Wetting and agglomeration behavior of inclusion and intragranular ferrite formation kinetics in steel with TiO2 addition according to inclusion engineering

Wangzhong Mu, Changji Xuan, Hiroyuki Shibata, Par Goran Jonsson, Keiji Nakajima

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationAISTech 2017 - Proceedings of the Iron and Steel Technology Conference
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages3027-3036
Number of pages10
ISBN (Electronic)9781935117643
Publication statusPublished - 2017
EventAISTech 2017 Iron and Steel Technology Conference - Nashville, United States
Duration: 2017 May 82017 May 11

Publication series

NameAISTech - Iron and Steel Technology Conference Proceedings
Volume3
ISSN (Print)1551-6997

Conference

ConferenceAISTech 2017 Iron and Steel Technology Conference
Country/TerritoryUnited States
CityNashville
Period17/5/817/5/11

Keywords

  • Agglomeration
  • Confocal laser scanning microscope (CLSM)
  • Inclusion engineering
  • Intragranular ferrite
  • TiO
  • Wetting

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