INTERMITTENT CREEP AND STABILITY.
Abstract
The Intermittent Creep and Stability Program consists of measuring the effects of exposure to 550 F and 650 F on candidate materials for a supersonic transport airplane. The variation in exposure includes exposing specimens to steady-state heat without load, steady-state heat plus load, intermittent heat without load, and intermittent heat plus load. Specimens are to be exposed for time span up to 30,000 hours. Following exposure, the unnotched and notched tensile properties will be measured. The fracture toughness parameter Kc will be calculated. A comparison will be made between the influence of intermittent exposure and the influence of steady exposure. The materials under investigation are Ti-8A1-1Mo-1V (duplex annealed) and Ti-6A1-4V (mill annealed) titanium alloys, AM 350 SCT (825 degrees) and PH 14-8 Mo SRH (1050) stainless steels, and Rene' 41 (20 percent cold rolled + 16 hours at 1400F) super alloy. This report covers creep data to 29,000 hours of steady and intermittent creep testing. Creep data for 30-inch gage length specimens of Ti-6A1-4V and Ti-8A1-1Mo-1V titanium subjected to intermittent creep up to 12,800 hours in a General Dynamics corporate sponsored research program, are shown as more precise data in lieu of the 2-inch gage length data. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1966
- Accession Number
- AD0807668
Entities
People
- O. N. Thompson
- R. L. Jones
Organizations
- General Dynamics