Part null mass of die titanium alloy and die titanium

摘要

PROBLEM TO BE SOLVED: To provide a β type titanium alloy having high strength, requires no expensive additional elements, thus, low in cost, but enabling easy mass-production of a component, and to provide a method of producing a component having high strength using the alloy as the material.;SOLUTION: The β type titanium alloy has an alloy composition comprising, by mass, 10 to 20% Cr and ≤5% Fe, and the balance Ti with inevitable impurities. Further, either or both of ≤7% Ni and ≤6% Al can be incorporated therein. In one method for producing the component, the β type titanium alloy is forged or rolled at β transus or higher and also at ≤1,100°C into a component, and the component is successively subjected to solution heat treatment to recrystallize crystal grains. Preferably, aging treatment is further performed. In an another method, the β type titanium alloy is cold-worked successively to the forging or rolling so as to be a component. Preferably, solution heat treatment is performed prior to the cold working. Further, aging treatment is preferably performed after the cold working.;COPYRIGHT: (C)2005,JPO&NCIPI