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Growth of bainitic ferrite and carbon partitioning during the early stages of bainite transformation in a 2 mass% silicon steel studied by in situ neutron diffraction, TEM and APT

Timokhina, IB, Liss, KD, Raabe, D, Rakha, K, Beladi, H, Xiong, XY and Hodgson, PD 2016, Growth of bainitic ferrite and carbon partitioning during the early stages of bainite transformation in a 2 mass% silicon steel studied by in situ neutron diffraction, TEM and APT, Journal of applied crystallography, vol. 49, pp. 399-414, doi: 10.1107/S1600576716000418.

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Title Growth of bainitic ferrite and carbon partitioning during the early stages of bainite transformation in a 2 mass% silicon steel studied by in situ neutron diffraction, TEM and APT
Author(s) Timokhina, IB
Liss, KD
Raabe, D
Rakha, K
Beladi, HORCID iD for Beladi, H orcid.org/0000-0003-0131-707X
Xiong, XY
Hodgson, PD
Journal name Journal of applied crystallography
Volume number 49
Start page 399
End page 414
Total pages 16
Publisher International Union of Crystallography
Place of publication Paris, France
Publication date 2016-01-01
ISSN 0021-8898
1600-5767
Keyword(s) neutron diffraction
transmission electron microscopy
atom probe tomography
bainite transformation
bainitic ferrite
retained austenite
carbon content
Summary In situ neutron diffraction, transmission electron microscopy (TEM) and atom probe tomography (APT) have been used to study the early stages of bainite transformation in a 2 mass% Si nano-bainitic steel. It was observed that carbon redistribution between the bainitic ferrite and retained austenite at the early stages of the bainite transformation at low isothermal holding occurred in the following sequence: (i) formation of bainitic ferrite nuclei within carbon-depleted regions immediately after the beginning of isothermal treatment; (ii) carbon partitioning immediately after the formation of bainitic ferrite nuclei but substantial carbon diffusion only after 33 min of bainite isothermal holding; (iii) formation of the carbon-enriched remaining austenite in the vicinity of bainitic laths at the beginning of the transformation; (iv) segregation of carbon to the dislocations near the austenite/ferrite interface; and (v) homogeneous redistribution of carbon within the remaining austenite with the progress of the transformation and with the formation of bainitic ferrite colonies. Bainitic ferrite nucleated at internal defects or bainite/austenite interfaces as well as at the prior austenite grain boundary. Bainitic ferrite has been observed in the form of an individual layer, a colony of layers and a layer with sideplates at the early stages of transformation.
Language eng
DOI 10.1107/S1600576716000418
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, International Union of Crystallography
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083279

Document type: Journal Article
Collections: Institute for Frontier Materials
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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.