Static Recrystallization and induced Precipitation in a Low Nb Microalloyed Steel

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Author(s)

    • GOMEZ M.
    • Centro Nacional de Investigaciones Metalurgicas (CENIM-CSIC)
    • MEDINA S. F.
    • Centro Nacional de Investigaciones Metalurgicas (CENIM-CSIC)
    • QUISPE A.
    • Centro Nacional de Investigaciones Metalurgicas (CENIM-CSIC)
    • VALLES P.
    • National Institute of Aerospace Technology, INTA

Abstract

By simulation of hot rolling using torsion tests and subsequent graphic representation of mean flow stress (MFS) versusthe inverse of temperature for each pass, no-recrystallization temperature (<i>T</i><sub>nr</sub>) was determined for a low niobium microalloyed steel at different interpass times and two strains of 0.20 and 0.35. Recrystallized fraction (<i>X</i><sub>a</sub>) against time curves and RPTT diagrams were also determined for these two strains. This work has allowed evaluation of the influence of a very low Nb content on three aspects: <i>T</i><sub>nr</sub>, the residual stress accumulated in the austenite just before the γ→α transformation (Δσ<sub>r</sub>), and recrystallization-precipitation interaction. It was found that when the strain applied was 0.2 and the interpass times were less than 30 s, the values of <i>T</i><sub>nr</sub> and Δσ<sub>r</sub> were rather high. However, greater strains and interpass times brought about very small values of <i>T</i><sub>nr</sub> and Δσ<sub>r</sub>. In addition to this, new aspects about the definition of <i>T</i><sub>nr</sub> are also discussed in this paper.

Journal

  • ISIJ International

    ISIJ International 42(4), 423-431, 2002-04-15

    The Iron and Steel Institute of Japan

References:  30

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