The influence of fine ferrite formation on the γ/α interface, fine bainite and retained austenite in a thermomechanically-processed transformation induced plasticity steel

Timokhina, Ilana B., Miller, Michael K., Beladi, Hossein and Hodgson, Peter D. 2016, The influence of fine ferrite formation on the γ/α interface, fine bainite and retained austenite in a thermomechanically-processed transformation induced plasticity steel, Journal of materials research, vol. 31, no. 6, pp. 806-818, doi: 10.1557/jmr.2016.73.

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Title The influence of fine ferrite formation on the γ/α interface, fine bainite and retained austenite in a thermomechanically-processed transformation induced plasticity steel
Author(s) Timokhina, Ilana B.ORCID iD for Timokhina, Ilana B. orcid.org/0000-0003-1989-0835
Miller, Michael K.
Beladi, HosseinORCID iD for Beladi, Hossein orcid.org/0000-0003-0131-707X
Hodgson, Peter D.
Journal name Journal of materials research
Volume number 31
Issue number 6
Start page 806
End page 818
Total pages 13
Publisher Cambridge University Press
Place of publication Cambridge, Eng.
Publication date 2016-03-28
ISSN 0884-2914
2044-5326
Keyword(s) fine ferrite
fine bainite
retained austenite
γ/α interface
atom probe tomography
transmission electron microscopy
Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
FE-C-MN
ATOM-PROBE TOMOGRAPHY
DUAL-PHASE STEELS
TRANSMISSION ELECTRON-MICROSCOPY
HIGH-STRENGTH STEELS
TRIP STEELS
MECHANICAL-PROPERTIES
CARBON-STEELS
ULTRAFINE FERRITE
GROWTH-KINETICS
Summary An Fe-0.26C-1.96Si-2Mn with 0.31Mo (wt%) steel was subjected to a novel thermomechanical processing route to produce fine ferrite with different volume fractions, bainite, and retained austenite. Two types of fine ferrites were found to be: (i) formed along prior austenite grain boundaries, and (ii) formed intragranularly in the interior of austenite grains. An increase in the volume fraction of fine ferrite led to the preferential formation of blocky retained austenite with low stability, and to a decrease in the volume fraction of bainite with stable layers of retained austenite. The difference in the morphology of the bainitic ferrite and the retained austenite after different isothermal ferrite times was found to be responsible for the deterioration of the mechanical properties. The segregation of Mn, Mo, and C at distances of 2-2.5 nm from the ferrite and retained austenite/martensite interface on the retained austenite/martensite site was observed after 2700 s of isothermal hold. It was suggested that the segregation occurred during the austenite-to-ferrite transformation, and that this would decrease the interface mobility, which affects the austenite-to-ferrite transformation and ferrite grain size.
Language eng
DOI 10.1557/jmr.2016.73
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0204 Condensed Matter Physics
0913 Mechanical Engineering
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, Materials Research Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083215

Document type: Journal Article
Collections: Institute for Frontier Materials
GTP Research
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