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Thermodynamics of the Fe-Nb-C-N system and the solubility of niobium carbonitrides in austenite

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Abstract

The solubility of niobium in microalloyed austenite has been analyzed using a thermodynamic description of the Fe-Nb-C-N system. The description of this system forms an important basis for calculations of precipitation of niobium carbonitrides in microalloyed steels. Previously presented thermodynamic descriptions are combined with a new description of the Fe-Nb-N system, and equilibria in the quaternary system are calculated. New experiments were performed on Nb, Nb-Ti, and Nb-Ti-V microalloyed steels to confirm the calculated results. The results of theoretical calculations show good agreement with the experimental data on dissolution/precipitation of Nb carbonitrides in microalloyed austenite.

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Abbreviations

Va :

Vacant interstitial sites

y i :

site fraction of the component i (i represents Fe, Nb, N, or Va)

M:

represents the element Nb or Fe

0 G M :

Gibbs energy of the pure element M in a hypothetical nonmagnetic state

0 G VaM:N :

Gibbs energy of a hypothetical state where all interstitial sites are filled with N

0 G liqM :

Gibbs energy of liquid M

E G m :

excess Gibbs energy

mg G m :

magnetic contribution to the Gibbs energy

L A,B:C :

parameter representing the interaction between A and B with C on the second sublattice

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Authors and Affiliations

  1. Quantitative Metallography-Structures and Properties, Mechanical Metallurgy Department, Swedish Institute for Metals Research, S-114 28, Stockholm, Sweden

    S. Zajac (Group Leader)

  2. Metallurgical Development, SECO Tools AB, S-73782, Fagersta, Sweden

    B. Jansson (Senior Research Scientist)

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  1. S. Zajac
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  2. B. Jansson
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Zajac, S., Jansson, B. Thermodynamics of the Fe-Nb-C-N system and the solubility of niobium carbonitrides in austenite. Metall Mater Trans B 29, 163–176 (1998). https://doi.org/10.1007/s11663-998-0019-9

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