SECOND PROGRESS REPORT TO MATERIALS LABORATORY WRIGHT AIR DEVELOPMENT CENTER ON EFFECT OF PRIOR CREEP ON MECHANICAL PROPERTIES OF AIRCRAFT STRUCTURAL MATERIALS. Period covered: July 1, 1959 to September 30, 1959
Technical Report
·
OSTI ID:4157528
Specimens of Rene 41 alloy were solution-treated for 1/2 hr at 1950 deg F and aged 16 hrs at 1400 deg F. Tensile tests were run at room temperature and several elevated temperatures to establish base properties. In tests it was found that exposure without stress for 10 hrs at 1400 and 1600 deg F caused slight shrinkage in this alloy while sirnilar exposure at 1800 deg F caused expansion. Other effects of stressed exposures are discussed. ln preparation for creep damage studies on Chromel A alloy, final annealing conditions were determined to be four hours at 1550 deg F for production of fine grained material and one hour at 2100 deg F to produce coarse-grained material. Creep-rupture tests were initiated on the annealed material at temperatures between 1000 and 1800 deg F. Creep exposure tests of Chromel A large grain material indicated that five hrs creep at the 10-hr ruptare rate in the range 1200 to 1400 deg F increased the room-temperature ultimate strength and yield strength and decreased ductility. (For preceding period see NP-8766.) (J.R.D.)
- Research Organization:
- Michigan. Univ., Ann Arbor. Coll. of Engineering
- NSA Number:
- NSA-14-018169
- OSTI ID:
- 4157528
- Report Number(s):
- NP-8767; UMRI-02902-2-P
- Country of Publication:
- United States
- Language:
- English
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