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

作　　者：WANG Shi-jun PENG Jun DONG Yuan-chi LIU Li-xia ZHOU Yun CHEN Er-bao 

机构地区：[1]School of Metallurgy and Resource, Anhui University of Technology, Maranshan 243002, Anhui, China [2]School ofMetallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

出　　处：《Journal of Iron and Steel Research International》2009年第3期15-19,共5页

基　　金：Sponsored by National Natural Science Foundation of China and Baosteel (50674001)

摘　　要：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.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 

分 类 号：TG711[金属学及工艺—刀具与模具] P593[天文地球—地球化学]