Metallurgical Study of Criteria Used to Achieve Compression of Elevated Temperature Test Time
Abstract
This investigation was performed to study the validity of certain criteria used to achieve compression of test time of elevated temperature creep tests. The hypothesis that accumulation of a constant strain under various stresses at a constant temperature results in equivalent damage was evaluated from residual strength level as well as microstructural behavior. Materials selected for this evaluation were Ti-8Al-1Mo-1V in the duplex-annealed condition, Ti-6Al-4V in the annealed condition, and aluminum alloy 2024-T3. Materials were chosen as representative of high strength titanium alloys and aluminum alloys having good elevated-temperature strength. The titanium alloys were creep strained to 1% total strain using three different creep stresses at 800F; the aluminum alloy was investigated using a similar approach at 300F. Detailed microscopic studies were performed to study microstructural changes in terms of the creep rate. Residual strength was correlated with microstructure to determine the validity of the 'equivalent damage' approach to test time compression.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1970
- Accession Number
- AD0868342
Entities
People
- Robert E. Herfert