ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Precipitation Behavior of Fe-Al-O Inclusions under Unidirectional Solidification of Fe-30mass%Ni Alloys Saturated with CaO-Al2O3 Slags
Yoshio KawashitaHideaki Suito
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1995 Volume 35 Issue 12 Pages 1459-1467

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Abstract

The inclusions composition, size, morphology and distribution in an Fe-30mass%Ni alloy were studied as a function of the initial solute contents, which were controlled by the CaO-Al2O3 slags, and of the solidification parameters. The Al2O3-rich Al2O3-CaO inclusions were observed at the initial contents of Al=300-400 and O<6, while the FeO and the FeO-rich FeO-Al2O3 inclusions were observed at the initial contents of Al=2-6 and O=20-130 on mass ppm base. The FeO-rich FeO-Al2O3 inclusions were located in later stage of solidification in the intercellular or the interdendritic region. And most of the Al2O3-rich Al2O3-CaO inclusions were located in later stage of solidification, but some distributed in the intercellular or the interdendritic region. The dependence of the composition and the size of these inclusions on the cooling rate was not observed. The precipitation of FeO and Al2O3 was discussed by using the solute segregation models.

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