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

Journal Article · Sat Jan 31 23:00:00 EST 1998 · Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/s11663-998-0019-9· OSTI ID:616162

Zajac, S ^[1]; Jansson, B ^[2]

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1. Swedish Inst. for Metals Research, Stockholm (Sweden)
2. SECO Tools AB, Fagersta (Sweden)

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.

• Sponsoring Organization: USDOE
• OSTI ID: 616162
• Journal Information: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science Journal Issue: 1 Vol. 29; ISSN MTBSEO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBONITRIDES
LOW ALLOY STEELS
METALLURGICAL EFFECTS
NIOBIUM
NIOBIUM COMPOUNDS
PRECIPITATION
SOLUBILITY
THERMODYNAMICS