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Effect of alloying elements on metadynamic recrystallization in HSLA steels

  • Mechanical Behavior
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Abstract

By means of interrupted torsion tests, the kinetics of metadynamic recrystallization (MDRX) were studied in a Mo, a Nb, and a Ti microalloyed steel at temperatures ranging from 850 °C to 1000 °C and strain rates from 0.02 to 2 s1. Quenches were also performed after full MDRX. In contrast to the case of static recrystallization (SRX), the kinetics of MDRX are shown to be highly sensitive to a change of an order of magnitude in strain rate and are relatively insensitive to temperature changes within the range of values applicable to industrial hot-rolling practice. A similar algebraic dependence of the MDRX grain size on strain rate and temperature was found in the three steels. The kinetics of MDRX were slower in the Nb than in the Mo steel, and those of the Ti steel were slower than in the Nb and Mo steels. Above 900 °C and 950 °C, the retardation of MDRX in the Nb and Ti steels, respectively, is due to solute drag. Models predicting the start time for Nb and Ti carbonitride precipitation showed that MDRX is delayed below these temperatures by this mechanism. Comparison of the MDRX and precipitation start times in the Nb steel indicated that a temperature of “no-MDRX” could not be defined, in contrast to the well-definedT nr (no recrystallization temperature) of SRX. By means of torsion simulations composed of multiple interruptions, it is shown that MDRX is retarded decreasingly as the accumulated strain is increased. This appears to be due to the promotion of precipitate coarsening by the continuing deformation.

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Authors and Affiliations

  1. BHP Research Laboratories, 3170, Mulgrave, Victoria, Australia

    C. Roucoules (Postdoctoral Fellow)

  2. Department of Metallurgical Engineering, McGill University, H3A 2A7, Montreal, PQ, Canada

    S. Yue (Assistant Professor) & J. J. Jonas (Professor)

Authors
  1. C. Roucoules
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  2. S. Yue
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  3. J. J. Jonas
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Roucoules, C., Yue, S. & Jonas, J.J. Effect of alloying elements on metadynamic recrystallization in HSLA steels. Metall Mater Trans A 26, 181–190 (1995). https://doi.org/10.1007/BF02669803

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