摘要
为扩展镁处理在硅锰脱氧钢体系中的应用,采用高温模拟试验与热力学分析相结合的方法,考察了镁添加量及镁添加顺序对夹杂物生成及演变行为的影响。研究结果表明,Mg-Si-Mn-O钢液体系在1 600℃时存在MgO-SiO_2-MnO(l)、2MgO·SiO_2(s)和MgO(s)3个热力学稳定区域。镁处理可有效改变SiO_2-MnO脱氧产物,低镁加入量(0.000 5%)下生成MgO-SiO_2-MnO液相夹杂物,高镁加入量(0.001 9%)下生成MgO固相夹杂物。硅和镁的加入顺序不同导致夹杂物的生成路径也不相同,先硅后镁时夹杂物生成路径为SiO_2-MnO(l)→MgO-SiO_2-MnO(l),而先镁后硅时夹杂物的演变过程为MgO(s)→MgO-SiO_2(s)→MgO-SiO_2-MnO(l)。
In order to expand the application of magnesium treatment in the Si-Mn killed steel production,the effect of the amount and the order of addition magnesium on the formation and the evolution of inclusion were investigated by the combination of high temperature experiments and thermodynamic calculations.The results showed that the stability diagram of the Mg-Si-Mn-O molten steel at 1 600℃was composed of Mg O-SiO2-MnO(l),2 Mg O·Si O2(s)and the Mg O(s).The deoxidization product of the SiO2-MnO(l)was modified to MgO-SiO2-MnO(l)when the addition amount of magnesium was 0.000 5%.When the addition amount of the magnesium increased to 0.001 9%,Mg O(s)phase formed.The formation path of inclusions varied with different orders of addition magnesium.When magnesium was added following the silicon addition,the formation path was SiO2-MnO(l)→MgO-SiO2-MnO(l).While the evolution path was MgO(s)→MgO-SiO2(s)→MgO-SiO2-MnO(l)when magnesium was added before addition silicon.
作者
张庆松
闵义
许海生
许久健
刘承军
ZHANG Qing-song;MIN Yi;XU Hai-sheng;XU Jiu-jian;LIU Cheng-jun(Key Laboratory for Ecological Metallurgy of Multimetallic Ores(Ministry of Education),Northeastern University,Shenyang 110819,Liaoning,China)
出处
《钢铁》
CAS
CSCD
北大核心
2019年第4期37-42,共6页
Iron and Steel
基金
国家自然科学基金资助项目(51674069
51374060)
国家重点研发计划资助项目(2017YFC0805100)
关键词
镁处理
硅锰脱氧
非金属夹杂物
热力学
magnesium treatment
Si-Mn deoxidization
inclusion
thermodynamics
