It has been suggested that Ti-containing inclusions could cause
clogging of the submerged entry nozzle, decrease continuous casting
productivity, and is a source of surface defects on the steel
products. It is the aim of this project to investigate whether the
existence of Ti-containing inclusions can be the results of
transient conditions, which can be caused by (i) local and
temporary variation of the Ti/Al, (ii) fluctuations in melt
temperature and (iii) changes in O availability. The approach
undertaken in this study is to simulate transient conditions for
the Fe-Al-Ti-O melts and sample the melts as a function of time
during a time period that is of relevance to industrial ladle
processing. The samples are characterized for inclusion shape, size
and chemistry through scanning electron microscopy (SEM), inclusion
structure and detailed chemistry through transmission electron
microscopy (TEM) and chemical analysis. The influences of the
following variables on the inclusion characteristics have been
investigated: 1) Ti source, 2) Ti vs. Al ratio, 3) temperature and
4) time between Al and Ti additions. The starting O content was in
all cases in the range between 330-460 ppm.
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