Ti-5553 Wrought Processing and Heat Treatment Optimization

The Ti-5Al-5V-5Mo-3Cr alloy offers a potential solution to thermomechanical processing challenges commonly associated with many commercially available beta and near-beta titanium alloys. Wrought process and heat treatment capabilities of the Ti-5553 alloy were investigated.  Forge processes and heat treatment conditions producing either high strength and moderate tensile ductility or moderate strength and high fracture toughness were identified and further refined. Those processes yielding an optimal balance of strength, ductility, and fracture toughness were selected for use on full-scale wrought thick-section Ti-5553 alloy components.  Beta and alpha-beta forging combined with standard or slow-cooling heat treatment of thick-section components will be reviewed and resulting mechanical properties will be presented.