Author/Authors :
Nagasaka، نويسنده , , Takuya and Muroga، نويسنده , , Takeo and Hino، نويسنده , , Takeshi and Satou، نويسنده , , Manabu and Abe، نويسنده , , Katsunori and Chuto، نويسنده , , Toshinori and Iikubo، نويسنده , , Tomohito، نويسنده ,
Abstract :
An alloy of V–4Cr–4Ti–0.15Y was fabricated by 15 kg-scale magnetic levitation melting. The oxygen level was successfully reduced to 108 wppm by slag-out of Y2O3 formation on the surface of the melted ingot. Y2O3 was identified as a new type of precipitate, in addition to Ti–O type and Ti–N type precipitates common in V–4Cr–4Ti alloys. Y2O3 formation is thought to reduce the amount of oxygen in solid solution state and in unstable Ti–O type precipitates. Based on the behavior of the O impurity, optimum fabrication processes for V–4Cr–4Ti–0.15Y alloy were suggested.
