β型Ti-15V-3Cr-3Sn-3Alチタン合金の溶接熱影響部の硬度特性に及ぼす時効処理の影響(平成3年度秋季全国大会論文発表講演討論記録)

概要

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Effect of aging treatment on hardening characteristics in HAZ of Ti-15V-3Cr-3Sn-3Al titanium alloy was investigated by means of transmission electron microscopy and X-ray diffraction technique. As the aged Ti-15V-3Cr-3Sn-3Al alloy was welded by using DCRP-TIG welding procedure, the decrease of the hardness occurred in the heat-affected zone, because of the solution of α phase. The hardness in the HAZ was considerably higher than that of the base metal, as the welded sample was aged at 773 K after welding. Maximum hardness after aging treatment increased with increasing solution treatment temperature. The precipitation of α phase occurred, as the specimens were aged at 573,673,773 K after solution treatment. The precipitation amount of α phase increased with increasing solution temperature at any aging temperature. The high solution treatment temperature also caused homogeneous precipitation and fine precipitation of α phase during aging by means of transmission electron microscopy. Consequently, the high hardness was due to the fine precipitation of α phase.
1992-02-05