In-situ observation of intragranular ferrite nucleation at oxide particles

Toshihiro Hanamura, Hiroyuki Shibata, Yoshio Waseda, Hiroshi Nakajima, Shiro Torizuka, Toshihiko Takanashi, Kotobu Nagai

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


`In-situ' real time observation of the ferrite nucleation at nonmetallic inclusions has been successfully made at elevated temperatures with a confocal scanning laser microscope. The nucleation site, nucleation temperature, and/morphological change of the precipitates and ferrite can be sequentially determined as the phenomena occurring on the surface of steel. A polygonal ferrite starts to precipitate at an oxide particle at 1 010 K and a Widmanstatten ferrite starts to precipitate at a MnS particle at 967 K. The degree of super cooling for austenite-ferrite transformation is found to be in good agreement with the prediction by a thermodynamic calculation.

Original languageEnglish
Pages (from-to)1188-1193
Number of pages6
JournalISIJ International
Issue number11
Publication statusPublished - 1999


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