1873K下钢液中Ti-Al复合脱氧热力学分析及夹杂物生成  

Deoxidization thermodynamics of Ti-Al systems in molten steel at 1873K and precipitation of inclusions

作　　者：杨成威[1] 吕迺冰[1] 王新华[1] 王万军[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《北京科技大学学报》2009年第11期1390-1393,共4页Journal of University of Science and Technology Beijing

摘　　要：对1873K下钢液中Ti-Al-O系复合夹杂物的形成进行了理论和实验研究.理论计算和实验结果表明,钢液中Ti-Al-O系的Al-O基本趋于平衡,钢液中自由氧由Al含量控制.Ti-Al-O系复合夹杂物的形成主要由aTi/aAl值确定.根据热力学数据计算得出了Ti-Al-O系复合夹杂物(Al2O3-Ti3O5-Ti2O3)的稳定区域;随着aTi/aAl的增加,夹杂物逐步由Al2O3转变为Ti3O5夹杂物.当钢液中自由氧含量较高时容易生成Ti3O5夹杂物.计算结果和观察到的实验结果一致.The thermodynamic analysis and experiments of inclusions formation in a Ti-Al-O system in molten steel at 1 873 K were investigated. The results show that in the Ti-Al-O system the equilibrium between Al and O can be obtained instantly and the content of [O] is determined by the amount of Al. The formation of composite inclusions in the Ti-Al-O system depends on aTi/aAl values. According to thermodynamic data, the stable section in the phase diagram of composite inclusions （Al2O3-Ti3O5-Ti2O3） in the Ti-Al-O system was calculated. The composition of inclusions changes from Al2O3 to Ti3O5 as the aTi/aAl value increases. When the molten steel contains high amount of [O], it is very easy to form Ti3O5 inclusions. The experimental results agree well with thermodynamic data.

关 键 词：复合夹杂物 氧化物冶金 析出 热力学 

分 类 号：TF701.2[冶金工程—钢铁冶金]