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The effect of simulated thermomechanical processing on the transformation behavior and microstructure of a low-carbon Mo-Nb linepipe steel

Cizek,P, Wynne,BP, Davies,CHJ and Hodgson,PD 2015, The effect of simulated thermomechanical processing on the transformation behavior and microstructure of a low-carbon Mo-Nb linepipe steel, Metallurgical and materials transactions A: physical metallurgy and materials science, vol. 46, no. 1, pp. 407-425, doi: 10.1007/s11661-014-2601-x.

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Title The effect of simulated thermomechanical processing on the transformation behavior and microstructure of a low-carbon Mo-Nb linepipe steel
Author(s) Cizek,P
Wynne,BP
Davies,CHJ
Hodgson,PD
Journal name Metallurgical and materials transactions A: physical metallurgy and materials science
Volume number 46
Issue number 1
Start page 407
End page 425
Publisher Springer
Place of publication New York, NY
Publication date 2015-01
ISSN 1073-5623
Keyword(s) Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
ELECTRON BACKSCATTERED DIFFRACTION
CONTINUOUS COOLING TRANSFORMATION
CHARPY IMPACT PROPERTIES
HOT DEFORMATION
SUBSTRUCTURE CHARACTERISTICS
MECHANICAL-PROPERTIES
PHASE-TRANSFORMATION
MICROALLOYED STEELS
ACICULAR FERRITE
BAINITIC STEELS
Summary The present work investigates the transformation behavior of a low-carbon Mo-Nb linepipe steel and the corresponding transformation product microstructures using deformation dilatometry. The continuous cooling transformation (CCT) diagrams have been constructed for both the fully recrystallized austenite and that deformed in uniaxial compression at 1148 K (875 °C) to a strain of 0.5 for cooling rates ranging from 0.1 to about 100 K/s. The obtained microstructures have been studied in detail using electron backscattered diffraction complemented by transmission electron microscopy. Heavy deformation of the parent austenite has caused a significant expansion of the polygonal ferrite transformation field in the CCT diagram, as well as a shift in the non-equilibrium ferrite transformation fields toward higher cooling rates. Furthermore, the austenite deformation has resulted in a pronounced refinement in both the effective grain (sheaf/packet) size and substructure unit size of the non-equilibrium ferrite microstructures. The optimum microstructure expected to display an excellent balance between strength and toughness is a mix of quasi-polygonal ferrite and granular bainite (often termed “acicular ferrite”) produced from the heavily deformed austenite within a processing window covering the cooling rates from about 10 to about 100 K/s.
Language eng
DOI 10.1007/s11661-014-2601-x
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861206 Structural Metal Products
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30068128

Document type: Journal Article
Collection: Institute for Frontier Materials
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