Characterization of erosion of metallic materials under cavitation attack in a mineral oil

  • 11 Pages
  • 0.92 MB
  • English
National Aeronautics and Space Administration, For sale by the National Technical Information Service] , Washington, D.C, [Springfield, Va
Cavitation., Metals -- Erosion., Mineral
StatementBezzam C.S. Rao and Donald H. Buckley.
SeriesNASA technical paper -- 2368.
ContributionsBuckley, Donald H., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.
The Physical Object
Pagination11 p. :
ID Numbers
Open LibraryOL17665707M

Characterization of Erosion of Metallic Materials Under Cavitation Attack in a Mineral Oil Bezzam C. Rao and Donald H. Buckley Lewis Research Center Cleveland, Ohio NIA National Aeronautics and Space Administration Scientific and Technical Information BranchCited by: 2.

Characterization of erosion of metallic materials under cavitation attack in a mineral oil. Washington, D.C.: National Aeronautics and Space Administration ; [Springfield, Va.: For sale by the National Technical Information Service], Get this from a library. Characterization of erosion of metallic materials under cavitation attack in a mineral oil.


RAO and D. BUCKLEY Lewis Research Center, National Aeronautics and Space Administration, Cleveland, OH (U.S.A.) (Received November 7,; accepted J ) Summary Studies of the erosion of aluminum Cited by: 7.

Materials Science and Engineering, 67 () 55 Deformation and Erosion of F.C.C. Metals and Alloys under Cavitation Attack B.

RAO and D. BUCKLEY Lewis Research Center, National Aeronautics and Space Administration, Cleveland, OH (U.S.A.) (Received October 7, ; in revised form Febru ) SUMMARY Experimental investigations Cited by:   Cavitation erosion usually involves an attack on the surface by gas or vapor bubbles, creating a sudden collapse due to a change in pressure near the surface.

Low pressure (below the saturated vapor pressure) is generated hydrodynamically, due to various flow parameters, such as liquid viscosity, temperature, pressure and nature of flow. After a brief historical survey of cavitation and its deleterious effects, erosion and material response are considered from the point of view of stress field generation caused by cavitation collapse and the ensuing physical and chemical processes which contribute to Cited by: corrosion was enhanced by cavitation erosion.

Under only cavitation, large cavities were found with a–j grain-boundary corrosion around the pit edge, whereas, in the presence of cathodic protection, the number of cavities was found to increase but the grain-boundary attack was seen to be absent.

They also found microcracks of 5 l to 10 lmCited by: metallic materials, AlCu, brass, phosphor bronze, Ni, Fe, Mo, and Ti-5ASn exposed to cavitation attack in a viscous mineral oil with a 20 kHz ultrasonic oscillator vibrating at 50 Um amplitude are reported.

Cavitation is a phenomenon in which rapid changes of pressure in a liquid lead to the formation of small vapor-filled cavities in places where the pressure is relatively low.

When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock wave that is strong very close to the bubble, but rapidly weakens as it propagates away from the bubble. Cavitation erosion-corrosion of nickel aluminium bronze with oxide films formed under two different conditions, oxide formed in air for 1 week and oxide formed after 3.

A study of cavitation erosion on engineering materials. and advanced metallic materials [1]. Cavitation produces tiny bubbles in the liquid, which then periodically oscillate and implode. Abstract: Cavitation erosion tests on metallic materials were conducted by using a water tunnel facil-ity and vibratory units.

On the basis of the results, a method to predict the material damage caused by Cavitation attack was established as follows: The depth of the pit was chosen as the index of the dam-age.

This increased linearly against. Corcerning the damage of stainless steels by cavitation erosion Table 1 Chemical composition of the experimental stainless steels Alloy Element,wt.% Si Mn Mo Cr Ni Al Ti P S Cu Fe ECr ENi A - - ball Evaluation of Cavitation Erosion Behavior of Commercial Steel Grades Used in the Design of Fluid Machinery I.

TZANAKIS, L. BOLZONI, D.G. ESKIN, and M. HADFIELD The erosion response under cavitation of different steel grades was assessed by studying the erosion rate, the volume removal, the roughness evolution, and the accumulated strain energy. Table 1 presents some results of cavitation erosion test [2].

On the base of these results new factor R of cavitation erosion resistance of materials was defined as: R tt v = inc v + max max (2) Values defining of cavitation erosion materials (R rate) are presented in Fig.

How. Proceedings of the 7 th International Symposium on Cavitation CAV – Paper No. 41 August, Ann Arbor, Michigan, USA 1 Cavitation Erosion – A review of physical mechanisms and erosion risk models Tom J.C. Van Terwisga MARIN, Delft University of Technology Wageningen, The Netherlands Patrick A.

