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The unlubricated sliding wear behaviour of austempered ductile irons
Bibliography: pages 85-89.
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Centre for Materials Engineering
2016
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| _version_ | 1867613330116444160 |
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| access_status_str | Open Access |
| author | Fordyce, E P |
| author2 | Allen, Colin |
| author_browse | Allen, Colin Fordyce, E P |
| author_facet | Allen, Colin Fordyce, E P |
| author_sort | Fordyce, E P |
| collection | Thesis |
| description | Bibliography: pages 85-89. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/21955 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:34:25.395Z |
| 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:11427/21955 The unlubricated sliding wear behaviour of austempered ductile irons Fordyce, E P Allen, Colin Iron, Nodular - Fatigue Materials Engineering Bibliography: pages 85-89. A study has been made of the unlubricated sliding wear behaviour of austempered ductile irons under conditions of sliding velocity and load. The load was varied between 0.9 and 2.8 MPa, whilst the sliding velocity range was between 0.5 and 2.0 ms⁻¹. Two commercial grades of spheroidal graphite irons, SG42 and SG60 were austempered between 250⁰C and 400⁰C. A distinction in the wear behaviour was found with metallic type wear dominating at the lower sliding velocities and an oxidative type wear being evident at the higher sliding velocities. It was however found that an increase in the load resulted in an earlier onset of the oxidative type wear regime, for a specific sliding velocity. On austempering these spheroidal graphite irons the mechanical properties as well as the sliding wear resistance increased dramatically. Furthermore, the austempered irons' outperformed a series of steels of much higher hardness by factors between 2 and 28 times under the same conditions. At the lower velocity of testing the outstanding wear resistance is attributed to the austempered iron's unique microstructure of acicular ferrite and retained austenite and a partial transformation of austenite to martensite. However, at the higher sliding velocity the exceptional wear resistance is derived from a development of an tribologically protective oxide film together with the formation of a hardened white layer. The development of the work hardened layer is linked to the high carbon in the matrix of these irons. The work hardened layer leads to a similar wear rate prevailing for all irons austempered from a specific parent iron. The synergism of variation in load, sliding velocity and wear counterface together with the effect of initial microstructure has been explain in terms of simple wear models. 2016-09-28T18:57:12Z 2016-09-28T18:57:12Z 1989 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/21955 eng application/pdf Centre for Materials Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Iron, Nodular - Fatigue Materials Engineering Fordyce, E P The unlubricated sliding wear behaviour of austempered ductile irons |
| thesis_degree_str | Master's |
| title | The unlubricated sliding wear behaviour of austempered ductile irons |
| title_full | The unlubricated sliding wear behaviour of austempered ductile irons |
| title_fullStr | The unlubricated sliding wear behaviour of austempered ductile irons |
| title_full_unstemmed | The unlubricated sliding wear behaviour of austempered ductile irons |
| title_short | The unlubricated sliding wear behaviour of austempered ductile irons |
| title_sort | unlubricated sliding wear behaviour of austempered ductile irons |
| topic | Iron, Nodular - Fatigue Materials Engineering |
| url | http://hdl.handle.net/11427/21955 |
| work_keys_str_mv | AT fordyceep theunlubricatedslidingwearbehaviourofaustemperedductileirons AT fordyceep unlubricatedslidingwearbehaviourofaustemperedductileirons |