RESEARCH AND DEVELOPMENT OF TITANIUM ROCKET MOTOR CASE
Abstract
The sustained notched tensile strength of coldrolled and aged sheet stock at the 180,000 psi yield strength level was lower in the -35 F to 200 F temperature range for a H content of 70 than for 200 ppm; strengths were equivalent at 400 F. Press-forged pancakes with a 0.15%-O content were capable of attaining the 200,000 psi yield strength level by direct aging at 900 F. Multiple-pass tungsten inert gas (TIG) welding produced no improvement in notched tensile strength or toughness as compared with the single-pass method despite reduced grain size and increased bend ductility; electron-beam welding yielded slight improvements as compared with TIG welding. Closed-die press forging of subscale 14-in.-diam domes by the pancake and preform technique at 1650 F and 1700 F produces superior tensile ductility at the 180,000 psi yield strength level as compared with similar forging at 1850 and 2000 F. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1961
- Accession Number
- AD0269679
Entities
People
- R.p. Brody
- W.e. Helfrich