heat treatment for improving the properties of alpha beta titanium alloys

摘要

An alpha-beta titanium-base alloy (20) is heat treated to improve its dwell fatigue properties while retaining a good balance of mechanical properties. The heat treatment includes first heating (22) the alpha-beta titanium-base alloy to a first heat-treatment temperature in a first range of from about 70 DEG F below a beta transus temperature of the alpha-beta titanium-base alloy to the beta transus temperature of the alpha-beta titanium-base alloy, and quenching (24) the alpha-beta titanium-base alloy at a rate of greater than about 200 DEG F per minute. The alpha-beta titanium-base alloy is second heated (26) to a second heat-treatment temperature in a second range of from about 100 DEG F to about 400 DEG F below the beta transus temperature of the alpha-beta titanium-base alloy, and thereafter the alpha-beta titanium-base alloy is cooled (28) to ambient temperature at a rate of from about 10 DEG F per minute to about 200 DEG F per minute. IMAGE