HIGH-TEMPERATURE NIOBIUM-BASE ALLOYS FOR SODIUM-COOLED REACTORS

Technical Report · Thu Apr 13 23:00:00 EST 1961

OSTI ID:4014704

DeMastry, J A; Shober, F R; Dickerson, R F

In work to develop fuel-element cladding material for the EBR-II, binary Nb alloys containing 2.37 wt.% Cr, 3.34 wt.% Zi, or 5.21 wt.% V and a tenary alloy containing 1.56 wt.% Zr and 1.09 wt.% Cr were fabricated by foi-ging at 550 deg C and rolling to sheet or by rod rolling at 1200 deg C in a stainless steel can. All four alloys were completely recrystallized after 90% cold work (reductlon in thickness) and a 1-hr. anneal at 1149 deg C. Tensile tests on the annealed materials at 650, 800, 1000, 1150, and 1315 deg C indicated that Cr, Zr, and V are potent strengtheners of Nb: -the 2.37 wt.% Cr alloy had a 0.2% offset yield strength of 38,000 psl at 1000 deg C, and the 5.21 wt.% V alloy had a yield strength of 38,300 psi. At 1315 deg C, the 3.34 wt.% Zr alloy had a 0.2% offset yield strength of 14,700 psi; the 1.56 wt.% Zr--1.09 wt.% Cr alloy had a yield strength of 13,500 psi at 1315 deg C. Stresses to produce creep rates of 0.001, 0.01, and 0.1% per hr. were determined for the binary alloys at 650, 800, and 1000 C. The V alloy exhibited the greatest creep reslstance, requiring stresses of 52,700, 40,000, and 15,500 psi to produce a creep rate of 0.001% per hr. at 650, 800, and 1000 deg C, respectively. (auth)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• DOE Contract Number: W-7405-ENG-92
• NSA Number: NSA-15-018482
• OSTI ID: 4014704
• Report Number(s): BMI-1513
• Country of Publication: United States
• Language: English

Related Subjects

ANNEALING
CANNING
CHROMIUM ALLOYS
COLD WORKING
CREEP
EBR-2
FABRICATION
FORGING
FUEL ELEMENTS
HIGH TEMPERATURE
HOT WORKING
LIQUID METAL COOLANT
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
REACTORS
RECRYSTALLIZATION
RESEARCH REACTORS
ROLLING
SHEETS
SODIUM
STABILITY
STAINLESS STEELS
STRESSES
TEMPERATURE
TENSILE PROPERTIES
VANADIUM ALLOYS
ZIRCONIUM ALLOYS