THERMODYNAMICAL STUDY OF INTERACTION BETWEEN NITROGEN AND Ce OR Y IN LIQUID IRON
YUE Kexiang DU Ting LI jizong SHEN Rumei (Central Iron and Steel Research Institute;Ministry of Metallurgical Industry;Beijing)
Cite this article:
YUE Kexiang DU Ting LI jizong SHEN Rumei (Central Iron and Steel Research Institute;Ministry of Metallurgical Industry;Beijing). THERMODYNAMICAL STUDY OF INTERACTION BETWEEN NITROGEN AND Ce OR Y IN LIQUID IRON. Acta Metall Sin, 1987, 23(1): 99-102.
Abstract Equilibria of the Fe-Ce-N and Fe-Y-N melts with very low oxygen and sulphur conte- nts have been investigated at 1570—1650℃.The equilibriun products are examined to be CeN and YN respectively.The temperature dependences on their interaction coefficients are determined to be: e_N~(Ce)=-(6230/T)+2.670;e_(Ce)~N=-(62281/T)+26.64 e_N~Y=-(6640/T)+2.986;e_Y~N=-(41991/T)+18.83 That on denitriding constants are: 1g K_(CeN)~°=-(20960/T)+7.972;1g K_(YN)=-(20440/T)+7.863 That on standard free energy of formation of CeN and YN are: △G_(CeN)~°=-401204+152.59T(J/mol) △G_(YN)~°=-391246+150.50T(J/mol) That on self-interaction coefficients are: e_(Ce)~(Ce)=-(79.92/T)+0.0167;e_Y~Y=-(64.51/T)+0.0142
