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Continuous cooling transformation temperatures determined by compression tests in low carbon bainitic grades

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Abstract

The transformation behaviors of six steels containing microalloying additions of B, Nb, and Mo were investigated under continuous cooling conditions. Continuous cooling compression (CCC) tests were employed to study the effects of chemical composition (mainly, Nb, Mo, and B) and deformation parameters (reheat temperature, prestrain, and holding time) on the transformation temperatures (A r3 and B s). It was found that for the Mo-Nb-B, Mo-B, and B steels, the transformation temperatures are relatively stable, and vary in a range of about 20 °C when the reheat temperature is changed from 900 °C to 1200 °C. Both the stress-temperature curves and the associated microstructures show that transformation in the Mo-Nb-B steel is basically of the γ-to-B type; i.e., the resulting microstructure is low carbon bainite. By contrast, for the Nb-B steels, the transformation temperatures vary significantly when the reheat temperature is changed. The concentration of boron in solution strongly affects the transformation behavior of this type of steel. In the Nb-48B steel, the latter is of the γ-to-B type, while in grades with either higher (Nb-64B) or lower (Nb-15B) boron concentrations, it is mainly of the γ-to-α type. Large Fe23(C,B)6 particles, which were found at low reheat temperatures and long holding times, are considered to be responsible for raising the transformation temperatures.

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Author notes

  1. T. M. Maccagno

    Present address: the Department of Metallurgical Engineering, McGill University, H3A 2B2, Montreal, PQ, Canada

Authors and Affiliations

  1. the Department of Metallurgical Engineering, McGill University, H3A 2B2, Montreal, PQ, Canada

    D. Q. Bai (Postdoctoral Fellow), S. Yue (Associate Professor) & J. J. Jonas (Professor)

  2. the Department of Chemical and Materials Engineering, University of Alberta, T6G 2G6, Edmonton, AB, Canada

    T. M. Maccagno

Authors
  1. D. Q. Bai
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  2. S. Yue
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  3. J. J. Jonas
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  4. T. M. Maccagno
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Bai, D.Q., Yue, S., Jonas, J.J. et al. Continuous cooling transformation temperatures determined by compression tests in low carbon bainitic grades. Metall Mater Trans A 29, 989–1001 (1998). https://doi.org/10.1007/s11661-998-0291-y

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