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The repetitive impact wear of steels for hydro-powered mining machinery
The repetitive impacting of solid components in industry can result in wear damage which may significantly limit service life. Impact wear problems have been encountered in hydro-powered stoping equipment (eg rockdrills and impact rockbreakers) developed for deep level gold mining in South Africa. T...
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| Format: | Thesis |
| Language: | English |
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Centre for Materials Engineering
2016
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| _version_ | 1867613321221373952 |
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| access_status_str | Open Access |
| author | Fricke, Roland |
| author2 | Allen, Colin |
| author_browse | Allen, Colin Fricke, Roland |
| author_facet | Allen, Colin Fricke, Roland |
| author_sort | Fricke, Roland |
| collection | Thesis |
| description | The repetitive impacting of solid components in industry can result in wear damage which may significantly limit service life. Impact wear problems have been encountered in hydro-powered stoping equipment (eg rockdrills and impact rockbreakers) developed for deep level gold mining in South Africa. This research project was a study of the repetitive impact wear of reciprocating valve components (eg poppet valves within the impact rockbreaker) under simulated conditions. A laboratory apparatus, capable of producing impacts varying in energy from 2 - 5 J and varying in frequency from 5 - 50 Hz in an aqueous environment (distilled water), was designed and built for this purpose. Impact tests were conducted in order to: a) rank materials according to impact wear resistance, b) to determine modes and mechanisms of wear, c) to determine material, microstructural, design and operating parameters of importance in minimising wear, d) to make recommendations concerning the above, to facilitate productivity and longlife of poppet valves within impact rockbreakers. The materials selected for testing (817M40, 1210 and AISI 304, AISI 431 and AISI 440C) are steels currently used by the gold mining industry in different applications and known to perform satisfactorily in service. These materials are not all ideally suited to application in valves. They were chosen in order to illustrate how different steel compositions, microstructures and heat treatments influence the rate and mode of wear. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/18214 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:14.045Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Centre for Materials Engineering |
| publisherStr | Centre for Materials Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/18214 The repetitive impact wear of steels for hydro-powered mining machinery Fricke, Roland Allen, Colin Ball, Anthony Materials Engineering The repetitive impacting of solid components in industry can result in wear damage which may significantly limit service life. Impact wear problems have been encountered in hydro-powered stoping equipment (eg rockdrills and impact rockbreakers) developed for deep level gold mining in South Africa. This research project was a study of the repetitive impact wear of reciprocating valve components (eg poppet valves within the impact rockbreaker) under simulated conditions. A laboratory apparatus, capable of producing impacts varying in energy from 2 - 5 J and varying in frequency from 5 - 50 Hz in an aqueous environment (distilled water), was designed and built for this purpose. Impact tests were conducted in order to: a) rank materials according to impact wear resistance, b) to determine modes and mechanisms of wear, c) to determine material, microstructural, design and operating parameters of importance in minimising wear, d) to make recommendations concerning the above, to facilitate productivity and longlife of poppet valves within impact rockbreakers. The materials selected for testing (817M40, 1210 and AISI 304, AISI 431 and AISI 440C) are steels currently used by the gold mining industry in different applications and known to perform satisfactorily in service. These materials are not all ideally suited to application in valves. They were chosen in order to illustrate how different steel compositions, microstructures and heat treatments influence the rate and mode of wear. 2016-03-28T14:21:25Z 2016-03-28T14:21:25Z 1991 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/18214 eng application/pdf Centre for Materials Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Materials Engineering Fricke, Roland The repetitive impact wear of steels for hydro-powered mining machinery |
| thesis_degree_str | Master's |
| title | The repetitive impact wear of steels for hydro-powered mining machinery |
| title_full | The repetitive impact wear of steels for hydro-powered mining machinery |
| title_fullStr | The repetitive impact wear of steels for hydro-powered mining machinery |
| title_full_unstemmed | The repetitive impact wear of steels for hydro-powered mining machinery |
| title_short | The repetitive impact wear of steels for hydro-powered mining machinery |
| title_sort | repetitive impact wear of steels for hydro powered mining machinery |
| topic | Materials Engineering |
| url | http://hdl.handle.net/11427/18214 |
| work_keys_str_mv | AT frickeroland therepetitiveimpactwearofsteelsforhydropoweredminingmachinery AT frickeroland repetitiveimpactwearofsteelsforhydropoweredminingmachinery |