Determination of activity interaction parameters of Nb in Fe–C–Nb melts at 1873 K

The interaction parameters of Nb in Fe–C–Nb melts at 1873 K were measured using the chemical equilibrium method. The Fe–C melts were equilibrated with the CaO–MgO–Al 2 O 3 –NbO 2 slags under a controlled oxygen potential for 24 h. In addition to acting as the protective gas, argon was adopted to con...

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Bibliographic Details
Published in:Journal of iron and steel research, international international, 2022-03, Vol.29 (3), p.403-407
Main Authors: Zhang, Jie, Wang, Da-ya, Yan, Bai-jun
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Engineering
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Processes
Short Communication
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Summary:The interaction parameters of Nb in Fe–C–Nb melts at 1873 K were measured using the chemical equilibrium method. The Fe–C melts were equilibrated with the CaO–MgO–Al 2 O 3 –NbO 2 slags under a controlled oxygen potential for 24 h. In addition to acting as the protective gas, argon was adopted to control the oxygen potential. Based on the data obtained in the experiments, the activity interaction parameters were obtained by the multiple linear regression method. The first-order interaction parameters e Nb C and e Nb Nb are determined to be − 0.035 and − 0.134, respectively. The second-order interaction parameters r Nb C , r Nb Nb,C , and r Nb Nb are determined to be 0.011, − 0.0063, and 0.0023, respectively. The thermodynamic data obtained are more reliable than those in previous publications for the Fe–C–Nb system when the Nb content range was 0.92–4.62 wt.%.
ISSN:1006-706X
2210-3988
DOI:10.1007/s42243-021-00649-4