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Some aspects of inclusion control and behavior with focus on secondary metallurgy
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. , xiv, 43 p.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-96622ISBN: 978-91-7501-223-0 (print)OAI: oai:DiVA.org:kth-96622DiVA: diva2:531489
Public defence
2012-06-13, Sal B1, Brinellvägen 23, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120607Available from: 2012-06-07 Created: 2012-06-07 Last updated: 2012-07-23Bibliographically approved
List of papers
1. Observed behavior of various oxide inclusions in front of a solidifying low-carbon steel shell
Open this publication in new window or tab >>Observed behavior of various oxide inclusions in front of a solidifying low-carbon steel shell
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2010 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 45, no 8, 2157-2164 p.Article in journal (Refereed) Published
Abstract [en]

The engulfment and pushing (extrusion) of inclusions during solidification play an important role in the formation of a steel structure and, as a result, for the mechanical properties of the final steel product. The aim of this study is to gain knowledge about the behavior of non-metallic inclusions at the interface between a growing solid front and a liquid phase. The focus is on the effect of the titanium and titanium oxide content on the inclusions and the different phenomena, which occurs at the solid/liquid interface. This was studied in samples of low-carbon steels de-oxidized by different combinations of Al, Ca, and Ti. For this purpose, each metal sample of 0.19 g was melted at a temperature close to 1550 A degrees C in an argon atmosphere and solidified under different solidification rates. A direct observation of inclusion behavior during solidification was made using a confocal scanning laser microscope equipped with an infrared gold image furnace. The alloying elements in the sample varied between: C 0.002-0.044; Si 0.02-1.33; Mn 0.12-1.33; P 0.003-0.016; S 0.003-0.01; Al 0.002-0,033; Ni 0-0.28; Cr 0-0.25; Ti 0.008-0.065; Ca 0.0007-0.002; O 0.002-0.0114 and N 0.0028-0.0056 (mass%). Several types of inclusions with different morphologies were found within the sample. The morphology of the observed inclusions on the molten steel surface varied from round alumina and calcium-oxide-rich inclusion to needle-shaped titanium oxide-rich inclusions. The observed motions of the inclusions at the vicinity of the front of the solidifying steels were classified. At a low solidifying velocity and a small inclusion size, inclusions flowed away from the solidifying front. Furthermore, they also or got pushed a distance and thereafter flowed away from the interface. At a medium velocity and a slightly bigger size, inclusions tend to get pushed in front of the solidifying front. Another observation was that at a high velocity and a large particle size, inclusions tend to get engulfed or pushed and then engulfed by the progressing front. The relationship among the morphology, chemical composition of inclusions and the solidifying velocity is discussed in this article.

Keyword
NONMETALLIC INCLUSIONS, SOLIDIFICATION FRONT, PUSHING/ENGULFMENT TRANSITION, CRITICAL VELOCITY, INTERFACE, ENGULFMENT, PARTICLES, DYNAMICS, ALLOY
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-28747 (URN)10.1007/s10853-009-3982-x (DOI)000274656400028 ()2-s2.0-77949875016 (Scopus ID)
Note
QC 20110120Available from: 2011-01-20 Created: 2011-01-19 Last updated: 2017-12-11Bibliographically approved
2. Observation of inclusion behavior at a solid/liquid interface in a solidifying low carbon steel
Open this publication in new window or tab >>Observation of inclusion behavior at a solid/liquid interface in a solidifying low carbon steel
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2011 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011
Keyword
non-metallic inclusions, low carbon steel, solid/liquid interface, pushing engulfment, flow
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-99268 (URN)
Note
QC 20120723Available from: 2012-07-23 Created: 2012-07-23 Last updated: 2012-07-23Bibliographically approved
3. High temperature in-situ observations of variour oxide inclusion agglomerations
Open this publication in new window or tab >>High temperature in-situ observations of variour oxide inclusion agglomerations
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2011 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011
Keyword
agglomeration, inclusion, Confocal Scanning Laser Microscope, calium, titanium
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-99271 (URN)
Note
QC 20120723Available from: 2012-07-23 Created: 2012-07-23 Last updated: 2012-07-23Bibliographically approved
4. Optimization of stirring conditions during vaccum degassing in order to lower the inclusion content in tool steel
Open this publication in new window or tab >>Optimization of stirring conditions during vaccum degassing in order to lower the inclusion content in tool steel
2012 (English)In: Iron and Steel makingArticle in journal (Refereed) Submitted
Keyword
tool steel, inclusions, vacuum treatment, gas stirring, induction stirring
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-99272 (URN)
Note
QS 2012Available from: 2012-07-23 Created: 2012-07-23 Last updated: 2012-07-23Bibliographically approved
5. Influence of the final stirring treatment on the inclusion numer in tool steel
Open this publication in new window or tab >>Influence of the final stirring treatment on the inclusion numer in tool steel
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2012 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812Article in journal (Other academic) Submitted
Keyword
tool steel, ladle treatment, induction stirring, gas stirring, inclusiotn
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-99274 (URN)
Note

QS 2012

Available from: 2012-07-23 Created: 2012-07-23 Last updated: 2017-12-07Bibliographically approved

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