Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Reexamination of the High Temperature Region of Fe-W Binary Alloy Phase Diagram
Eiji ICHISEYoshiyuki UESIIMAShoji MIYAGAWA
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1986 Volume 72 Issue 7 Pages 791-798

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Abstract

High temperature region of Fe-W binary alloy phase diagram was reexamined by ion intensity thermal analysis with a Knudsen cell-mass spectrometer combination and metallographic method. Temperature of two invariant reactions, Fe(α) Fe3W2(ε) and Fe3W2(ε)=L+(W) and composition of the decomposing phases were determined through the arrest temperature and the duration of the arrest appearing on the heating curves of the ion intensity. Identification and composition determination of the equilibrating phases were also carried out by metallographic examination of diffusion couples and heat treated samples.
Obtained results agreed well with some phase diagrams in the literatures. FeW (σ) phase which was claimed to exist in a phase diagram in a literature was not detected in the experimental temperature range. This coincides with the behavior of the activity curves of Fe-W alloys reported by the authors previously.
The results of this study prove the ion intensity thermal analysis to be useful for the study of high temperature transformations including liquid phase.

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© The Iron and Steel Institute of Japan
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