In-situ observation of intragranular ferrite nucleation at oxide particles

被引：29

作者：

Hanamura, T

Shibata, H

Waseda, Y

Nakajima, H

Torizuka, S

Takanashi, T

Nagai, K

机构：

[1] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan

[2] Tohoku Univ, Inst Adv Mat Proc, Aoba Ku, Sendai, Miyagi 9808577, Japan

来源：

ISIJ INTERNATIONAL | 1999年 / 39卷 / 11期

关键词：

in-situ observation; austenite-ferrite phase transformation; confocal scanning laser microscope; oxide; MnS; TiN;

D O I：

10.2355/isijinternational.39.1188

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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.

引用

页码：1188 / 1193

页数：6

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