High Strength Titanium Alloy VST3553 for Aerospace Fastener Application

The new near-beta titanium alloy VST3553 (Ti-3Al-5V-5Mo-3Cr) has a high degree of processibility which allows to manufacture aerospace fasteners both in hot and cold condition. At that, the deformation rate in cold condition can reach up to 75%. The following level of properties can be achieved after thermomechanical processing of VST3553 alloy: ultimate tensile strength in the range from 970 to 1715 MPa at relative elongation rate from 18 to 4% depending on the heat treatment regime. The manufacturing process for round bars in VST3553 alloy is developed; research carried out on metal structure and mechanical properties after heat treatment.