amp;alpha;+amp;beta; TYPE TITANIUM ALLOY MEMBER HAVING HIGH STRENGTH AND LOW YOUNG'S MODULUS, AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an α+β type titanium alloy member having both low Young's modulus and high strength, and to provide a method for producing the same.;SOLUTION: The high strength α+β type titanium alloy member having a Young's modulus of 70 to less than 100 GPa contains 4.4% to less than 5.5% Al, 1.4% to less than 2.1% Fe, less than 2.5% Cr, less than 5.0% V, less than 0.1% Si, and less than 0.01% C, wherein the sum of Cr and V is 1.0% to less than 5.0%, and the balance is Ti and inevitable impurities. Further, the member contains Mo instead of V in an amount of less than 3.5%, wherein the sum of Cr and Mo is 1.0% to less than 5.0%. Alternatively, the member further contains Zr in an amount of 0.5% to less than 3.5%. The method for producing the member includes cooling the titanium alloy having the above composition from a temperature of exceeding 850°C and 950°C or less at a cooling rate of water cooling or more.;COPYRIGHT: (C)2012,JPO&INPIT