ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
In-situ Observation of Intragranular Ferrite Nucleation at Oxide Particles
Toshihiro HanamuraHiroyuki ShibataYoshio WasedaHiroshi NakajimaShiro TorizukaToshihiko TakanashiKotobu Nagai
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1999 Volume 39 Issue 11 Pages 1188-1193

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Abstract

"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 1010 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.

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© The Iron and Steel Institute of Japan
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