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Effect of pre-straining and bake hardening on the microstructure and mechanical properties of CMnSi trip steels

Zhang, L. C., Timokhina, I. B., La Fontaine, A., Ringer, S. P., Hodgson, P. D. and Pereloma, E. V. 2008, Effect of pre-straining and bake hardening on the microstructure and mechanical properties of CMnSi trip steels, 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 Effect of pre-straining and bake hardening on the microstructure and mechanical properties of CMnSi trip steels
Author(s) Zhang, L. C.
Timokhina, I. B.
La Fontaine, A.
Ringer, S. P.
Hodgson, P. D.
Pereloma, E. V.
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-illduced plasticity steel
Retained austenite
Bake hardening
Mechanical behaviour
Microstmcture
Three-dimensional atom probe
Summary The effects of pre-straining and bake hardening on the mechanical behaviour and microstructural changes were studied in two CMnSi TRansformation-Induced Plasticity (TRIP) steels with different microstructures after intercritical annealing. The TRIP steels before and after pre-straining and bake hardening were characterised by X-ray diffraction, optical microscopy, transmission electron microscopy, three dimensional atom probe and tensile tests. Both steels exhibited discontinuous yielding behaviour and a significant strength increase with some reduction in ductility after pre-straining and bake hardening treatment. The following main microstructural changes are responsible for the observed mechanical behaviours: a decrease in the volume fl:action of retained austenite, a increase in the dislocation density and the formation of cell substructure in the polygonal ferrite, higher localized dislocation density in the polygonal ferrite regions adjacent to martensite or retained austenite, and the precipitation of fine iron carbides in bainite and martensite. The mechanism for the observed yield point phenomenon in both steels after treatment was analysed.
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:30019195

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.