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

Journal of Iron and Steel Research International 2008年第5期15卷 19-23页

作者： PENG Jun WANG Shi-jun DONG Yuan-chi LIU Li-xia ZHOU Yun CHEN Er-bao School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 Beijing China School of Metallurgy and Resource Anhui University of Technology Ma＇anshan 243002 Anhui China

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 ωN =0. 058 194-0. 010 367ωc＋0. 005 543 4ωv. Comparing the computing results with the experimental resuits, 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

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Thermodynamic Model for Calculating Activity of Nitrogen and Boron in Fe-C-B-N Molten Metal

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Journal of Iron and Steel Research International 2009年第3期16卷 15-19页

作者： WANG Shi-jun PENG Jun DONG Yuan-chi LIU Li-xia ZHOU Yun CHEN Er-bao School of Metallurgy and Resource Anhui University of Technology Maranshan 243002 Anhui China School ofMetallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The solubility of nitrogen in Fe-C-B-N system was measured at 1 758 K,and the computational model on activity （action concentration） of nitrogen and boron was established based on phase diagram and the coexistence theory about metal melt structure model. Comparing the computed results with the experimental results,satisfactory conclusion can be obtained. The result shows that BN and B4C can exist in Fe-C-B-N molten metal at high temperature,which consequently restrains the nitrogen removal from the melt. However,B4C content is extremely low. Before graphite is precipitated,the influence of carbon on activity of nitrogen in melt is higher in ternary system than in binary system; however,this effect is contrary to that after graphite is precipitated.

关键词： molten metal coexistence theory action concentration activity

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