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Precipitation behavior in a medium carbon, ti-v-n microalloyed steel

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Abstract

The precipitation behavior of a medium carbon steel microalloyed with Ti, V, and N has been studied by analytical transmission electron microscopy in the as-cast and isothermally heat-treated states, as well as at different stages in the thermomechanical processing of the steel. Mixed (Ti,V) nitrides were found in all the structures, but there was no evidence for mixed carbonitride formation. The Hillert-Staffansson model was used to predict the composition of the nitrides as a function of tem-perature. Upon prolonged aging many of the precipitates became “fragmented” and were no longer single crystals. At the same time, the volume fraction of precipitates dropped, while their average Ti content increased. Possible explanations for this unexpected behavior are discussed in this article.

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Abbreviations

0G A:VA =:

Gibbs free energy of pure element A with respect to the enthalpy of selected reference state for the element at 298.15 K.

0C A:B =:

Gibbs free energy of hypothetical compound where all the substitutional sites are occupied by element A and all the interstitial sites by element B.

0,1L A:B,C =:

Concentration-dependent interaction parameters of the first order in the Hillert-Staffansson model. They describe the interaction between elements A and B when all sites in the second sublattice are occupied by the element C.

L {A:B,C:D} =:

Interaction parameter of higher order in the Hillert-Staffansson model. It describes the interaction between elements A and B when the sites in the second sublattice are occupied by elements C and D.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, McMaster University, L8S 4ML, Hamilton, ON, Canada

    M. Prikryl (Research Associate), G. C. Weatherly (Professor) & S. V. Subramanian (Professor)

  2. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, 616062, Brno, Czech Republic

    A. Kroupa (Research Associate)

Authors
  1. M. Prikryl
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  2. A. Kroupa
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  3. G. C. Weatherly
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  4. S. V. Subramanian
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Prikryl, M., Kroupa, A., Weatherly, G.C. et al. Precipitation behavior in a medium carbon, ti-v-n microalloyed steel. Metall Mater Trans A 27, 1149–1165 (1996). https://doi.org/10.1007/BF02649854

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  • DOI: https://doi.org/10.1007/BF02649854

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