β型チタン合金 Ti-15V-3Cr-3Sn-3Al の加工性および熱処理特性(<特集>チタンおよびチタン合金)

概要

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Ti-15V-3Cr-3Sn-3Al alloy sheets 1.6 to 7 mm thick were produced from a 100 kg ingot to study characteristics of manufacturing workability and heat treatability of the alloy. It was proved that the alloy had higher hot working deformation resistance than Ti-6Al-4V alloy, the most widely used titanium alloy, but was superior in cold rollability and bending workability to Ti-6Al-4V. As the alloy was prone to pick up hydrogen during manufacturing processes, the problem of hydrogen contaminant must be fully considered in the processing. β phase was completely retained throughout the thickness in the plate as thick as 14 mm even by air cooling after solution heating. The growth rate of β grain was comparatively low in the temperature range of 750 to 900℃ tested. After solution treatment and aging, the coarser the β grain was, the lower the ductility became. When aging temperature was lower, precipitated α phase was finer and strength became higher. Tensile strength as high as 150 kg/mm^2 could be attained by a suitable condition of cold rolling and subsequent aging.
社団法人日本鉄鋼協会の論文
1986-04-01