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Understanding of the bainite transformation in a nano-structured bainitic steel

Hodgson, Peter, Timokhina, Ilana, Xiong, Xiang, Adach, Yoshitaka and Beladi, Hossein 2011, Understanding of the bainite transformation in a nano-structured bainitic steel, Solid state phenomena, vol. 172-174, pp. 123-128.

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Title Understanding of the bainite transformation in a nano-structured bainitic steel
Author(s) Hodgson, Peter
Timokhina, Ilana
Xiong, Xiang
Adach, Yoshitaka
Beladi, Hossein
Journal name Solid state phenomena
Volume number 172-174
Start page 123
End page 128
Total pages 6
Publisher Scitec Publications Ltd
Place of publication Uetikon-Zurich, Switzerland
Publication date 2011
ISSN 1012-0394
Keyword(s) APT
EBSD
high strength steels
nanostructured bainitic steel
TEM
Summary A 0.79C-1.5Si-1.98Mn-0.98Cr-0.24Mo-1.06Al-1.58Co (wt%) steel was isothermally heat treated at 200°C for 10 days to form a nano-scale bainitic microstructure consisting of nanobainitic ferrite laths with high dislocation density and retained austenite films. The crystallographic analysis using TEM and EBSD revealed that the bainitic ferrite laths are close to the Nishiyama-Wassermann orientation relationship with the parent austenite. There was only one type of packet identified in a given transformed austenite grain. Each packet consisted of two different blocks having variants with the same habit plane, but different crystallographic orientations. The presence of fine C-rich clusters and Fe-C carbides with a wide range of compositions in bainitic ferrite was revealed by Three-dimensional Atom Probe Tomography (APT). The high carbon content of bainitic ferrite compared to the para-equilibrium level of carbon in ferrite, absence of segregation of carbon to the austenite/bainitic ferrite interface and absence of partitioning of substitutional elements between the retained austenite and bainitic ferrite were also found using APT.
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:30044166

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