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Effect of initial processing on the microstructure-property relationships in bake-hardened C-Mn-Si TRIP steels

Timokhina, Ilana, Pereloma, E. and Hodgson, Peter 2007, Effect of initial processing on the microstructure-property relationships in bake-hardened C-Mn-Si TRIP steels, Materials science forum, vol. 539-543, pp. 4315-4320.


Title Effect of initial processing on the microstructure-property relationships in bake-hardened C-Mn-Si TRIP steels
Author(s) Timokhina, Ilana
Pereloma, E.
Hodgson, Peter
Journal name Materials science forum
Volume number 539-543
Start page 4315
End page 4320
Publisher Trans Tech Publications
Place of publication Uetikon-Zuerich, Switzerland
Publication date 2007-03-15
ISSN 0255-5476
Keyword(s) TRIP steel
retained austenite
pre-strain
bake-hardening`
Summary The effect of pre-straining (PS) and bake-hardening (BH) on the microstructure and mechanical properties has been studied in C-Mn-Si TRansformation Induced Plasticity (TRIP) steels after: (i) thermomechanically processing (TMP) and (ii) intercritical annealing. The steels were characterised before and after PS/BH by transmission electron microscopy (TEM), X-ray diffraction (XRD), and tensile tests. The main microstructural differences were the higher volume fraction of bainite and more stable retained austenite in the TMP steel. This led to a difference in the strain-hardening behavior before and after BH treatment. The higher dislocation density in ferrite and formation of microbands in the TMP steel after PS and the formation of Fe3C carbides between the bainitic ferrite laths during BH for both steels also affected the strain-hardening behavior. However, both steels after PS/BH treatment demonstrated an increase in the yield and tensile strength.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Trans Tech Publications
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007334

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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