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Transmission electron microscopy characterization of the bake-hardening behavior of transformation-induced plasticity and dual-phase steels

Timokhina, Ilana, Hodgson, Peter and Pereloma, E. 2007, Transmission electron microscopy characterization of the bake-hardening behavior of transformation-induced plasticity and dual-phase steels, Metallurgical and materials transactions A - Physical metallurgy and materials science, vol. 38, no. 10, pp. 2442-2454, doi: 10.1007/s11661-007-9258-7.

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Title Transmission electron microscopy characterization of the bake-hardening behavior of transformation-induced plasticity and dual-phase steels
Author(s) Timokhina, Ilana
Hodgson, Peter
Pereloma, E.
Journal name Metallurgical and materials transactions A - Physical metallurgy and materials science
Volume number 38
Issue number 10
Start page 2442
End page 2454
Publisher Minerals, Metals & Materials Society
Place of publication Warrendale, PA.
Publication date 2007-10
ISSN 1073-5623
1543-1940
Summary The effect of prestraining (PS) and bake hardening (BH) on the microstructures and mechanical properties has been studied in transformation-induced plasticity (TRIP) and dual-phase (DP) steels after intercritical annealing. The DP steel showed an increase in the yield strength and the appearance of the upper and lower yield points after a single BH treatment as compared with the as-received condition, whereas the mechanical properties of the TRIP steel remained unchanged. This difference appears to be because of the formation of plastic deformation zones with high dislocation density around the “as-quenched” martensite in the DP steel, which allowed carbon to pin these dislocations, which, in turn, increased the yield strength. It was found for both steels that the BH behavior depends on the dislocation rearrangement in ferrite with the formation of cell, microbands, and shear band structures after PS. The strain-induced transformation of retained austenite to martensite in the TRIP steel contributes to the formation of a complex dislocation structure.
Notes Published online: 29 August 2007
Language eng
DOI 10.1007/s11661-007-9258-7
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ┬ęThe Minerals, Metals & Materials Society and ASM International 2007
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007347

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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Created: Mon, 29 Sep 2008, 08:51:05 EST

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