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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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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DOI: https://doi.org/10.1007/s11663-998-0019-9