HIGH-TEMPERATURE MECHANICAL PROPERTIES OF TANTALUM

Technical Report · Sun Mar 01 04:00:00 EST 1959

DOI:https://doi.org/10.2172/4272168· OSTI ID:4272168

Drennen, D. C.; Langston, M. E.; Slunder, C. J.; Dunleavy, J. G.

Creep and creep-rupture tests were performed at 1200 F in the helium on arc-cast and on sintered rolled tantalum sheet to investigate the effect of structure and gaseous contamination on the creep resistance of tantalum. A vacuum-induction furnace was developed for annealing and for degassing the as- received coldworked material. The tests were conducted with inertatmosphere resistance creep furnaces designed to prevent excessive interstitial-element pickup. The effect of hydrogen, nitrogen, and oxygen on the high-temperature strength of tantalum was not clearly discernible. Degassing of annealed sintered tantalum in flowing sodium produced in a lower oxygen contamination, but had no significant effect on creep resistance. The method of manufacture, the grain size, and the treatments performed on the material, on the other hand, produced a substantial effect on creep resistance. Annealed arccast tantalum possessed somewhat higher creep resistance at 1200 F than did annealed sintered tantalum. The highest creep resistance was found in a fine-grained sintered material which had been degassed 20 to 60 min at 4500 to 4650 F, cold rolled to an 80% reduction, and then recrystallized 10 to 15 min at about 2800 F prior to creep testing. The lowest creep resistance was noted for an extremely coarse-grained thermally degassed material. (auth)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• DOE Contract Number: W-7405-ENG-92
• NSA Number: NSA-13-010009
• OSTI ID: 4272168
• Report Number(s): BMI-1326
• Country of Publication: United States
• Language: English

Related Subjects

ADSORPTION
ANNEALING
CASTING
COLD WORKING
CONTAMINATION
CREEP
DEFECTS
DEGASSING
ELECTRIC ARCS
EXPANSION
FABRICATION
FAILURES
FLUID FLOW
FURNACES
GASES
GRAIN SIZE
HELIUM
HIGH TEMPERATURE
HYDROGEN
INDUCTION
INERT GASES
INTERSTITIALS
LATTICES
MATERIALS TESTING
MECHANICAL PROPERTIES
METALLURGY AND CERAMICS
NITROGEN
OXYGEN
PLANNING
RECRYSTALLIZATION
ROLLING
SHEETS
SINTERED MATERIALS
SODIUM
STABILITY
TANTALUM
VACUUM