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Effect of bake-hardening treatment on the mechanical properties of high strength bainitic steel produced by thermomechanical processing

Timokina, Ilana B., Beladi, Hossein, Xiong, Xiang Y. and Hodgson, Peter D. 2012, Effect of bake-hardening treatment on the mechanical properties of high strength bainitic steel produced by thermomechanical processing, Materials science forum, vol. 706-709, pp. 2332-2337.

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Title Effect of bake-hardening treatment on the mechanical properties of high strength bainitic steel produced by thermomechanical processing
Author(s) Timokina, Ilana B.
Beladi, Hossein
Xiong, Xiang Y.
Hodgson, Peter D.
Journal name Materials science forum
Volume number 706-709
Start page 2332
End page 2337
Total pages 6
Publisher Trans Tech Publications
Place of publication Stafa-Zurich, Switzerland
Publication date 2012
ISSN 0255-5476
Keyword(s) nano-bainite
thermomechanical processing
bake-hardening
TEM
APT
Summary The influence of pre-straining and bake-hardening on the mechanical properties of thermomechanically processed 0.2C-1.5Si-1.5Mn-0.2Mo-0.004Nb (wt%) steel was analysed using tensile test, transmission electron microscopy (TEM) and atom probe tomography (APT). This steel after processing had high strength (~1200MPa) and good ductility (~20%) due to the formation of fully bainitic microstructure with nano-layers of bainitic ferrite and retained austenite. The bake hardening (BH) of pre-strained (PS) samples increased the yield strength of steel up to 690MPa and showed the bake-hardening response of 220MPa due to the operation of several strengthening mechanisms such as transformation induced plasticity during pre-straining and pinning the dislocations by carbon during bake-hardening treatment. The carbon content of the bainitic ferrite and retained austenite before and after bake-hardening treatment, the solute distribution between these phases and the local composition of fine Fe-C clusters and particles formed during bake-hardening treatment was calculated using APT. The bainitic ferrite and retained austenite microstructural characteristics such as thickness of the layers and their dislocation density before and after bake-hardening treatment were studied using TEM.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861103 Basic Iron and Steel Products
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, Trans Tech Publications, Switzerland
Persistent URL http://hdl.handle.net/10536/DRO/DU:30044343

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