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Microstructure and mechanical properties of thermomechanically processed TRIP steel

Timokhina, I. B., Hodgson, P. D., Beladi, H. and Pereloma, E. V. 2009, Microstructure and mechanical properties of thermomechanically processed TRIP steel, La Metallurgia Italiana, vol. 11-12, pp. 43-48.

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Title Microstructure and mechanical properties of thermomechanically processed TRIP steel
Author(s) Timokhina, I. B.
Hodgson, P. D.
Beladi, H.
Pereloma, E. V.
Journal name La Metallurgia Italiana
Volume number 11-12
Start page 43
End page 48
Total pages 6
Publisher Associazione Italiana Di Metallurgia
Place of publication Milan, Italy
Publication date 2009-12
ISSN 0026-0843
Keyword(s) transformation induced plasticity steel
atom probe tomography
transmission electron microscopy
TRIP/TWIP effects
retained austenite
thermomechanical processing
Summary The strengthening mechanism responsible for the unique combination of ultimate tensile strength and elongation in a multiphase Fe-0.2C-1.5Mn-1.2Si-0.3Mo-0.6Al-0.02Nb (wt%) steel was studied. The microstructures with different volume fractions of polygonal ferrite, bainite and retained austenite were simulated by controlled thermomechanical processing. The interrupted tensile test was used to study the bainitic ferrite, retained austenite and polygonal ferrite behaviour as a function of plastic strain. X-ray analysis was used to characterise the volume fraction and carbon content of retained austenite. Transmission electron microscopy was utilised to analyse the effect of bainitic ferrite morphology on the strain induced transformation of retained austenite and retained austenite twinning as a function of strain in the bulk material. The study has shown that the austenite twinning mechanism is more preferable than the transformation induced plasticity (TRIP) mechanism during the early stages of deformation for a microstructure containing 15% polygonal ferrite, while the transformation induced plasticity effect is the main mechanism when there is 50% of polygonal ferrite in the microstructure. The bainitic ferrite morphology affects the deformation mode of retained austenite during straining. The polygonal ferrite behaviour during straining depends on dislocation substructure formed due to the deformation and the additional mobile dislocations caused by the TRIP effect. Operation of TRIP or twinning mechanisms depends not only on the chemical and mechanical stability of retained austenite, but also on the interaction of the phases during straining.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861206 Structural Metal Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2009
Copyright notice ©2009, Associazione Italiana Di Metallurgia
Persistent URL http://hdl.handle.net/10536/DRO/DU:30025569

Document type: Journal Article
Collections: Centre for Material and Fibre Innovation
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.