| 摘要 |
PURPOSE:To manufacture a Ti-alloy cold-rolled material having superior yield strength and free from anisotropy in yield strength by subjecting a Ti-Al-V alloy to hot working, to cold working in the above state or after going through the stage of annealing treatment, and further to ageing treatment under specific conditions. CONSTITUTION:The hot-rolled stock of (alpha+beta)-type Ti alloy having a composition consisting of, by weight, 2.5-3.5% Al, 2.0-3.0% V, and the balance Ti is cold-worked at <=85% cold draft in the above state or after annealing treatment. Succeedingly, the above material is subjected to strain ageing treatment at 140-300 deg.C in the range represented by an inequality 4R+T>=480 [where R is cold draft (%) and T is ageing temp. ( deg.C)] for >=1hr. In this way, the Ti-alloy cold-rolled material free from anisotropy in yield strength and having >=85kgf/mm<2> yield strength is manufactured.
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