钛合金化对铝镇静钢中夹杂物的影响  

Effect of Ti-Alloyed on Inclusions in Al-Killed Steel

作　　者：李朋欢[1,2] 叶健松[1] 胡文豪[1] 包燕平[3] 

机构地区：[1]杭州钢铁集团公司,浙江杭州310022 [2]浙江大学材料科学与工程学系,浙江杭州310027 [3]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁研究学报》2013年第10期20-24,共5页Journal of Iron and Steel Research

摘　　要：对于钛合金化铝镇静钢,热力学计算结果显示,稳定的脱氧产物为Al2O3,Al2TiO5只有在钢中铝的质量分数低于0.008%后才会形成。通过对Ti-IF钢实际冶炼过程中的取样分析发现:加入钛铁后,钢中会出现不稳定的Al-Ti复合氧化物,可能是钛铁中的钛氧化物与钢中铝逐渐反应而形成的产物;浇铸过程中,中间包覆盖剂中SiO2等可还原性氧化物含量比较高时,在钢-渣界面处铝的损失非常严重,因此在靠近钢液侧就会产生局部富钛区域,从而满足生成Al2TiO5或者Ti3O5的热力学条件,在湍流运动的条件下,生成的钛氧化物很容易被卷入钢液内部。Thermodynamics calculation indicates that the stable inclusion is Al2O3 for Ti-alloyed Al-killed steel. And only when A1 content is below 0. 008 % does Al2 TiO5 emerge. Systematical samples from practical production of Ti-IF steel reveals following discoveries. Unstable A1 Ti composite oxides formed in steel possibly due to the re- action between titanium oxides in ferrotitanium and aluminum in steel During casting process, the aluminum loss near the melt/slag interface is more sever if the content of reducible oxide such as SiO2 is higher in tundish flux. Therefore Ti enrichment happens in partial areas near the melt and thermodynamic conditions for generating Al2TiO5 or Ti3 O5 could be satisfied. In addition, titanium oxides can be easily transported into steel melt by tur- bulent flow.

关 键 词：夹杂物 钛氧化物 热力学 

分 类 号：TG142.13[一般工业技术—材料科学与工程]