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 contribution

    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 Jan 1
    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

    Other

    OtherAISTech 2017 Iron and Steel Technology Conference
    CountryUnited States
    CityNashville
    Period17/5/817/5/11

    Keywords

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

    ASJC Scopus subject areas

    • Industrial and Manufacturing Engineering

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  • Cite this

    Mu, W., Xuan, C., Shibata, H., Jonsson, P. G., & Nakajima, K. (2017). Wetting and agglomeration behavior of inclusion and intragranular ferrite formation kinetics in steel with TiO2 addition according to inclusion engineering. In AISTech 2017 - Proceedings of the Iron and Steel Technology Conference (pp. 3027-3036). (AISTech - Iron and Steel Technology Conference Proceedings; Vol. 3). Association for Iron and Steel Technology, AISTECH.