Quantitative Evaluation of Cavitation Erosion

1998 ◽  
Vol 120 (1) ◽  
pp. 179-185 ◽  
Author(s):  
Shuji Hattori ◽  
Hiroyuki Mori ◽  
Tsunenori Okada
Keyword(s):  
Impact Energy ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Impact Load ◽  
Bubble Collapse ◽  
Impact Loads ◽  
Volume Loss ◽  
Developed Pressure ◽  
Cavitation Erosion Resistance ◽  
The Impact

In order to evaluate the quantitative cavitation-erosion resistance of materials, a pressure-detector-installed specimen was developed, which can measure both the impact load produced by cavitation bubble collapse and the volume loss simultaneously. Test specimens (pressure-detection rod) used were nine kinds of metals and were exposed to vibratory cavitation. A linear relation was obtained for all materials between the accumulated impact energy ∑Fi2 calculated from the distribution of impact loads and the volume loss, independent of test conditions. Impact energy accumulated during the incubation period and the energy for a unit material removal in steady-state period were obtained from the relation. These values are very Important concerning quantitative erosion resistance evaluation. That is, when the distribution of impact loads is acquired for different cavitation conditions, the volume loss can be estimated. This idea was applied to the venturi cavitation erosion. The experimental results for venturi test corresponds well with the prediction using these impact energy values. It was concluded that the quantitative impact energy values of materials can be determined independent of the apparatus and the test condition by using the newly developed pressure-detector-installed specimen.

The Evaluation of the Cavitational Damage in MgAl2Si Alloy Using Various Laboratory Stands

2016 ◽  
Vol 252 ◽  
pp. 61-70
Author(s):  
Robert Jasionowski ◽  
Dariusz Zasada ◽  
Wojciech Polkowski
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Flow Conditions ◽  
Final Phase ◽  
Testing Conditions ◽  
Jet Impact ◽  
Cavitation Tunnel ◽  
Actual Flow ◽  
Cavitation Erosion Resistance ◽  
The Impact

Evaluation of cavitation erosion resistance of is carried out by using various testing stands, that differ by the way of cavitation excitation and its intensity. These various testing conditions have led to a standardization of some part of laboratory stands, that in turn allows a direct comparison of results obtained in different laboratories. The aim of this study was to determine the course of cavitational destruction of MgAl2Si alloy samples tested on three different laboratory stands. The research was conducted on a vibration stand according to ASTM G32, where cavitation is forced by the vibrating element; in the cavitation tunnel reflecting actual flow conditions, and on a jet impact stand- simulating the impact microjet in the final phase of the cavitational bubbles implosion. Each laboratory stand has given a different course of cavitational destruction.

Effect of Globular Microstructure on Cavitation Erosion Resistance of Aluminium Alloys

2016 ◽  
Vol 256 ◽  
pp. 51-57 ◽  
Author(s):  
Annalisa Pola ◽  
Lorenzo Montesano ◽  
Ciro Sinagra ◽  
Marcello Gelfi ◽  
Marina La Vecchia
Keyword(s):  
Aluminum Alloys ◽  
Aluminium Alloys ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Volume Loss ◽  
Globular Microstructure ◽  
G 32 ◽  
Cavitation Erosion Resistance ◽  
Wrought Aluminum Alloys ◽  
Wrought Aluminum

In this paper the effect of globular microstructure on the cavitation erosion resistance was assessed and compared to that of conventional dendritic one. Three different wrought aluminum alloys in as-cast conditions were investigated. The samples were completely characterized by metallographic analyses and microhardness measurements. Cavitation erosion tests were performed according to ASTM G 32 standard. The volume loss was evaluated during the test by periodical interruptions. It was identified the damaging mechanism in case of both dendritic and semisolid microstructure. It was also found that the globular microstructure increases the cavitation erosion resistance only for one of the studied alloys.

