HIGH-TEMPERATURE MATERIALS PROGRAM. Progress Report No. 29, Part A
One to 10 hour stress-rupture and creep tests of arcmelted molybdenum TZM at 2000 and 2200 deg C in a hydrogen atmosphere show this material to be stronger than arcmelted molybdenum. This difference is decreased as the temperature is increased, When tested at 2600 deg C, powder metalhirgy W--25Re (at.%), sintered at 2400 deg C, has a higher rupture strength in hydrogen than in argon. Heat treatment at 2800 deg C prior to stress-rupture testing yields similar results at 2600 deg C in hydrogen or argon. The correlation of the stress-rupture time (t/sub R/) and minimum creep rate (mcr) data yields the empirical relationship t/sub R/ x mcr = c (c is a constant) for the refractory metals, tungsten, molybdenum, tantalum, and some of their alloys with W-25Re being a notable exception. The development program on fabricating high-quality W- -25Re alloys has shown that the agglomeration of fine tungsten powders must be prevented to minimize tungsten agglomerates in finished sheet. The fabrication of an elevated-temperature cartridge for irradiating refractory metals was completed. Creep-rupture testing of irradiated cold-worked tungsten flat specimens continued Several specimens were annealed at 1900 deg C for 1 hour and please delete the above abstract---finite, neutron-irradiated iron specimens. A Monte Carlo calculation was used to compute the number of primary knock-on atoms produced per incident neutron and their energy spectrum. (auth)
- Research Organization:
- General Electric Co. Advanced Technology Services, Cincinnati
- DOE Contract Number:
- AT(40-1)-2847
- NSA Number:
- NSA-18-007121
- OSTI ID:
- 4110416
- Report Number(s):
- GEMP-29A
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ANNEALING
ARGON
ATOMS
BORON
CHROMIUM ALLOYS
COLD WORKING
COMPUTERS
CREEP
DUCTILITY
ELECTRIC ARCS
ENERGY
FABRICATION
FAILURES
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN
IRON
IRON ALLOYS
IRRADIATION
MATERIALS TESTING
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
MOLYBDENUM ALLOYS
MONTE CARLO METHOD
NEUTRONS
NICKEL ALLOYS
NUMERICALS
POWDER METALLURGY
POWDERS
RADIATION DOSES
RADIATION EFFECTS
REFRACTORIES
RHENIUM ALLOYS
SINTERING
SPECTRA
STRESSES
TANTALUM
TEMPERING
TRACE AMOUNTS
TUBES
TUNGSTEN
TUNGSTEN ALLOYS