Multi-phase microstructure design of a novel high strength TRIP steel through experimental methodology

Wang,C, Ding,H, Cai,M and Rolfe,B 2014, Multi-phase microstructure design of a novel high strength TRIP steel through experimental methodology, Materials science and engineering a, vol. 610, pp. 436-444, doi: 10.1016/j.msea.2014.05.063.

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Title Multi-phase microstructure design of a novel high strength TRIP steel through experimental methodology
Author(s) Wang,C
Ding,H
Cai,M
Rolfe,BORCID iD for Rolfe,B orcid.org/0000-0001-8516-6170
Journal name Materials science and engineering a
Volume number 610
Start page 436
End page 444
Publisher Elsevier BV
Place of publication Amsterdam, Netherlands
Publication date 2014-07-29
ISSN 0921-5093
Keyword(s) Alloying element
Intercritical annealing
Isothermal bainitic transformation
Retained austenite
TRIP effect
Science & Technology
Technology
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Science & Technology - Other Topics
Materials Science
INDUCED PLASTICITY STEELS
AIDED SHEET STEELS
MECHANICAL-PROPERTIES
PHASE-TRANSFORMATION
SI
NB
AL
DEFORMATION
STABILITY
Summary The multi-phase structure of a novel low-alloy transformation induced plasticity (TRIP) steel was designed through experimental analysis. The evolutions of both microstructure and mechanical properties during the two-stage heat treatment were analyzed. The phase transformations during the intercritical annealing and the isothermal bainitic transformation were investigated by means of dilatometry. It was shown that two types of C diffusion were detected during intercritical annealing and a complex microstructure was formed after heat treatment. The processing parameters were selected in such a way to obtain microstructures with systematically different volume fractions of ferrite, bainite and retained austenite. The volume fractions of ferrite and retained austenite were found to be two main factors controlling the ductility. Furthermore, a high volume fraction of C-rich retained austenite, which was stabilized at room temperature, was the origin of a TRIP effect. The resulting material demonstrates a significant improvement in the ultimate tensile strength (1077. MPa) with good uniform elongation (22.5%), as compared to conventional TRIP steels. © 2014 Elsevier B.V.
Language eng
DOI 10.1016/j.msea.2014.05.063
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861103 Basic Iron and Steel Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier BV
Persistent URL http://hdl.handle.net/10536/DRO/DU:30071529

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