Abstract
The paper discusses the application of image analysis software ImagePro Plus and MetIlo for assessing cavitation erosion wear. The investigation of cavitation damage is performed on a vibratory test rig in compliance with the ASTM G32 standard using the stationary specimen method. Low-alloy steel grade 34CrNiMo6 is used as the test material. Cavitation wear is evaluated by gravimetric and roughness measurements, microscopic observations and computer image analysis in specified exposure times. The computer image analysis of selected surface areas during a predetermined exposure to cavitation time is performed using images captured with a metallographic microscope. Based on the results of scanning electron and stereoscope microscopic observations, the cavitation worn surfaces are qualitatively described. The relations between surface topography, gravimetric measurements and the microscopic results are discussed. The findings obtained by gravimetric and roughness measurements, image processing and microscopic observations are complementary. The results prove the suitability of image analysis for investigating incubation period of cavitation erosion. The quantification of cavitation erosion damage indicates that the incubation period of cavitation erosion of the tested steel lasts for 20 minutes. The results demonstrate that cavitation-worn surfaces at the initial stage of cavitation erosion can be examined using both ImagePro Plus and MetIlo.
Highlights
Cavitation consists in the formation and subsequent implosion of vapour bubbles due to local pressure fluctuations in a liquid
This study reported the preliminary results of study investigating, whether two image processing software programmes: MetIlo and ImagePro Plus, can be used for assessing cavitation erosion wear
The numerical results produced by the above software was compared with the image analysis results, mass loss calculations, topography measurements and microscopic observations
Summary
Cavitation consists in the formation and subsequent implosion of vapour bubbles due to local pressure fluctuations in a liquid. Two types of cavitation usually occur: hydrodynamic and vibratory. These phenomena have effect on the performance, service and operation time of different types of fluid machinery such as pump systems [1], propellers [2], processing equipment [3], diesel engines [4] and even rocket engines [5]. Cavitation erosion consists in surface damage and progressive loss of material from a solid due to the action of bubbles in the liquid that systematically collapse at the surface. It is generally accepted that the impact pressure and shock waves generated by the implosion of cavitation bubbles lead to wear of materials [7,8,9,10]
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