent adhesion and superior erosion resistance of the CrAlYN/CrN coating (erosion rate lower by a factor of 14 compared to the bare Ti6Al4V substrate) and compared to coatings reported in the literature with spallation as their main erosion mechanism. Cross-sectional FIB studies revealed formation of substrate cracks underneath 2 the coating when CE generated stresses exceeded the fatigue strength of the Ti6Al4V alloy.The interfaces of the nanoscale multilayers protected the substrate by forming an effective barrier against shock waves, delayed fatigue crack formation, deflected and arrested any cracks formed impeding the overall coating damage. The research shows that the CE resistance is influenced by the coating's texture and elastic properties, (Young's modulus).The paper discusses the erosion mechanisms of the coating and the excellent CE protection it offers.

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Section: Coating Characterisationmentioning

confidence: 99%

Section: Cavitation Erosion Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Harvey

Wellman

et al. 2019

Journal of Alloys and Compounds

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“…Thus, the increased coolant velocity only has a mechanical impact on the surface through the increased shear force. Compared with the zero velocity condition, the surface material was easily eroded due to the physical process caused by the flow shear stress under higher coolant velocity conditions [34][35][36][37][38].…”

Section: Specimen Massmentioning

confidence: 99%

Effects of cylinder head temperature and coolant velocity on the erosion behavior of water jacket in a diesel engine

Kim

Hwang

Han

et al. 2015

Wear

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“…The cracks usually develop in the parallel direction, perpendicular to the surface, when a certain depth is obtained. It means that incubation has been achieved and the loss of mass of the material starts [5]. In the literature, we found studies about the relation between the resistance of cavitation erosion of materials and their fatigue resistance [6] and about the resistance of cavitation erosion under the influence of creep-fatigue [7,8]; nevertheless, any information upon the cumulative effect of these two damages was not addressed.…”

Section: Introductionmentioning

confidence: 99%

Correlation between mass loss on the cavitation erosion and the fatigue stress level for a martensitic stainless steel

Vodă¹,

Pertúz-Comas²,

Şerban³

2019

revuin

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Vol. 18, n.° 1, pp. 11-20, 2019 Revista UIS Ingenierías AbstractThe effect of fatigue on the cavitation erosion was examined for a martensitic stainless steel used in the manufacture of the blades for the bulb turbines of the "Iron Gates II" Power Plant turbines. For the cavitation tests, two kinds of specimens were manufactured: from the original material (which was not subjected to fatigue) and samples of materials that were subjected to fatigue cycles with different amplitudes (from 170 to 255 MPa). It was observed that fatigue increases the tendency of cavitation erosion and thus, seems like a cumulative damage. The analysis of the cavitation erosion was done considering simultaneously the mass loss of the time dependence, the surface roughness and the modifications to the microstructure of the specimens. For the material previously subjected to fatigue cycles, the final mass loss (after 150 minutes of cavitation exposure) increases approximately by 30% and the depth of penetration by 25%. In the microstructural analyses, numerous cracks at grain boundaries were observed. Finally, a mathematical model for the dependence of mass losses with the applied stress was developed.Keywords: cavitation erosion; cumulative damage; fatigue; stainless steel; water turbine. ResumenSe examinó el efecto de la fatiga en la erosión por cavitación para un acero inoxidable martensítico utilizado en la fabricación de palas para las turbinas Bulbo de las turbinas de la Planta de Energía "Iron Gates II." Para las pruebas de cavitación se fabricaron dos tipos de especímenes: tanto el material original (que no estaba sometido a fatiga) como muestras de material que se sometieron a ciclos de fatiga con diferentes amplitudes (de 170 a 255 MPa). Se observó que la fatiga aumenta la tendencia de la erosión por cavitación y por lo tanto, parece un daño acumulativo. El análisis de la erosión por cavitación se realizó teniendo en cuenta simultáneamente la pérdida de masa de la dependencia del tiempo, la rugosidad de la superficie y las modificaciones en la microestructura de las muestras. Para el material sometido previamente a ciclos de fatiga, la pérdida de masa final (después de 150 minutos de exposición a la cavitación) aumenta aproximadamente un 30 % y la profundidad de penetración con un 25 %. En los análisis microestructurales se observaron numerosas grietas en los límites de los granos. Finalmente, se desarrolló un modelo matemático para la dependencia de las pérdidas de masa con el estrés aplicado.Palabras clave: acero inoxidable; daño acumulativo; erosión por cavitación; fatiga; turbina de agua. 12M. Vodă, A. Pertuz-Comas, V. A Şerban

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Cavitation Erosion

Cited by 9 publications

References 0 publications

Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Cavitation erosion performance of CrAlYN/CrN nanoscale multilayer coatings deposited on Ti6Al4V by HIPIMS

Effects of cylinder head temperature and coolant velocity on the erosion behavior of water jacket in a diesel engine

Correlation between mass loss on the cavitation erosion and the fatigue stress level for a martensitic stainless steel

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