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Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels
Dissertation (MSc)--University of Pretoria, 2018.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2019
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| _version_ | 1867613688418009089 |
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| access_status_str | Open Access |
| author2 | Mostert, R.J. (Roelf) |
| author_browse | Mostert, R.J. (Roelf) |
| author_facet | Mostert, R.J. (Roelf) |
| collection | Thesis |
| dc_rights_str_mv | © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2018. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/71012 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:07.413Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/71012 Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels Mostert, R.J. (Roelf) u14335213@tuks.co.za Siyasiya, Charles Witness Mulala, Mukadi Clovis UCTD Dynamic recrystallization Retained strain Nb-Ti microalloyed steels Inter-pass time Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Dissertation (MSc)--University of Pretoria, 2018. An empirical equation was developed for the prediction of the critical strain for the onset of dynamic recrystallization (DRX) in microalloyed Nb-containing steels. Single-rolling pass isothermal compression tests were carried out in a Gleeble 1500TM thermomechanical processing simulator at 1000, 1050, 1100 and 1150 oC and strain rates of 0.5, 1 and 3s-1. The strain was 0.85. The Nb content was systematically varied between 0.024 and 0.10 mass %Nb. No further effect of addition of Nb on the critical strain was observed above 0.068%. The double-hit isothermal compression tests were carried out to investigate the influence of retained strain on the critical strain for DRX under the same conditions spelt out above but in tests in which the pre-strain was kept below the critical strain i.e. 0.142, and the amount of retained strain was varied by increasing the inter-pass time from 0.5 s to 8 s. As expected, the introduction of a pre-strain decreased the critical strain for the initiation of DRX. The data obtained from the experimental tests were used to develop an empirical model for the prediction of the critical strain for the onset of DRX taking into account the Nb content and the retained strain. A good correlation was obtained between the predicted and the experimental results. mi2025 Materials Science and Metallurgical Engineering MSc Unrestricted SDG-04: Quality education SDG-07: Affordable and clean energy SDG-12: Responsible consumption and production 2019-08-12T11:18:48Z 2019-08-12T11:18:48Z 19/04/11 2018 Dissertation Mulala, MC 2018, Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/71012> A2019 http://hdl.handle.net/2263/71012 en © 2019 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Dynamic recrystallization Retained strain Nb-Ti microalloyed steels Inter-pass time Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels |
| title | Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels |
| title_full | Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels |
| title_fullStr | Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels |
| title_full_unstemmed | Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels |
| title_short | Influence of a pre-deformation on the critical strain for the onset of dynamic recrystallization of Ti-Nb microalloyed steels |
| title_sort | influence of a pre deformation on the critical strain for the onset of dynamic recrystallization of ti nb microalloyed steels |
| topic | UCTD Dynamic recrystallization Retained strain Nb-Ti microalloyed steels Inter-pass time Engineering, built environment and information technology theses SDG-04 SDG-04: Quality education Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production |
| url | http://hdl.handle.net/2263/71012 |