Analysis on Fatigue Fracture of the Flame-Quenched 8.8Al-Bronze by Ultrasonic Vibratory Cavitation Erosion

2006 ◽  
Vol 118 ◽  
pp. 463-468
Author(s):  
Sung Mo Hong ◽  
Min Ku Lee ◽  
G.H. Kim ◽  
Chang Kyu Rhee ◽  
K.H. Kim ◽  
...  
Keyword(s):  
Steady State ◽  
Incubation Period ◽  
Load Distribution ◽  
Cavitation Erosion ◽  
Impact Load ◽  
Fatigue Properties ◽  
Impact Loads ◽  
Cavitation Damage ◽  
Number Of Cycles ◽  
The Impact

In this study the fatigue properties due to cavitation damage of flame-quenched 8.8Al-bronze (8.8Al-4.5Ni-4.5Fe-Cu) as well as current nuclear pump materials (8.8Al-bronze, SUS316 and SR50A) have been investigated by using an ultrasonic vibratory cavitation test. For this the impact loads of cavitation bubbles generated by ultrasonic vibratory device quantitatively evaluated and simultaneously the cavitation erosion experiments have been carried out. The fatigue analysis on the cavitation damage of the materials has been made from the determined impact load distribution (e.g. impact load, bubble count) and erosion parameters (e.g. incubation period, MDPR). According to Miner’s law, the exponents b of the F-N relation (Fb N = Constant) at the incubation stage (N: the number of fracture cycle) were 5.62, 4.16, 6.25 and 8.1 for the 8.8Al-bronze, flame-quenched sample, SUS316 and SR50A alloys, respectively. At steady-state, the exponents b of the F-N curve (N: the number of cycles required for a 1μm increment of MDP) were determined as 6.32, 5, 7.14 and 7.76 for the 8.8Al-bronze, flame-quenched sample, SUS316 and SR50A alloys, respectively.

Cavitation erosion resistance of ZrC nanoceramic coating

2019 ◽  
Vol 234 (6) ◽  
pp. 833-841 ◽  
Author(s):  
Hongqin Ding ◽  
Shuyun Jiang ◽  
Jiang Xu
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Volume Loss ◽  
Electrochemical Test ◽  
316 Stainless Steel ◽  
Cavitation Erosion Resistance ◽  
Scanning Electron

A ZrC nanoceramic coating was prepared on the bare 316 stainless steel for improving the cavitation erosion resistance by the double glow discharge sputter technique. The phase constitution and surface microstructure of the ZrC nanoceramic coating were characterized by X-ray diffraction, scanning electron microscope, and transmission electron microscopy. A 10-µm-thick ZrC nanoceramic coating exhibited equiaxed grains with an average grain size of 9 nm. The adhesion strength and mechanical properties for the ZrC nanoceramic coating were evaluated by scratch test and nanoindentation. The hardness value of the ZrC nanoceramic coating was about four times that of the uncoated 316 stainless steel. The cavitation erosion behavior of the ZrC nanoceramic coating in tap water was characterized by the combination of an ultrasonic vibration system with an electrochemical workstation. The volume loss, erosion depth, scanning electron microscope morphology, and electrochemical test were adopted to assess the surface damage of the ZrC nanoceramic coating. The results show that the volume loss of the ZrC nanoceramic coating is 0.53 mm3, which is only 46% of the 316 stainless steel (1.14 mm3) after cavitation test, and erosion damage of the ZrC nanoceramic coating is significantly decreased as compared to the uncoated 316 stainless steel. The electrochemical test results also indicate that the ZrC nanoceramic coating shows higher corrosion resistance than the 316 stainless steel under cavitation erosion condition. Thus, the ZrC nanoceramic coating can be adopted to enhance the cavitation erosion resistance of the 316 stainless steel.

Cavitation erosion resistance of a Co28Cr22Fe alloy.

2017 ◽  
Author(s):  
Juliana Barbarioli ◽  
André Tschiptschin ◽  
Cherlio Scandian ◽  
Manuelle Curbani Romero
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Cavitation Erosion Resistance

Effects of Co addition on microstructure and cavitation erosion resistance of plasma sprayed TiNi based coating

2021 ◽  
Vol 409 ◽  
pp. 126838
Author(s):  
Xinlong Wei ◽  
Wuyan Zhu ◽  
Aolin Ban ◽  
Dejia Zhu ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Cavitation Erosion ◽  
Erosion Resistance ◽  
Co Addition ◽  
Cavitation Erosion Resistance ◽  
Plasma Sprayed
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