铝热还原制备高钛铁脱氧性能的研究  

Research on the Deoxidation Performance of High Titanium Ferro Prepared by Thermite Reaction

作　　者：豆志河[1] 张廷安[1] 牛丽萍[1] 刘燕[1] Dou Zhihe;Zhang Ting’an;Niu Liping;Liu Yan(Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学教育部多金属共生矿生态冶金重点实验室,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2020年第3期862-870,共9页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(U1908225,U1702253);Fundamental Research Funds for the Central Universities(N 182515007,N 170908001,N2025004)。

摘　　要：研究了钢液精炼过程中高铝高钛铁的热力学性能,并研究了高钛铁中铝含量和用量对钢液精炼过程的影响。结果表明:以Ti和Al为复合脱氧剂,当钢液中的aTi/aAl在8以上时,1873 K处的脱氧产物为Ti2O3;而事实上,只有当钢液中的aTi/aAl值在10以上时,Ti2O3才沉淀为脱氧产物。采用高铝含量高钛铁作为脱氧剂时,钢液中铝和钛的含量可满足相关钢的成分要求。随着高钛铁含量的增加,经精炼后的铸钢中的夹杂由硅酸盐转变为Ti-Al-Mn复合夹杂,同时在这些夹杂周围形成明显或部分的径向针状铁素体,细化了钢的显微组织。实际系统中的aTi/aAl值为17.78(>8),与理论结果一致。当钢液含氧量较高时,控制钢液中的aTi/aAl值至关重要。Due to the defects of high aluminum residue and high oxygen residue, high titanium ferro alloy prepared by thermite reaction outside the furnace cannot be directly used in liquid steel refining process. In this paper, thermodynamics of the high titanium ferro with high aluminum used in liquid steel refining process were studied, and then effects of the amount and content of aluminum in high titanium ferro on the liquid steel refining process were also studied. The results indicate that using Ti and Al as composite deoxidizers, the deoxidizing product at 1873 K is Ti2O3 when the aTi/aAl in liquid steel is above 8;in fact, however, only when the aTi/aAl value in liquid steel is above 10, Ti2O3 precipitates as deoxidizing product. Using high titanium ferro with high aluminum content as deoxidizer, the content of aluminum and titanium in liquid steel can meet the requirements of composition for the related steel. With the increasing amount of high titanium ferro, inclusions in cast steel after refining transform from silicate into Ti-Al-Mn composite inclusions;at the same time, obvious or part of radial acicular ferrite forms around those inclusions, which refines the microstructure of steel. The aTi/aAl value in the actual system is 17.78(>8), which is consistent with the theoretical results. It is vital to control the values of aTi/aAl in the liquid steel when the oxygen content in liquid steel is high.

关 键 词：钢液脱氧 夹杂物 铝热反应 氧化物冶金 

分 类 号：TF769[冶金工程—钢铁冶金]