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A study of the strengthening mechanism in the thermomechanically processed TRIP/TWIP steel

Timokhina, I. B., Pereloma, E. V., Beladi, H. and Hodgson, P. D. 2008, A study of the strengthening mechanism in the thermomechanically processed TRIP/TWIP steel, in TMP 2008 : Proceedings of the 3rd International Conference on Thermomechanical Processing of Steels, Associazione Italiana Di Metallurgia, Padua, Italy, pp. 1-10.

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Title A study of the strengthening mechanism in the thermomechanically processed TRIP/TWIP steel
Author(s) Timokhina, I. B.
Pereloma, E. V.
Beladi, H.
Hodgson, P. D.
Conference name International Conference on Thermomechanical Processing of Steels (3rd : 2008 : Padua, Italy)
Conference location Padua, Italy
Conference dates 10-12 Sept. 2008
Title of proceedings TMP 2008 : Proceedings of the 3rd International Conference on Thermomechanical Processing of Steels
Publication date 2008
Start page 1
End page 10
Publisher Associazione Italiana Di Metallurgia
Place of publication Padua, Italy
Keyword(s) Transformation induced plasticity steel
Thermomechanical processing
Retained austenite
TRIP/TWIP effects
Transmission electron microscopy
Atom probe tomography
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 fraction of polygonal fenite, bainite and retained austenite were simulated by controlled thermomechanical processing. The interupted tensile test was used to study the bainitic ferrite, retained austenite and polygonal ferrite behavior as a function of plastic strain. X-ray analysis was used to characterize the volume fraction and carbon content of retained austenite. TEM and heat-tinting were utilized to analyze the effect of bainitic fenite 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 mechanism during the early stages of deformation for a microstructure containing I5% polygonal ferrite, while the transformation induced plasticity effect is the main mechanism in when there is 50% of polygonal ferrite in the microstructure. The baillitic fenite morphology affects the deformation mode of retained austenite during straining. The polygonal fenite behavior during straining depends on dislocation substructure tonned due to the deformation and the additional mobile dislocations caused by the TRIP effect. TRIP and TWIP effects depend not only on the chemical and mechanical stability of retained austenite, but also on the interaction of the phases during straining.
ISBN 8885298664
9788885298668
Language eng
Field of Research 091499 Resources Engineering and Extractive Metallurgy not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category E2 Full written paper - non-refereed / Abstract reviewed
Copyright notice ©2008, Associazione Italiana Di Metallurgia
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30019197

Document type: Conference Paper
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.