Manufacturing method thereof having a low Young's modulus of 75GPa and less than + type titanium alloy

摘要

PROBLEM TO BE SOLVED: To provide an α+β type titanium alloy having a low Young's modulus of less than 75 GPa and the method for manufacturing the same.;SOLUTION: The α+β titanium alloy contains, by mass, ≥3.5% and 6.5% of Al, ≥0.6% and 3.1% of Fe, and one or more elements of Cr, V, and Mo such that a Mo equivalent amount defined by a formula: Mo equivalent amount=[% Mo]+2.9×[% Fe]+0.67×[% V]+1.1×[% Ni]+1.6×[% Cr]+1.6×[% Mn]+0.28×[% Nb]-[% Al] becomes 2.0% or more and lower than 8.0%. The average Mo equivalent amount of the alloy components in the β-phase or martensite phase is 3.85% or more and lower than 10.00% and the total area rate of the β-phase or martensite phase in the Mo equivalent area is 55% or more and lower than 99%. After a solution heat treatment, the alloy is cooled at the cooling speed above water-cooling speed from the temperature exceeding β transformation point -100°C and lower than the β transformation point, then cold working is applied.;COPYRIGHT: (C)2013,JPO&INPIT