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Title: HIGH-TEMPERATURE MECHANICAL PROPERTIES OF TANTALUM

Abstract

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-grainedmore » thermally degassed material. (auth)« less

Authors:
; ; ;
Publication Date:
Research Org.:
Battelle Memorial Inst., Columbus, Ohio
OSTI Identifier:
4272168
Report Number(s):
BMI-1326
NSA Number:
NSA-13-010009
DOE Contract Number:  
W-7405-ENG-92
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; 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; NITROGEN; OXYGEN; PLANNING; RECRYSTALLIZATION; ROLLING; SHEETS; SINTERED MATERIALS; SODIUM; STABILITY; TANTALUM; VACUUM

Citation Formats

Drennen, D.C., Langston, M.E., Slunder, C.J., and Dunleavy, J.G. HIGH-TEMPERATURE MECHANICAL PROPERTIES OF TANTALUM. United States: N. p., 1959. Web. doi:10.2172/4272168.
Drennen, D.C., Langston, M.E., Slunder, C.J., & Dunleavy, J.G. HIGH-TEMPERATURE MECHANICAL PROPERTIES OF TANTALUM. United States. doi:10.2172/4272168.
Drennen, D.C., Langston, M.E., Slunder, C.J., and Dunleavy, J.G. Sun . "HIGH-TEMPERATURE MECHANICAL PROPERTIES OF TANTALUM". United States. doi:10.2172/4272168. https://www.osti.gov/servlets/purl/4272168.
@article{osti_4272168,
title = {HIGH-TEMPERATURE MECHANICAL PROPERTIES OF TANTALUM},
author = {Drennen, D.C. and Langston, M.E. and Slunder, C.J. and Dunleavy, J.G.},
abstractNote = {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)},
doi = {10.2172/4272168},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1959},
month = {3}
}