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Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels

Timokhina, Ilana, Hodgson, Peter and Pereloma, E.V. 2004, Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels, Metallurgical and materials transactions. A, Physical metallurgy and materials science, vol. 35A, no. 8, pp. 2331-2341, doi: 10.1007/s11661-006-0213-9.

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Title Effect of microstructure on the stability of retained austenite in transformation-induced-plasticity steels
Author(s) Timokhina, Ilana
Hodgson, Peter
Pereloma, E.V.
Journal name Metallurgical and materials transactions. A, Physical metallurgy and materials science
Volume number 35A
Issue number 8
Start page 2331
End page 2341
Publisher ASM International
Place of publication Warrendale, Pa.
Publication date 2004-08
ISSN 1073-5623
1543-1940
Keyword(s) solid solutions
steel
metallography
impact analysis
strain
Summary Two Fe-0.2C-1.55Mn-1.5Si (in wt pet) steels, with and without the addition of 0.039Nb (in wt pet), were studied using laboratory rolling-mill simulations of controlled thermomechanical processing. The microstructures of all samples were characterized by optical metallography, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The microstructural behavior of phases under applied strain was studied using a heat-tinting technique. Despite the similarity in the microstructures of the two steels (equal amounts of polygonal ferrite, carbide-free bainite, and retained austenite), the mechanical properties were different. The mechanical properties of these transformation-induced-plasticity (TRIP) steels depended not only on the individual behavior of all these phases, but also on the interaction between the phases during deformation. The polygonal ferrite and bainite of the C-Mn-Si steel contributed to the elongation more than these phases in the C-Mn-Si-Nb-steel. The stability of retained austenite depends on its location within the microstructure, the morphology of the bainite, and its interaction with other phases during straining. Granular bainite was the bainite morphology that provided the optimum stability of the retained austenite.
Notes Copyright 2004 ASM International. This paper was published in Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 35A, Issue 8, pp. 2331-2341 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.
Language eng
DOI 10.1007/s11661-006-0213-9
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
Copyright notice ©2004, ASM International
Persistent URL http://hdl.handle.net/10536/DRO/DU:30002830

Document type: Journal Article
Collections: School of Engineering and Technology
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