Fitzsimmons Lloyd’s Register. Synergy tests were performed for two most common propeller materials, duplex stainless steel (DSS) and nickel aluminium bronze (NAB), by means of an indirect ultrasonic vibratory system.

Tests were conducted for pure cavitation erosion in distilled water, pure corrosion using in situ electrochemistry under % NaCl solution and a combination of. the rate of cavitation erosion; • morphology and characterization of the surface microstructures of PH steels subjected to cavitation erosion.

In the thesis, the researches were conducted on the stainless steel with indirect martensitic transformation, from the. SPECIAL ISSUE ON CAVITATION Abstracts are invited for papers a Special Issue of the ASTM International journal Materials Performance and Characterization which is being organized on the general topic of ASTM International journal Materials Performance and Characterization is Co-Edited by Professor Richard W.

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Neu, Georgia Institute of. Cavitation Erosion Cavitation occurs when a fluid's operational pressure drops below it's vapor pressure causing gas pockets and bubbles to form and collapse. This can occur in what can be a rather explosive and dramatic fashion.

Mechanical erosion of a solid material caused by cavitation is called cavitation erosion. Damage due to cavitation erosion can be found in high-speed impellers, valves, pump casings and water turbines []. Cavita-tion can damage and erode solid materials by the fol-lowing mechanisms: generation of shock waves due to.

Bilbiography: p. This investigation was undertaken to find the optimum hydraulic fluids and materials for combating cavitation erosion in hydraulic mining machinery operating,on oil-in-water emulsions, Controlled cavitation was generated in the laboratory in a vibratory cavitation apparatus employing the stationery specimen system.

Figure 4 points out that the alloy A7, with 6% Ni and 12% Cr, has the highest cavitation erosion rate, while the lowest cavitation erosion resistance was recorded for the alloy A8, with 10% Ni and 12% Cr.

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The cavitation erosion resistance increases with. Under dynamic conditions including cavitation erosion and erosion-corrosion, the E corr in the three solutions all shifted in positive direction from that under static condition, but the extent of ΔE corr increased in the order of Yangtze, Yellow and Talimu river.

The corrosion rate under dynamic conditions greatly enhanced, especially in. At the Hiroshima University, one of the participants in the program, Cavitation erosion tests were conducted on the five selected metallic materials, and the test results obtained were sent to Gdańsk, where they are currently under analysis together with the data from the other participating laboratories worldwide.

Modeling and analysis of material behavior during cavitation erosion Samir Chandra Roy To cite this version: Samir Chandra Roy.

Modeling and analysis of material behavior during cavitation erosion. Materials. Université Grenoble Alpes, Cited by: 3. Time and Temperature Dependent Damage Characteristics of Al Alloy Figure 7 shows the surface damage with cavitation time for O aluminum alloy in sea water at the vi-brationamplitudeof10 m.

Fig SEM morphologies of O Al alloy after cavitation experiment during different time intervals at10 mvibrationamplitude.

Description Characterization of erosion of metallic materials under cavitation attack in a mineral oil PDF

under an ultrasonic vibrating sonotrode with perspex fixture for the indirect cavitation process conducted under the ASTM G standards The study conducted investigates the behavioral response of DSS and NAB to cavitation erosion-corrosion in % NaCl solution and the relation between the cavitation erosion and the corrosion.

Cavitation Tunnel Testing. A cavitation tunnel is a continuous loop that can be used either to optimize flow modeling and geometry design (at the Emerson Tunnel in the UK), or for material testing at the Applied Research Laboratory (ARL) Tunnel at Pennsylvania State University.

The latter test site has a reduced diameter test section, which allows for velocities. Erosion, Corrosion, Cavitation, Wear and Chemical Attack Problems on: Toll Free: ENECON () • International Tel: • Fax: The Fluid Flow Systems Specialists. ® TM.Evaluation of cavitation-induced pressure loads applied to material surfaces by finite-element-assisted pit analysis and numerical investigation of the elasto-plastic deformation of metallic materials F.

Pöhla,n, S. Mottyllb, R. Skodab, S. Hutha a Ruhr-Universität Bochum, Chair of Materials Technology, Bochum, Germany.Effect of Porosity on Cavitation Erosion Resistance of HVOF Processed Tungsten Fig. 1: Schematic of HVOF Process Fig. 2: WC-CoCr spray powders +15µ size The heated powder particles leave the nozzle at high velocities in excess of m/s) strikes the substrate surface forms dense coating in successive layers.

2. Materials StudiedFile Size: 1MB.