Standardization of Ti-6Al-4V Processing Conditions.
Abstract
The effects of microstructure, composition, and crystallographic texture on the mechanical, fracture, and fatigue properties of Ti-6Al-4V sheet and plate were evaluated. This program was directed toward defining the processing approach for both product forms that provides the best damage-tolerance characteristics for fracture-critical applications. Specifications were written for premium-grade damage-tolerant Ti-6Al-4V sheet and plate defining processing, and mechanical, and fracture property requirements. The sheet and plate material was produced in accordance with the proposed specifications and characterized. Tensile, fracture toughness, stress-corrosion resistance, fatigue, and fatigue crack propagation (air and salt water) properties were generated. Testing variables incorporated in the fatigue tests included R ratio (0.05, 0.5, and -1), and test orientation (L-T and T-L). Variables in fatigue crack propagation tests included environment (air and salt water), R ratio (0.05 and 0.5), and frequency (6 and 60 cpm). Material and heat treatment (microstructural) variables included variations in oxygen content, crystallographic texture, mill annealing (covering the extremes in time and temperature ranges allowed per MIL-H-81200), duplex-annealing (with air cooling and furnace cooling), and beta-annealing. The results of the tests are presented in tabular and graphical form, for individual specimens and specimen groups. Comparisons to mill-annealed and recrystallization-annealed material are made. The effects of the various material and test variables on the pertinent properties are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1978
- Accession Number
- ADA071542
Entities
People
- R. Bajoraitis
- R. R. Boyer
Organizations
- Boeing Commercial Airplanes