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Application of advanced experimental techniques for the microstructural characterization of nanobainitic steels

Timokhina, Ilana, Beladi, Hossein, Xiong, Xiang, Adachi, Yoshitaka and Hodgson, Peter 2011, Application of advanced experimental techniques for the microstructural characterization of nanobainitic steels, Solid state phenomena, vol. 172-174, pp. 1249-1254.

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Title Application of advanced experimental techniques for the microstructural characterization of nanobainitic steels
Author(s) Timokhina, Ilana
Beladi, Hossein
Xiong, Xiang
Adachi, Yoshitaka
Hodgson, Peter
Journal name Solid state phenomena
Volume number 172-174
Start page 1249
End page 1254
Total pages 6
Publisher Scitec Publications Ltd
Place of publication Uetikon-Zurich, Switzerland
Publication date 2011
ISSN 1012-0394
Keyword(s) APT
bainitic ferrite
high strength steels
nanos-tructured bainitic steel
retained austenite
TEM
TRIP effect
Summary A 0.79C-1.5Si-1.98Mn-0.98Cr-0.24Mo-1.06Al-1.58Co (wt%) steel was isothermally heat treated at 350°C bainitic transformation temperature for 1 day to form fully bainitic structure with nano-layers of bainitic ferrite and retained austenite, while a 0.26C-1.96Si-2Mn-0.31Mo (wt%) steel was subjected to a successive isothermal heat treatment at 700°C for 300 min followed by 350°C for 120 min to form a hybrid microstructure consisting of ductile ferrite and fine scale bainite. The dislocation density and morphology of bainitic ferrite, and retained austenite characteristics such as size, and volume fraction were studied using Transmission Electron Microscopy. It was found that bainitic ferrite has high dislocation density for both steels. The retained austenite characteristics and bainite morphology were affected by composition of steels. Atom Probe Tomography (APT) has the high spatial resolution required for accurate determination of the carbon content of the bainitic ferrite and retained austenite, the solute distribution between these phases and calculation of the local composition of fine clusters and particles that allows to provide detailed insight into the bainite transformation of the steels. The carbon content of bainitic ferrite in both steels was found to be higher compared to the para-equilibrium level of carbon in ferrite. APT also revealed the presence of fine C-rich clusters and Fe-C carbides in bainitic ferrite of both steels.
Notes Presented at the International Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM 2010)
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 ©2011, Trans Tech Publications, Switzerland
Persistent URL http://hdl.handle.net/10536/DRO/DU:30044212

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