Thermodynamics of Ti in liquid steels and slags

Thermodynamics of Ti in liquid steels and slags was studied in order to establish a data base for the prediction of TiO_x and TiN formation in liquid steels.The interaction parameters between Ti and i(i = Cr,Ti,Al, Si,Ni,Mo,Nb,N,O) in liquid iron and the equilibrium constants for the formation of TiN and TiO_x in liquid iron were determined as a function of temperature.In view of high Ti yield during ladle treatment,thermodynamics of titanium oxides in ladle slags was studied as well.Activity coefficient and redox equilibrium of TiO_x in MgO saturated CaO-Al_2O_3 slag are also discussed by measuring the distribution ratio of Ti between slag and iron melts and the Ti^(3+)/Ti^(4+) ratio in slag at 1 873 K.

高Mn—Al合金钢液中AIN形成热力学

在1823-1873K温度范围内，用金属一氮化物一气体平衡技术，测定了22mass％Mn铁液中A1N的溶度积。在铁液中，由于Mn对N溶解度的影响，大大地增加了A1N的溶度积。使用Wagner模型，对试验结果进行热力学分析，确定了高Mn—AI舍金钢液中Mn和Al之间的相互作用参数。在1823-1873K，当Mn≤22mass％、Al≤1．8mass％时，eMnAJ=O,rMnAJ=O。