Many engineering materials call for increasing strength and ductility. Unfortunately, the material properties of high ductility and high strength are usually mutually contradictory. These conflicting requirements have generated interest in transformation induced plasticity or TRIP steels, which mainly consist of a mixture bainite, ferrite and retained austenite. The superior strength and ductility of these types of steels is due to the strain induced transformation of retained austenite to martensite. Intercritical deformation (i.e. deformation in the austenite + ferrite two phase region) has been extensively studied on C-Mn and microalloyed steels, but not on TRIP steels. Intercritical rolling increases the volume fraction and decreases the grain size of ferrite. These characteristics may be beneficial to the ductility of TRIP steels, since the volume fraction of retained austenite may increase with ferrite volume fraction by increasing the level of C segregation to the untransformed austenite. As well, the size of the retained austenite may decrease with decreasing ferrite grain size, thus increasing the stability of retained austenite against strain induced transformation. The aim of this study was to investigate the effect of the intercritical deformation on the characteristics of retained austenite and resulting mechanical properties of a TRIP steel.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.19663 |
| Date | January 2003 |
| Creators | Fei, Hong Tao |
| 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: 002022627, Theses scanned by McGill Library. |
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