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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 18b
SUMMARY:Characterization of non-metallic inclusions in Fe-1.5%Al-x%Si (x=0.5-3.0) steel melts
DESCRIPTION:The demands for the cleanliness of steel melts are increasing to improve the mechanical and physical properties of high Si & Al alloyed steels. In the present study, the effect of Si content of steel melts containing 1.5% Al as well as the addition sequence of Si and Al alloy on the characterization of non-metallic inclusions have been investigated. When Si (0.5-3.0%) was added to the melts at 1600°C, SiO2 inclusions were primarily formed and thereafter the area fraction of the inclusions decreased over time. Then, the addition of 1.5% Al to the steel melts containing 0.5-1.0% Si resulted in the formation of Al2O3 clusters due to the high driving force of the Al deoxidation, which is in consistent with the population density function (PDF) analysis with a lognormal distribution. On the other hand, singular type of Al2O3 inclusions were formed when 1.5% Al was added to the 3.0% Si melt because the driving force of the Al deoxidation was relatively low compared to that of Si deoxidation. The PDF analysis for the 3%Si-1.5%Al system showed a fractal distribution, which means that the inclusions are grown by collision mechanism. Alternatively, when 1.5% Al was preferentially added to steel melt, cluster-type Al2O3 inclusions were formed by the strong driving force of the Al deoxidation. The number of cluster-type Al2O3 inclusions decreased over time. When 3.0% Si was subsequently added to the 1.5%Al melt, the singular Al2O3 particles were mainly observed in the steel. Because the addition of Al results in the formation of Al2O3 inclusions in the melts regardless of the alloying sequence and Si content, it is important to float up and to separate the cluster-type Al2O3 inclusions to improve the cleanliness of the high Si & Al alloyed steels.
CLASS:PUBLIC
DTSTART:20230614T145000
DTEND:20230614T151000
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