Development of a 900F Titanium Alloy.
Abstract
Titanium base alloys containing up to 1%Si were evaluated for long term creep applications at 900F. Silicon additions were found to improve creep strength with the most desirable properties obtained when silicon was added along with another beta stabilizer. The influence of the beta stabilizers molybdenum, iron, vanadium, columbium, manganese, chromium and tungsten were evaluated in silicon-containing alpha-matrix alloys. A major emphasis was placed on molybdenum which was found to be the most favorable element in this group. An optimum addition of 0.5 to 1%Mo was established for alloys containing 0.25 to 0.5%Si. Larger amounts of molybdenum were found to decrease both creep resistance and thermal stability. Thermo-mechanical processing and heat treatment studies were conducted on two compositions, Ti-5Al-5Sn-2Zr-0.8Mo-0.5Si and Ti-5Al-5Sn-2Zr-0.8Mo-0.7Si. The best combination of tensile strength, creep strength and thermal stability was achieved by alpha+beta processing the 0.5%Si alloy followed by annealing at a temperature above the beta transus. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1970
- Accession Number
- AD0872871
Entities
People
- H. B. Bomberger
- P. A. Russo
- S. R. Seagle