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The formation of ultrafine ferrite and low temperature bainite through thermomechanical processing

journal contribution
posted on 2012-01-01, 00:00 authored by Hossein BeladiHossein Beladi, Ilana Timokhina, Peter HodgsonPeter Hodgson
In the current study, a novel approach was employed to produce a unique combination of ultrafine ferrite grains and low temperature bainite in a low carbon steel with a high hardenability. The thermomechanical route included warm deformation of supercooled austenite followed by reheating in the ferrite region and then cooling to bainitic transformation regime (i.e. 400-250°C). The resultant microstructure was ultrafine ferrite grains (i.e. <4μm) and very fine bainite consisting of bainitic ferrite laths with high dislocation density and retained austenite films. This microstructure offers a unique combination of ultimate tensile strength and elongation due to the presence of ductile fine ferrite grains and hard low temperature bainitic ferrite laths with retained austenite films. The microstructural characteristics of bainite were studied using optical microscopy in conjunction with scanning and transmission electron microscopy techniques.

History

Journal

Materials science forum

Volume

706-709

Pagination

2047 - 2052

Publisher

Trans Tech Publications

Location

Stafa-Zurich, Switzerland

ISSN

0255-5476

Language

eng

Notes

Presented at the 7th International Conference on Processing and Manufacturing of Advanced Materials (THERMEC 2011)

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2012, Trans Tech Publications

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