鉄-タングステン二元合金状態図の高温部分の再検討

概要

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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)=L+Fe_3W_2(ε) and Fe_3W_2(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.
社団法人日本鉄鋼協会の論文
1986-05-01