摘要 对首钢京唐生产IF钢的同一浇次前2炉的RH精炼、镇静和中间包浇铸过程进行了系统取样，并利用Aspex自动扫描电子显微镜分析统计了钢中夹杂物的成分、尺寸等信息.研究发现，Al2O3-Ti○xO复合夹杂物在Ti合金化和二次氧化的情况下都会生成，并随着精炼的进行逐渐转变为Al2O3，这与热力学计算的结果一致；而Al2O3可以作为Al2O3-Ti○xO的形核核心，形成Al2O3-Ti○xO包裹Al2O3的夹杂物，并且在Al2O3-Ti○xO转变为Al2O3的过程中会导致钢滴进入夹杂物内部，从而形成Al2O3包裹钢滴的夹杂物.Abstract：The transition of non-metallic inclusions of IF steel produced by SGJT during RH refining and tundish was investigated. Molten steel samples were taken from 2 industrial heats systematically， and the compositions， size distribution and number of the inclusions were analyzed using Aspex scanning electron microscopy. The results showed that Ti alloying and reoxidation of molten steel results in the formation of Al2O3-Ti○xO inclusions， then these inclusions are transformed into Al2O3 inclusions during RH refining， which is in agreement with thermodynamic calculation. In addition， Al2O3 inclusions could be the nucleus of Al2O3-Ti○xO that wraps up them， and steel droplets outside enters into the interior of the inclusions in the transformation from Al2O3-Ti○xO to Al2O3， so steel droplets exists in the interior of Al2O3 inclusions.
References
[1]
Doo W C，Kim D Y，Kang S C，et al.The morphology of Al-Ti-O complex oxide inclusions formed in an ultra low-carbon steel melt during the RH process［J］.Metals and Materials International，2007，13(3):249-255.
[2]
Basu S，Choudhary S K，Girase N U.Nozzle clogging behaviour of Ti-bearing Al-killed ultra low carbon steel［J］.ISIJ International，2004，44(10):1653-1660.
[3]
Wang C，Thomas N N，Seetharaman S.Transient behavior of inclusion chemistry，shape，and structure in Fe-Al-Ti-O melts:effect of gradual increase in Ti［J］.Metallurgical and Materials Transactions B，2010，41(5):1084-1094.
[4]
Pak J J，Jo J O，Kim S I，et al.Thermodynamics of titanium and oxygen dissolved in liquid iron equilibrated with titanium oxides［J］.ISIJ International，2007，47(1):16-24
[5]
Jung I H，Eriksson G ，Wu P，et al.Thermodynamic modeling of the Al2O3-Ti2O3-TiO2 system and its applications to the Fe-Al-Ti-O inclusion diagram［J］.ISIJ International，2009，44(10):1290-1297.
[6]
Matsuura H，Wang C，Wen G H，et al.The transient stages of inclusion evolution during Al and/or Ti additions to molten iron［J］.ISIJ International，2007，47(9):1265-1274.
[7]
Park D C，Jung I H，Rhee P C H，et al.Reoxidation of Al-Ti cntaining seels by CaO-Al2O3-MgO-SiO2 slag［J］.ISIJ International，2004，44(10):1669-1678.
[8]
Fabienne R M，Lehmann J，Gaye H.Thermodynamic analysis of inclusions in Ti-deoxidised steels［J］.Scandinavian Journal of Metallurgy，2000，29(5):206-212.
