In-situ observation of intragranular ferrite nucleation at oxide particles

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

doi:10.2355/isijinternational.39.1188

In-situ observation of intragranular ferrite nucleation at oxide particles

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

Division of Process and System Engineering

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

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 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 language	English
Pages (from-to)	1188-1193
Number of pages	6
Journal	Isij International
Volume	39
Issue number	11
DOIs	https://doi.org/10.2355/isijinternational.39.1188
Publication status	Published - 1999

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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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 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.",

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AU - Hanamura, Toshihiro

AU - Shibata, Hiroyuki

AU - Waseda, Yoshio

AU - Nakajima, Hiroshi

AU - Torizuka, Shiro

AU - Takanashi, Toshihiko

AU - Nagai, Kotobu

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AB - `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.

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