Determination of activity interaction parameters of Nb in Fe–C–Nb melts at 1873 K
Jie Zhang1, Da-ya Wang2, Bai-jun Yan1
1 State Key Laboratory of Advanced Metallurgy, Department of Physical Chemistry of Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Sinosteel Maanshan General Institute of Mining Research Co., Ltd., Ma’anshan 243000, Anhui, China
Determination of activity interaction parameters of Nb in Fe–C–Nb melts at 1873 K
Jie Zhang1, Da-ya Wang2, Bai-jun Yan1
1 State Key Laboratory of Advanced Metallurgy, Department of Physical Chemistry of Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Sinosteel Maanshan General Institute of Mining Research Co., Ltd., Ma’anshan 243000, Anhui, China
摘要 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–Al2O3–NbO2 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 eCNb and eNbNb are determined to be - 0.035 and - 0.134, respectively. The second-order interaction parameters rCNb, rNb,CNb, and rNbNb 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.%.
Abstract：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–Al2O3–NbO2 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 eCNb and eNbNb are determined to be - 0.035 and - 0.134, respectively. The second-order interaction parameters rCNb, rNb,CNb, and rNbNb 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.%.
Jie Zhang,Da-ya Wang,Bai-jun Yan. Determination of activity interaction parameters of Nb in Fe–C–Nb melts at 1873 K[J]. Journal of Iron and Steel Research International, 2022, 29(3): 403-407.
2022, Vol. 29 
