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On the low temperature strain aging of bainite in the TRIP steel

Timokhina, Ilana, Beladi, Hossein, Xiong, Xiang-Yuan and Hodgson, Peter D. 2013, On the low temperature strain aging of bainite in the TRIP steel, Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, vol. 44, no. 11, pp. 5177-5191, doi: 10.1007/s11661-013-1864-y.

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Title On the low temperature strain aging of bainite in the TRIP steel
Author(s) Timokhina, Ilana
Beladi, Hossein
Xiong, Xiang-Yuan
Hodgson, Peter D.
Journal name Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume number 44
Issue number 11
Start page 5177
End page 5191
Total pages 15
Publisher Springer
Place of publication Berlin, Germany
Publication date 2013
ISSN 1073-5623
1543-1940
Summary The aging behavior of a thermomechanically processed Mo-Al-Nb transformation-induced plasticity steel with ultrafine microstructure was investigated using transmission electron microscopy and atom probe tomography (APT). Strain aging at 73 K (200 °C) for 1800 seconds led to a significant bake-hardening response (up to 222 MPa). Moreover, aging for 1800 seconds at room temperature after 4 pct pre-strain also revealed a bake-hardening response (~60 MPa). The experimental results showed the formation of carbon Cottrell atmospheres around dislocations and the formation of carbon clusters/fine carbides in the bainitic ferrite during aging. It is proposed that this is associated with the high dislocation density of bainitic ferrite with formation of a complex dislocation substructure after pre-straining and its high average carbon content (~0.35 at. pct). The segregation of carbon and substitutional elements such as Mn and Mo to the retained austenite/bainitic ferrite interface during aging was observed by APT. This segregation is likely to be the preliminary stage for Mo-C particles’ formation. The aging after pre-straining also induced the decomposition of retained austenite with formation of ferrite and carbides.
Language eng
DOI 10.1007/s11661-013-1864-y
Field of Research 109999 Technology not elsewhere classified
Socio Economic Objective 970110 Expanding Knowledge in Technology
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
HERDC collection year 2013
Copyright notice ©2013, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30055367

Document type: Journal Article
Collection: Institute for Frontier Materials
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Citation counts: TR Web of Science Citation Count  Cited 3 times in TR Web of Science
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Created: Tue, 27 Aug 2013, 12:07:42 EST

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