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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