Inclusion engineering in Manganese-Silicon de-oxidized steel for thin-strip casting
Keywords and Phrases
Ferro-alloy dissolution; Inclusions; Steelmaking; Thermodynamic-modeling; Thin-strip casting
"The focus of this research was to understand inclusion formation and evolution in Mn-Si de-oxidized steels used in thin-strip casting. Inclusions formation and evolution in ultra-low carbon low-alloyed steels were studied. Inclusion engineering can be used to remove or modify detrimental inclusions, which cause casting issues.
The first part of this study focused on inclusion formation as a result of ferro-alloy addition. De-oxidation reaction in steels are the primary source of the typical oxide inclusion formed in steel. For Mn-Si de-oxidized steels ferro-silicon and ferro-manganese are the two ferro-alloys used for de-oxidation. Inclusion formation and evolution during the early stages of dissolution of these ferro-alloys was experimentally studied. The mechanism for inclusion formation in their transient phase was proposed.
The second part of this study shows the results of modification of inclusions observed in Mn-Si killed steel as a result of ferro-titanium addition. MnO-SiO2-Al2O3 based inclusions were modified by ferro-titanium addition to form inclusions of lower melting points. These inclusions would cause fewer issues during casting.
In the third part of this study a comprehensive dynamic model for vacuum tank degasser (VTD) was developed. VTD is used in the industry to obtain ultra-low carbon steels. Further, VTD processing typically removes gaseous species from liquid steel which is essential for thin-strip casting. Inclusion content in the steel is further reduced by this process. The VTD model calculated thermodynamic equilibrium under different conditions within steel in a ladle during VTD processing. The model successfully predicted composition change in steel over time under VTD processing."--Abstract, page iv.
Smith, Jeffrey D.
Robertson, D. G. C.
Lekakh, S. N. (Semen Naumovich)
O'Malley, Ronald J.
Materials Science and Engineering
Ph. D. in Materials Science and Engineering
Missouri University of Science and Technology
Journal article titles appearing in thesis/dissertation
- Transient inclusion formation and evolution in silicon-killed steels
- Inclusion modification in Si-Mn killed steels using titanium addition
- A kinetic model for vacuum tank degassing
xiv, 163 pages
© 2015 Vivek Thapliyal, All rights reserved.
Dissertation - Open Access
Library of Congress Subject Headings
Steel -- Deoxidizing
Degassing of metals
Steel -- Metallurgy
Electronic OCLC #
Link to Catalog Recordhttp://laurel.lso.missouri.edu/record=b10848400~S5
Thapliyal, Vivek, "Inclusion engineering in Mn-Si de-oxidized steel for thin-strip casting" (2015). Doctoral Dissertations. 2397.