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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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INFILTRATION KINETICS MODEL OF LIQUID metal INTO A FIBROUS PREFORM IN CENTRIFUGAL ACCELERATING FIELD

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Chinese Journal of Mechanical Engineering 2001年第4期14卷 293-296页

作者： Zhang Xinping,Yu Sirong,He Zhenming (College of Materials Science and Engineering,Jilin University) 吉林大学吉林

The infiltration kinetics of the metal melt into a fibrous preform in centrifugal accelerating field is analyzed on the basis of Darcy's law and the assumption that the fibrous preform is treated as 'bundle of capillaries' The critical rotating speed is analyzed with the established model The influences of the metal melt mass,the rotating speed of the equipment,the casting height, the original outer radius of the metal melt and the fibrous volume fraction in fibrous preform on infilatration are studied The results show that the critical rotating speed is dependent on critical pressure, casting height, metal melt mass and the character of fibrous preform With the increase in the metal melt mass, rotating speed of the equipment and original outer radius of the metal melt, or the decrease in casting height and fibrous volume fraction in fibrous of the metal melt,or the decrease in casting height and fibrous volume fraction in fibrous preform,infiltration of metal melt for fibrous preform becomes easier.

关键词： Centrifugal accelerating field metal melt Fiber Infiltration kinetics metal matrix composite

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