镁处理低碳钢中MgAl2O4夹杂物的聚集行为  

Aggregation behavior of MgAlO inclusions in magnesium-treated low carbon steel

作　　者：曹磊 金朋亮 肖远悠 尚德礼 刘春伟 王国承[1] CAO Lei;JIN Peng-liang;XIAO Yuan-you;SHANG De-li;LIU Chun-wei;WANG Guo-cheng(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;State Key Laboratory of Metal Materials and Applications of Marine Equipment for Ansteel,Anshan 114021,Liaoning,China;Laiwu Company,Shandong Iron and Steel Company Ltd.,Laiwu 271100,Shandong,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]鞍钢海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114021 [3]山东钢铁股份有限公司莱钢分公司,山东莱芜271100

出　　处：《钢铁》2020年第11期37-46,共10页Iron and Steel

基　　金：国家自然科学基金资助项目(51874170)。

摘　　要：为了研究MgAl2O4夹杂物的聚集行为,通过金相试样法和有机溶液电解分离法结合场发射扫描电子显微镜对镁处理铝脱氧低碳钢中单颗MgAl2O4夹杂物、多粒子MgAl2O4夹杂物进行观察。热力学计算结果表明,MgAl2O4夹杂物在液相中析出。FactSage计算得到钢中夹杂物相变规律,夹杂物预测种类与试验观察结果一致。对多粒子MgAl2O4夹杂物进行分析,发现腔桥力远远大于毛细管作用力、范德瓦尔斯力、黏滞力。因此,腔桥力是诱导MgAl2O4夹杂物发生聚集的主要作用力。钢液条件为温度升高、低aO(氧活度)、低w([S])时,腔桥力数值较小,引起MgAl2O4夹杂物的聚集能力最弱。In order to study the aggregation behavior of MgAl2O4 inclusions,single MgAl2O4 inclusions,and multiparticle MgAl2O4 inclusions in magnesium-treated aluminum deoxidized low carbon steel were observed by metallographic sample method and organic solution electrolytic separation method combined with field emission scanning electron microscope.Thermodynamic calculation results indicate that MgAl2O4 inclusions are precipitated in the liquid phase.The phase transformation law of inclusions in steel was calculated by FactSage,and the predicted types of inclusions were consistent with the experimental observations.The analysis of the multi-particle MgAl2O4 inclusions shows that the cavity bridge force is much greater than the capillary force,van der Waals force,and viscous force.Therefore,the cavity bridge force is the main force that causes the aggregation of MgAl2O4 inclusions.When the molten steel condition is that increasing temperature,lowaO(oxygen activity),and low w([S]),the cavity bridge force value is small,which causes the weakest aggregation ability of MgAl2O4 inclusions.

关 键 词：镁处理 低碳钢 夹杂物 热力学 聚集行为 

分 类 号：TF703[冶金工程—钢铁冶金]