Effect of Initial Surface Roughness on Cavitation Erosion Resistance of Arc-Sprayed Fe-Based Amorphous/Nanocrystalline Coatings

Lin, Junjie; Wang, Zehua; Cheng, Jiangbo; Kang, Min; Fu, Xiuqing; Hong, Sheng

doi:10.3390/coatings7110200

Cited by 33 publications

(19 citation statements)

References 29 publications

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“…Nevertheless, the cavitation erosion on rough walls is very important from the point of view of industrial applications because most of the industrial wall materials suffer from the influence of wall roughness. Subsequently, it is a known fact that the cavitation erosion is highly enhanced by wall roughness, which is observed experimentally by an ultrasonic vibrometer test [28][29][30][31]. The experimental results show that the roughness height smaller than 25 µm does not affect the cavitation erosion behavior, whereas the erosion is enhanced with an increase in the initial surface roughness [28].…”

Section: Introductionmentioning

confidence: 78%

Erosion Mechanism of a Cavitating Jet on Groove Roughness

Fujisawa

Yamagata

Seki

et al. 2020

Fluids

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The erosion behavior of a cavitating jet on groove roughness was investigated experimentally using mass-loss characteristics, scanning electron microscopy (SEM) observation, time-resolved shadowgraph, and schlieren flow visualizations. The wall morphology of the cavitating-jet erosion on the groove roughness indicated an increased mass loss, which was highly increased along the groove rather than across the groove. Furthermore, increased erosion pits were observed on the groove bottom along the grooves. The shadowgraph imaging of the cavitating jet on the rough wall showed noncircular cavitation bubble distributions along and across the grooves, which corresponds to the increased number of cavitation bubbles along the grooves and the decreased number of bubbles across the grooves. This result is consistent with the erosion morphology of the groove roughness. Schlieren imaging indicated that the frequency and intensity fluctuation of the shockwave formation did not change significantly on the groove roughness along and across the grooves. The findings in the study show that the increased erosion mechanism on groove roughness is caused by the increased number of impulsive forces and the shockwave focusing effect on the groove bottom.

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Section: Introductionmentioning

confidence: 78%

Erosion Mechanism of a Cavitating Jet on Groove Roughness

Fujisawa

Yamagata

Seki

et al. 2020

Fluids

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“…Also it has been reported in the literature that usually, ferritic stainless steel has lower CER than austenitic and martensitic stainless steel [45]. The cavitation resistance of materials beyond microstructure is also influenced by e.g., roughness [46], composition and phase transformation [47].…”

Section: Structurementioning

confidence: 99%

“…High density and low porosity coating, with high adhesion to the substrate is also possible by arc spaying [46]. However, in the case of the applied coating, it was noticed that it was necessary to grind the surface, which affected the increasing CER.…”

Section: Coatingsmentioning

confidence: 99%

Cavitation Erosion Resistance Influence of Material Properties

Zakrzewska

Krella

2019

Advances in Materials Science

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The cavitation erosion is the phenomena that causes degradation of fluid flow machinery components due to repetitive implosion of cavitation bubbles adjacent to the solid surface. Cavitation erosion is a complex phenomenon, which includes not only hydrodynamic factors of liquid, but also properties of erodible material e.g. microstructure, hardness or Young modulus. In order to reduce the negative impact of erosion on machine components, there are many methods to increase cavitation erosion resistance. The paper discusses the correlations between structural and mechanical properties and the resistance to cavitation erosion (CER) of pure materials, their alloys and coatings. Methods to increase CER have also been described - using heat / thermo-chemical treatment and application of coatings by various methods.

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“…To improve the CE resistance of material, high-velocity air fuel [7], high-velocity oxygen fuel (HVOF) [8], arc spraying [9], atmospheric plasma spraying [10], and other surface modification technologies had been developed. Due to the optimal combination of mechanical strength (hardness and fracture toughness), HVOF-sprayed WC-Co-based ceramic-metal (cermet) composites coatings can improve CE resistance [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Cobalt Content on the Microstructure, Mechanical Properties and Cavitation Erosion Resistance of HVOF Sprayed Coatings

Bai

Chen

et al. 2019

Coatings

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Cobalt-based alloy coatings and WC-Co-based ceramic–metal (cermet) coatings have been widely used because of their desirable mechanical properties and corrosion resistance. In this work, the influence of Co content on the microstructure, mechanical properties and cavitation erosion (CE) resistance were investigated. A cobalt-based alloy coating, a WC-12Co coating, and a WC-17Co cermet coating were deposited by high-velocity oxygen fuel (HVOF) spraying on 1Cr18Ni9Ti substrates. Results indicate that the cobalt-based alloy coating had the largest surface roughness because surface-bonded particles of lower plastic deformation were flattened. The existence of WC particles had led to an increase in hardness and improved the fracture toughness due to inhibit crack propagation. The pore appeared at the interface between WC particles, and the matrix phase had introduced an increase in porosity. With the increase in Co content, the cohesion between matrix friction and WC particles increased and then decreased the porosity (from 0.99% to 0.84%) and surface roughness (Ra from 4.49 to 2.47 μm). It can be concluded that the hardness had decreased (from 1181 to 1120 HV0.3) with a decrease in WC hard phase content. On the contrary, the fracture toughness increased (from 4.57 to 4.64 MPa∙m1/2) due to higher energy absorption in the matrix phase. The WC-12Co and WC-17Co coatings with higher hardness and fracture toughness exhibited better CE resistance than the cobalt-based alloy coating, increasing more than 20% and 16%, respectively. Especially, the WC-12Co coating possessed the best CE resistance and is expected to be applicable in the hydraulic machineries.

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Effect of Initial Surface Roughness on Cavitation Erosion Resistance of Arc-Sprayed Fe-Based Amorphous/Nanocrystalline Coatings

Cited by 33 publications

References 29 publications

Erosion Mechanism of a Cavitating Jet on Groove Roughness

Erosion Mechanism of a Cavitating Jet on Groove Roughness

Cavitation Erosion Resistance Influence of Material Properties

Effects of Cobalt Content on the Microstructure, Mechanical Properties and Cavitation Erosion Resistance of HVOF Sprayed Coatings

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