| 摘要 |
PROBLEM TO BE SOLVED: To provide an alpha plus beta titanium alloy bar and wire rod which are produced by means of a refining - rolling process and have a structural form composed essentially of equiaxedα-grains and equiaxedβ-grains and in which the average grain size of the equiaxedα-grains and that of the equiaxedβ-grains are regulated to <=1μm, respectively. SOLUTION: The bar and wire rod have aβ-transformation point temp. (Tβ) of 860 to 920 deg.C and also have a composition consisting of, by weight, 3-5% Al, <=0.2% O, <=0.1% N, <=0.1% C, 2-7% V, 1.0-3.5%, in total, of one or >=2 elements selected from the group consisting of Nb, Mo, and W, 0.5-3.0%, in total, of one or >=2 elements selected from the group consisting of Cr, Mn, Fe, Co, and Ni, and the balance Ti with inevitable impurities. Moreover, the bar and wire rod have a structural form composed essentially of equiaxedα-grains and euiaxedβ-transformed structures, and the equiaxedα-grains and the equiaxedβ-transformed structures are superfine grains having <=1μm average grain size, respectively.
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