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Model of Calculating Activity of Nitrogen and Vanadium in FeCVN Molten Metal

PENG Jun , WANG Shijun , DONG Yuanchi , LIU Lixia , ZHOU Yun , CHEN Erbao

钢铁研究学报(英文版)

The solubility of nitrogen in the FeCVN system was measured at 1 708 K and the model of calculating activity (action concentration) of nitrogen (N) and vanadium (V) was derived according to the phase diagram and the coexistence theory of the metal melt structure. The solubility expression of nitrogen in the FeCVN system at 1 708 K was wN=0058 194-0010 367wC+0005 543 4wV. Comparing the computing results with the experimental results, a satisfactory conclusion could be obtained. The analysis of the FeCVN system using this model showed that VN was present in a high temperature metal melt, which would reduce the action concentration of nitrogen obviously. It was consequently disadvantageous to the removal of nitrogen from hot metal.

关键词: metal melt;coexistence theory;action concentration;activity

Thermodynamic Properties of FeCN and FeCBN Melts

CHEN Erbao , WANG Shijun , DONG Yuanchi , WU Baoguo , ZHOU Yun

钢铁研究学报(英文版)

The saturated solubility of carbon and nitrogen in FeCN and FeCBN melts was measured experimentally at 1 485 ℃ to obtain the activity interaction coefficients between components in these melts. A new method was used to treat experimental results. Using thermodynamic derivation and calculation, some important interaction coefficients between components in these melts were obtained.

关键词: FeCN melt;FeCBN melt;FeCB melt;interaction coefficient;thermodynamic property

Thermodynamic Properties of Carbon and Manganese in MnC and MnFeC Melts

CHEN Erbao , WANG Shijun

钢铁研究学报(英文版)

Carbon solubility in MnFe melts (xMn=0083-0706, xFe=0034-0715) was measured experimentally at various temperatures. By thermodynamic derivation and calculation, the relationship between activity coefficient of carbon in infinite dilute solution of manganese in MnC system and temperature was obtained. Using GibbsDuhem relationship, the experimental results of this study, and experimental data obtained by strict thermodynamic derivation and calculation in references, the relationships between other thermodynamic properties (εCC, εCCC, εCFe, εCCFe, and εCFeFe) in MnFeC system and temperature were obtained.

关键词: MnFeC melt;activity interaction parameter;thermodynamic property;carbon;manganese

Relationship Between Activity Interaction Parameters in FeC System and Temperature

CHEN Erbao , LIU Maoliu , WANG Shijun

钢铁研究学报(英文版)

Carbon solubility in FeMn melts (xFe=0102 3-0789 9, xMn=0055 1-0638 0) was measured experimentally at various temperatures. Using GibbsDuhem equation, in combination with the experimental results in this work, quoting experimental data reported in references, and by strict thermodynamic derivation and calculation, the relation equations between the activity interaction parameters in FeC system and temperature were obtained. The calculation equation of lnγFe in FeC system was also obtained. The calculated results show that these relation equations can be used to calculate the activity coefficients of carbon and iron in FeC system and can satisfy the necessary condition to satisfy GibbsDuhem equation and the necessary condition to satisfy the stability condition of system at high carbon content. The calculation formula for lnγC in FeMnC system was also obtained.

关键词: FeC system;activity interaction parameter;activity coefficient;carbon

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