DELAYED FAILURE HYDROGEN EMBRITTLEMENT OF ZIRCONIUM. Summary Report, September 15, 1961 to September 14, 1962
The extent to which zirconium and zirconium alloys exhibit delayed failure (static fatigue) as caused by a combination of absorbed hydrogen and applied stress was investigated. Susceptibility to time-dependent fracture was evaluated for unalloyed zirconium and Zircaloy-2 with 200 and 500 ppm hydrogen as well as for an experimental Zr Al-Sn-Mo alloy and the Canadian Zr-2.5Nb cladding material. For unalloyed zirconium and Zircaloy-2 containing up to 500 ppm hydrogen, no room-temperature, timedependent fracture occurred which could be definitely attributed to the delayed failure phenomenon; an increased grain size, 20% cold deformation by rolling, or corrosion in 750 deg F steam did not significantly affect this behavior. The curve of applied stress versus time to failure at room temperature for the high-strength Zr-Al-Sn--Mo alloy containing 500 ppm hydrcgen established a strong susceptibility to delayed failure due to hydrogen absorption; studies on vacuum-annealed material showed no failures. Further, reduced temperature indicated that the occurrence of static fatigue is temperature dependent. Data for heattreated Zr 2.5Nb containing 500 ppm hydrogen indicated that this material is moderately sensitive to delayed failure at room temperature; higher hydrogen contents caused a greatly increased susceptibility to time-dependent fracture. (auth)
- Research Organization:
- Illinois Inst. of Tech., Chicago. Armour Research Foundation
- NSA Number:
- NSA-17-000526
- OSTI ID:
- 4794705
- Report Number(s):
- ARF-2230-12
- Country of Publication:
- United States
- Language:
- English
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SUSCEPTIBILITY OF ZIRCONIUM AND ZIRCONIUM ALLOYS TO DELAYED FAILURE HYDROGEN EMBRITTLEMENT
DELAYED FAILURE HYDROGEN EMBRITTLEMENT OF ZIRCONIUM. Quarterly Report No. 2, December 15, 1961 to March 14, 1962
Related Subjects
ALUMINUM ALLOYS
ANNEALING
COLD WORKING
CORROSION
FAILURES
FATIGUE
GRAIN SIZE
HEAT TREATMENTS
HIGH TEMPERATURE
HYDROGEN
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
QUANTITY RATIO
REPORT
ROLLING
STEAM
STRESSES
TEMPERATURE
TIN ALLOYS
VACUUM
ZIRCALOY
ZIRCONIUM
ZIRCONIUM ALLOYS