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Wetting and agglomeration behavior of inclusion and intragranular ferrite formation kinetics in steel with TiO2 addition according to inclusion engineering
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. McMaster University, Canada.ORCID iD: 0000-0003-0533-6729
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Uddeholms AB, Sweden.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2017 (English)In: AISTech - Iron and Steel Technology Conference Proceedings, Association for Iron and Steel Technology, AISTECH , 2017, Vol. 3, p. 3027-3036Conference paper (Refereed)
Abstract [en]

The comprehensive study of inclusion and microstructure characteristics in steel with TiO2 addition has been presented in this work, including wetting behavior between TiO2 and pure Fe, evaluation of inclusion agglomeration tendency, effective nuclei inclusion identification and in-situ observation of intragranular ferrite (IGF) formation. The obtained results show that TiO2 is an effective additive because it is strong wetting with liquid iron and has obvious dispersion potency. Thereafter, the effective nuclei inclusion to induce IGF formation in steel with TiO2 addition is characterized as Ti3O5 phase. The kinetic study of IGF formation using high temperature confocal laser scanning microscope shows that the fraction of IGF increases as the cooling rate increases from 3.6 to 70 °C/min and with increasing prior austenite grain size. Furthermore, it is noted that IGF morphology is refined and the onset temperatures of IGF and GBF decrease with increasing cooling rate. Finally, the onset temperature of GBF formation is higher for the steel containing a smaller grain size, however, the onset temperature of IGF formation is independent of the grain size. This work aims to give a better control of the inclusion modification as well as improving the steel quality in secondary refining and casting process, according to the concept of inclusion engineering.

Place, publisher, year, edition, pages
Association for Iron and Steel Technology, AISTECH , 2017. Vol. 3, p. 3027-3036
Keyword [en]
Agglomeration, Confocal laser scanning microscope (CLSM), Inclusion engineering, Intragranular ferrite, TiO2, Wetting
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-212023Scopus ID: 2-s2.0-85024497959ISBN: 9781935117643 OAI: oai:DiVA.org:kth-212023DiVA, id: diva2:1133319
Conference
AISTech 2017 Iron and Steel Technology Conference, Nashville, United States, 8 May 2017 through 11 May 2017
Note

QC 20170815

Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2017-08-15Bibliographically approved

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Citation style
  • apa
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