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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. 2009, Effect of pre-straining and bake hardening on the microstructure and mechanical properties of CMnSi trip steels, Metallurgia Italiana, vol. 101, no. 6, pp. 49-55.

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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.
Journal name Metallurgia Italiana
Volume number 101
Issue number 6
Start page 49
End page 55
Total pages 7
Publisher Assoc Italiana Metallurgia
Place of publication Milan, Italy
Publication date 2009-06
ISSN 0026-0843
Keyword(s) transformation-induced plasticity steel
retained austenite
bake hardening
mechanical behaviour
microstructure
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 fraction of retained austenite, an 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.
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
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30025805

Document type: Journal Article
Collections: Centre for Material and Fibre Innovation
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Created: Thu, 25 Mar 2010, 19:40:58 EST by Sandra Dunoon

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.