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A Novel Mo and Nb Microalloyed Medium Mn TRIP Steel with Maximal Ultimate Strength and Moderate Ductility

Cai, Minghui, Li, Zhun, Chao, Qi and Hodgson, Peter D 2014, A Novel Mo and Nb Microalloyed Medium Mn TRIP Steel with Maximal Ultimate Strength and Moderate Ductility, Metallurgical and materials transactions A: Physical metallurgy and materials science, vol. 45, no. 12, pp. 5624-5634, doi: 10.1007/s11661-014-2504-x.

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Title A Novel Mo and Nb Microalloyed Medium Mn TRIP Steel with Maximal Ultimate Strength and Moderate Ductility
Author(s) Cai, Minghui
Li, Zhun
Chao, Qi
Hodgson, Peter D
Journal name Metallurgical and materials transactions A: Physical metallurgy and materials science
Volume number 45
Issue number 12
Start page 5624
End page 5634
Total pages 11
Publisher Springer
Place of publication New York, NY
Publication date 2014-11
ISSN 1073-5623
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
INDUCED PLASTICITY STEEL
LOW-CARBON STEEL
MECHANICAL-PROPERTIES
DYNAMIC RECRYSTALLIZATION
REVERSE TRANSFORMATIONS
AUSTENITE STABILITY
INDUCED MARTENSITE
GRAIN-SIZE
MICROSTRUCTURE
ALLOY
Summary The multi-phase, metastable, and multi-scale (M3) constitution of a novel transformation-induced plasticity (TRIP) steel (Fe-0.17C-6.5Mn-1.1Al-0.22Mo-0.05Nb, wt pct) was designed through thermodynamic calculations combined with experimental analysis. In this study, Mo and Nb microalloying was used to control the fraction of retained austenite and its mechanical stability during tensile deformation and to improve the yield strength. Thermodynamic calculations were developed to determine the critical annealing temperature, at which a large fraction of retained austenite (~38 pct) would be obtained through the effects of solute enrichment. The experimental observation was in good agreement with the predicted results. According to the critical annealing temperature, such an ultrafine (<200 nm) M3, microstructure with optimum mechanical stability was successfully achieved. The results of this work demonstrated the superior performance with improved yield strength of 1020 to 1140 MPa and excellent ductility (>30 pct), as compared with other TRIP steels. Both angle-selective backscatter and electron backscatter diffraction techniques were employed to interpret the transformation from the deformed martensitic laths to the ultrafine austenite and ferrite duplex structure.
Language eng
DOI 10.1007/s11661-014-2504-x
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
ERA Research output type C Journal article
Copyright notice ©2014, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070427

Document type: Journal Article
Collection: Institute for Frontier Materials
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