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The effect of ladle vacuum treatment on inclusion characteristics for tool steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , viii, 13 p.
Keyword [en]
Materials science, oxygen activity, inclusion characteristics, vacuum degassing, desulphurizatin, slag, ladle
Keyword [sv]
Materialvetenskap
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-317ISBN: 91-7178-096-3 (print)OAI: oai:DiVA.org:kth-317DiVA: diva2:8937
Presentation
2005-06-15, B2, Brinellvägen 23, Stockholm, 10:15
Supervisors
Note
QC 20101221Available from: 2005-07-19 Created: 2005-07-19 Last updated: 2010-12-21Bibliographically approved
List of papers
1. Effect of top slag composition on inclusion characteristics during vacuum degassing of tool steel
Open this publication in new window or tab >>Effect of top slag composition on inclusion characteristics during vacuum degassing of tool steel
2007 (English)In: Steel Research International, ISSN 1611-3683, Vol. 78, no 7, 522-530 p.Article in journal (Refereed) Published
Abstract [en]

The focus of the study was to investigate the effect of the chemical composition of the top slag on the inclusion chemical composition during vacuum treatment of a plastic mould tool steel. Sampling was done before and after vacuum degassing. The chemical composition of the inclusions was determined by using SEM combined with EDX. The results showed that several inclusion compositions were found before vacuum degassing, while only one main composition of inclusions was present after vacuum degassing. Furthermore, the composition of the top slag was found to have a great influence on the composition of the inclusions found in samples taken after vacuum degassing. The present study also shows that the vacuum degassing effectively reduces the number of inclusions in steel. Finally, the thermodynamic calculations of the activities using Wagner's equation were found to predict a lower oxygen activity value than the calculations made using the Thermo-Calc software.

Keyword
inclusions, vacuum degassing, ladle, steel, slag, composition
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-16849 (URN)000248554300002 ()2-s2.0-34547700322 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-05-23Bibliographically approved
2. Change of inclusion characteristics during vacuum degassing of tool steel
Open this publication in new window or tab >>Change of inclusion characteristics during vacuum degassing of tool steel
2006 (English)In: Steel Research International, ISSN 1611-3683, Vol. 77, no 6, 392-400 p.Article in journal (Refereed) Published
Abstract [en]

The inclusion characteristics were studied during vacuum degassing by interrupting the operation at five different times after the start of operation. Slag and steel samples were collected and thereafter assessed with respect to steel and slag composition, total oxygen content, size distribution of inclusions and chemical composition of inclusions. The main conclusion is that the number of inclusions in the different size classes as well as the total oxygen content seem to reach a minimum value after around ten minutes of vacuum degassing. Furthermore, it seems to be a consistent trend that, during vacuum degassing, the top slag influences the inclusion composition.

Keyword
inclusions, vacuum degassing, ladle, steel, ladle treatment, mass-transfer, interface
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-15832 (URN)000238898200003 ()2-s2.0-33745627756 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-05-23Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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