Cavitation erosion of WC-Co

 

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dc.contributor.advisor Ball, Anthony en_ZA
dc.contributor.author Hankey, S E en_ZA
dc.date.accessioned 2016-08-05T10:49:21Z
dc.date.available 2016-08-05T10:49:21Z
dc.date.issued 1987 en_ZA
dc.identifier.citation Hankey, S. 1987. Cavitation erosion of WC-Co. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/21135
dc.description Bibliography: pages 68-70. en_ZA
dc.description.abstract An investigation involving the vibratory cavitation erosion of WC-Co alloys was undertaken in order to determine the mechanisms of material removal. Nineteen grades of WC-Co alloys were studied. These alloys had been previously characterised according to microstructural and mechanical properties. Further characterisation by way of Young's modulus and density of the materials was undertaken. An investigation of the i nfluence of various parameters on cavitation erosion established a binder content dependence on erosion. For two grain sizes, erosion was found to increase to a maximum at 12 vo1-% binder content (1.8 μm grain size) and 23 vol-% binder (2.8 μm grain size). The main mode of material removal was found to be cobalt removal followed by WC grain pull-out. In high binder content alloys, cobalt removal was predominant with little loss of WC grains. X-ray diffraction showed that the allotropic phase transformation of the binder under cavitational attack was beneficial to the erosion resistance of these alloys. The erosion of low binder content alloys was controlled by the contiguity of the WC skeleton. Maximum erosion occurred at binder contents which corresponded to the combination of a fragile WC skeleton and a small volume of available cobalt for strain induced transformation. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Cavitation en_ZA
dc.subject.other Tungsten-cobalt alloys - Metallurgy en_ZA
dc.subject.other Materials Science en_ZA
dc.title Cavitation erosion of WC-Co en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Centre for Materials Engineering en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Hankey, S. E. (1987). <i>Cavitation erosion of WC-Co</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering. Retrieved from http://hdl.handle.net/11427/21135 en_ZA
dc.identifier.chicagocitation Hankey, S E. <i>"Cavitation erosion of WC-Co."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1987. http://hdl.handle.net/11427/21135 en_ZA
dc.identifier.vancouvercitation Hankey SE. Cavitation erosion of WC-Co. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1987 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21135 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hankey, S E AB - An investigation involving the vibratory cavitation erosion of WC-Co alloys was undertaken in order to determine the mechanisms of material removal. Nineteen grades of WC-Co alloys were studied. These alloys had been previously characterised according to microstructural and mechanical properties. Further characterisation by way of Young's modulus and density of the materials was undertaken. An investigation of the i nfluence of various parameters on cavitation erosion established a binder content dependence on erosion. For two grain sizes, erosion was found to increase to a maximum at 12 vo1-% binder content (1.8 μm grain size) and 23 vol-% binder (2.8 μm grain size). The main mode of material removal was found to be cobalt removal followed by WC grain pull-out. In high binder content alloys, cobalt removal was predominant with little loss of WC grains. X-ray diffraction showed that the allotropic phase transformation of the binder under cavitational attack was beneficial to the erosion resistance of these alloys. The erosion of low binder content alloys was controlled by the contiguity of the WC skeleton. Maximum erosion occurred at binder contents which corresponded to the combination of a fragile WC skeleton and a small volume of available cobalt for strain induced transformation. DA - 1987 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1987 T1 - Cavitation erosion of WC-Co TI - Cavitation erosion of WC-Co UR - http://hdl.handle.net/11427/21135 ER - en_ZA


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