Dispersion-Strengthened Vanadium Alloys (Final Report, December 14, 1962-December 13, 1963)

Technical Report · Fri Jan 10 00:00:00 EST 1964

DOI:https://doi.org/10.2172/4060143· OSTI ID:4060143

Holtz, F. C. ^[1]; Richard, L. B. ^[1]

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1. Illinois Institute of Technology, Chicago, IL (United States). IIT Research Inst.

Vanadium-columbium base alloys containing additions of titanium, zirconium, or hafnium in combination with up to 0.2w/o carbon were prepared by arc-melting and fabricated to sheet for elevated temperature creep tests. Compositions based on V-60Cb and containing titaniun or zirconium with carbon had good fabricability, but V-60Nb1Hf-C and V-40Cb-30Ta-C alloys were difficult to work. Creep tests conducted on siliconized specimens in 2000° F air showed that large carbon additions (0.1 and 0.2w/o) produced increased creep rates in V-60Cb - 10Ta-1Zr-O. 075C which exhibited 1. 25 percent creep in 2.5 hours under a stress of 11,200 psi. This alloy and other materials which elongated less than 2 percent during the 2000° F air exposure were found to retain most of their original strength and ductility when subsequently tested at or near room temperature. Electron microscope studies revealed that the more creep resistant alloys contained a fine (< 0. 2 micron) spheroidal dispersed phase within the grains, whereas alloys with higher creep rates contained grain boundary precipitates. A series of powder metallurgy alloys based on V-60Cb-1Ti and containing oxide or carbide dispersants was prepared to evaluate the compatibility of various dispersants with the vanadium-columbium alloy matrix . The hydride process was used to prepare the alloy powders which were blended with the dispersant powders, compacted, sintered, then annealed at 2000 and 2400°F. On the basis of microhardness tests of the alloy matrix, hafnium and zirconium carbides appeared to be the most stable at 2400° F.

• Research Organization: Illinois Institute of Technology, Chicago, IL (United States). IIT Research Inst.
• Sponsoring Organization: USDOD
• NSA Number: NSA-18-027858
• OSTI ID: 4060143
• Report Number(s): IITRI--B6007-6; AD--427343; AD0427343
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBIDES
CREEP
ELECTRIC ARCS
FABRICATION
HAFNIUM ALLOYS
HIGH TEMPERATURE
MATERIALS TESTING
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
PREPARATION
SHEETS
STABILITY
STRESSES
TANTALUM ALLOYS
TITANIUM ALLOYS
VANADIUM ALLOYS
ZIRCONIUM ALLOYS
carbides
carbon alloys
coatings
creep
dispersion hardening
electric arcs
electron microscopy
hafnium alloys
hardness
heat treatment
high temperature
material forming
mechanical properties
melting
microstructure
niobium alloys
oxides
powder metallurgy
recrystallization
rolling(metallurgy)
scientific research
silicides
tantalum alloys
titanium alloys
vanadium alloys
zirconium alloys