For TRIP steels to be included as a future structural steel in automobile industries, the drawbacks associated with high silicon (more than 1%) must be solved. To this end, TRIP steels, with aluminum as a substitute for the silicon, have been under investigation by many groups. / In this work, the approach is to investigate the effect of hot deformation on the microstructure and the mechanical properties of the aluminum containing TRIP steels. The problem with these steels is that the strength is reduced compared to classical Si TRIP steels. In this work, a number of mechanisms could contribute to the strengthening, including refining the austenite grain and work hardening of ferrite. These may also affect the retained austenite characteristics. / Two different C-Mn-Al TRIP aided steels with aluminum contents of 1.43 wt % and 2.0 wt % were investigated and compared with a typical TRIP steel containing 1.5 wt % Si. To determine the critical hot working temperatures, the FactSage software was used to predict the phase diagram and the critical temperatures were confirmed by heat treatment and metallography of the quenched specimens. Using these data, hot deformation experiments were performed to investigate the influence of the deformation temperature and the strain within the intercritical region by using a Gleeble simulator. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.82496 |
| Date | January 2004 |
| Creators | Heun-Ho, Hong, 1970- |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Engineering (Department of Mining, Metals and Materials Engineering.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 002209993, proquestno: AAIMR12611, Theses scanned by UMI/ProQuest. |
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