Austempering of Spheroidal Cast Iron.
The effect of austempering on the hardness, ultimate tensile strength and per cent elongation of twenty pre-annealed unalloyed spheriodal cast iron specimens have been investigated and evaluated. The specimens were solution treated at 800°C and 900°C, each for 10 and 90 minutes, and isothermally tra...
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| Format: | Praca dyplomowa |
| Język: | angielski |
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Obafemi Awolowo University
2014
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| Dostęp online: | http://localhost:8080/xmlui/handle/123456789/2095 |
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| _version_ | 1810764574716067840 |
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| author | Onuoha, Enyinnaya Martin |
| author2 | Afonja, Adeniyi. A. |
| author_facet | Afonja, Adeniyi. A. Onuoha, Enyinnaya Martin |
| author_sort | Onuoha, Enyinnaya Martin |
| collection | DSpace |
| description | The effect of austempering on the hardness, ultimate tensile strength and per cent elongation of twenty pre-annealed unalloyed spheriodal cast iron specimens have been investigated and evaluated. The specimens were solution treated at 800°C and 900°C, each for 10 and 90 minutes, and isothermally transformed at 300°C and 400°C for 3 hours.
The test results indicated hardness and ultimate tensile strength improvements through variations in the three factors. Solution treatment at 900°C for 56.35 minutes followed by isothermal transformation at 352°C for 3 hours yielded a Brinell Hardness Number (BHN) of 315, which was much higher than an average Brinell Hardness Number of 157 obtained in the untreated specimens. Solution treatment temperature appeared to be the most potent of the three factors considered for hardness and strength improvements in the unalloyed spheriodal cast iron.
Isothermal transformation temperature exhibited the least positive effect on the mechanical properties tested within the range of temperatures investigated. The per cent elongations obtained at the improved strengths of the unalloyed spheroidal cast iron specimens are indicative of the overall effects of austempering on the mechanical properties. |
| format | Thesis |
| id | oai:ir.oauife.edu.ng:123456789-2095 |
| institution | My University |
| language | English |
| publishDate | 2014 |
| publisher | Obafemi Awolowo University |
| record_format | dspace |
| spelling | oai:ir.oauife.edu.ng:123456789-20952023-05-13T11:11:56Z Austempering of Spheroidal Cast Iron. Onuoha, Enyinnaya Martin Afonja, Adeniyi. A. Spheroidal cast iron austempering isothermal transformation The effect of austempering on the hardness, ultimate tensile strength and per cent elongation of twenty pre-annealed unalloyed spheriodal cast iron specimens have been investigated and evaluated. The specimens were solution treated at 800°C and 900°C, each for 10 and 90 minutes, and isothermally transformed at 300°C and 400°C for 3 hours. The test results indicated hardness and ultimate tensile strength improvements through variations in the three factors. Solution treatment at 900°C for 56.35 minutes followed by isothermal transformation at 352°C for 3 hours yielded a Brinell Hardness Number (BHN) of 315, which was much higher than an average Brinell Hardness Number of 157 obtained in the untreated specimens. Solution treatment temperature appeared to be the most potent of the three factors considered for hardness and strength improvements in the unalloyed spheriodal cast iron. Isothermal transformation temperature exhibited the least positive effect on the mechanical properties tested within the range of temperatures investigated. The per cent elongations obtained at the improved strengths of the unalloyed spheroidal cast iron specimens are indicative of the overall effects of austempering on the mechanical properties. 2014-02-12T11:49:36Z 2018-10-27T12:24:09Z 2014-02-12T11:49:36Z 2018-10-27T12:24:09Z 1986 Thesis APA http://localhost:8080/xmlui/handle/123456789/2095 en PDF application/pdf Obafemi Awolowo University |
| spellingShingle | Spheroidal cast iron austempering isothermal transformation Onuoha, Enyinnaya Martin Austempering of Spheroidal Cast Iron. |
| title | Austempering of Spheroidal Cast Iron. |
| title_full | Austempering of Spheroidal Cast Iron. |
| title_fullStr | Austempering of Spheroidal Cast Iron. |
| title_full_unstemmed | Austempering of Spheroidal Cast Iron. |
| title_short | Austempering of Spheroidal Cast Iron. |
| title_sort | austempering of spheroidal cast iron |
| topic | Spheroidal cast iron austempering isothermal transformation |
| url | http://localhost:8080/xmlui/handle/123456789/2095 |
| work_keys_str_mv | AT onuohaenyinnayamartin austemperingofspheroidalcastiron |