摘要
为了研究中间包二次氧化对IF钢洁净度的影响,针对中间包连铸过程不同时刻IF钢钢液成分和夹杂物的性质进行系统的检测分析,结合热力学计算,揭示IF钢二次氧化过程中夹杂物的演变机理。发现开浇过程中的二次氧化主要是由于吸收空气造成的,使得夹杂物中的Al2O3夹杂物质量分数增加。这些增加的Al2O3一部分是均质形核导致钢中生成了更多小尺寸的Al2O3夹杂物;另一部分是非均质形核导致原来的Al2O3-TiOx复合夹杂物表面形成了一层纯的Al2O3层,同时使得夹杂物尺寸变大。
In the current study,the composition of IF molten steel and the properties of inclusions at different time in tundish during the continuous casting process were systematically analyzed to reveal the effect of tundish reoxidation on cleanliness of IF steels.The evolution mechanism of inclusions during the reoxidation of IF steels was aslo predicted by thermodynamic calculation.It was found that the reoxidation during the casting process was mainly caused by the absorption of air,increasing the Al2O3 content in inclusions.One part of alumina inclusions are formed by homogeneous nucleation,which results in the formation of more small Al2O3 inclusions in steels.The other part is of alumina inclusions are formed by heterogeneous nucleation,which results in the formation of a pure Al2O3 layer on the surface of the original Al2O3 core,and increase the size of the inclusions.
作者
朱坦华
周秋月
任英
段豪剑
张立峰
ZHU Tan-hua;ZHOU Qiu-yue;REN Ying;DUAN Hao-jian;ZHANG Li-feng(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;HBIS Handan Iron and Steel Group Co.,Ltd.,Hadan 056015,Hebei,China;State Key Lab of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2020年第3期35-39,49,共6页
Iron and Steel
基金
国家自然科学基金资助项目(51874032,51704018)
中央高校基本科研业务费专项资金资助项目(FRF-TP-17-001C2,FRF-TP-17-039A1)。
作者简介
朱坦华(1971-),男,硕士,教授级高级工程师,E-mail:zhutanhua@hbisco.com;通讯作者:张立峰(1972-),男,博士,教授,E-mail:zhanglifeng@ysu.edu.cn。
