Quasi in-situ analysis of geometrically necessary dislocation density in α-fibre and γ-fibre during static recrystallization in cold-rolled low-carbon Ti-V bearing microalloyed steel

Ishwar Kapoor, Yongjun Lan, Arjan Rijkenberg, Zushu Li, Vit Janik

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Abstract

In the present study, cold-rolled low-carbon steel is annealed at three different conditions: 700 oC for 0 s, 800 oC for 0 s and 800 oC for 2 min at the heating rate of ~10 oC/s. Recrystallization behaviour on sample surface is studied using a heated stage Scanning Electron Microscopy and Electron Backscattered Diffraction. For the lower annealing temperature of 700 oC with no dwell, almost no recrystallization is observed and microstructure resembles the as-received deformed material with the exception of occasional sub-micron sized nuclei. For the annealing conditions of 800 oC 0 s and 800 oC 2 min, onset and evolution of recrystallization is observed in-situ as a function of the initial as-cold rolled texture. Slower recovery rate of alpha fibre than gamma fibre is observed and confirmed by lower drop in average geometrically necessary dislocation (GND) density for un-recrystallized alpha fibres (1.1E+14 m-2 for 700 oC 0 s , 1.4E+14 m-2 for 800 oC 0 s and 4.5E+14 m-2 for 800 oC 2 min) than for un-recrystallized gamma fibre grains (3.0E+14 m-2 for 700 oC 0 s , 6.2E+14 m-2 for 800 oC 0 s and 9.8E+14 m-2 for 800 oC 2 min) during annealing. Strong gamma texture in recrystallized matrix is found for annealing conditions of 800 oC 0 s and 800 oC 2 min. From TEM characterisation it was shown that sub-grain boundaries are decorated with fine precipitates (diameter d < 15 nm) of titanium-vanadium carbides (Ti,V)C for the annealing condition of 700 oC 0 s, which suggests that these precipitates play a major overall role in retardation of the recrystallization kinetics.
Original languageEnglish
Pages (from-to)686-696
Number of pages11
JournalMaterials Characterization
Volume145
Early online date21 Sep 2018
DOIs
Publication statusPublished - 1 Nov 2018

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in
Materials Characterization. Changes resulting from the publishing process, such as
peer review, editing, corrections, structural formatting, and other quality control
mechanisms may not be reflected in this document. Changes may have been made
to this work since it was submitted for publication. A definitive version was
subsequently published in Materials Characterization, Vol 145, 2018. DOI:
10.1016/j.matchar.2018.09.032
© 2017, Elsevier. Licensed under the Creative Commons AttributionNonCommercial-NoDerivatives
4.0 International
http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Annealing
  • Recovery
  • Recrystallization
  • Grain growth
  • Geometrically necessary dislocations

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