CONTRIBUTION TO THE DEVELOPMENT OF CORROSION-RESISTANT ZIRCONIUM ALLOYS WITH HIGH STRENGTH FOR REACTOR CONSTRUCTION (in German)
The corrosion resistance of zirconium alloys containing up to 5% niobium and up to 1% tin with additions of palladium, chromium, and molybdenum was investigated by exposing the specimens to 350 deg C water and 400 and 480 deg C steam. With an appropriate heat treatment the zirconiumniobium alloys have nearly the same corrosion resistance as Zircaloy-2. The best corrosion resistance was attained by annealing below the alpha - BETA transformation temperature of 590 deg C. With this heat treatment the corrosion resistance is independent of the niobium content. Annealing above 600 deg C causes the appearance of BETA /sub Zr/ which has an unfavorable effect on the corrosion behavior. The effect of the heat treatment is greater at the lower corrosion temperatures. Tin additions have a favorable influence in 350 deg C water, no effect in 400 deg C steam and an unfavorable influence in 480 deg C steam. Niobium-containing alloys pick up less corrosionproduced hydrogen than Zircaloy-2. Annealing in a hydrogen atmosphere results in a lower hydrogen pick up rate in the niobium-containing alloys than in Zircaloy-2. An alloy with 3% niobium and 1% tin has excellent corrosion resistance, hydrogen pick-up, and strength properties. Longterm creep tests show a clear superiority of the Zr3%Nb1%Sn alloy over the Zr2%Nb alloy and Zircaloy-2. (auth)
- Research Organization:
- Metallaboratorium der Metallgesellschaft A.G., Frankfurt am Main
- NSA Number:
- NSA-17-006581
- OSTI ID:
- 4750805
- Journal Information:
- Z. Metallk., Vol. Vol: 53; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
Similar Records
SECOND QUARTERLY REPORT ON ALLOYS OF Zr WITH Nb AND Sn , JULY 1, 1961- SEPTEMBER 30, 1961
RESEARCH ON ZIRCONIUM ALLOYS WITH NIOBIUM AND/OR SILICON WITH A VIEW TO THEIR USE AS CLADDING MATERIAL IN WATER-COOLED NUCLEAR REACTORS. Quarterly Report No. 4, January 1, 1961-March 31, 1961
Related Subjects
ABSORPTION
ADDITIVES
ALLOTROPY
ANNEALING
CHROMIUM
CORROSION PROTECTION
CREEP
EXPLOSIVES
GAMMA RADIATION
GASES
HIGH TEMPERATURE
HYDROGEN
IRRADIATION
MATERIALS TESTING
MOLYBDENUM
NIOBIUM ALLOYS
PALLADIUM
PHASE DIAGRAMS
RADIATION CHEMISTRY
RADIATION EFFECTS
STEAM
TEMPERATURE
TIN ALLOYS
WATER
ZIRCALOY
ZIRCONIUM ALLOYS