Effect of direction of approach to temperature on the delayed hydrogen cracking behavior of cold-worked Zr-2. 5Nb
The delayed hydrogen cracking behavior of cold-water Zr-2.5Nb at temperatures above about 423/sup 0/ K depends upon the direction of approach to test temperature. Cooling to the test temperatures results in an increase in crack growth rate, da/dt, with increase in temperature, given by the following Arrhenius relationship: da/dt = 6.86 x 10/sup -1/ exp(-71500/RT). Heating from room temperature results in the same increase in da/dt with temperature, but only up to a certain temperature, T/sub DAT/. The temperature, T/sub DAT/, increases with the amount of hydride precipitated during cooling to room temperature, prior to heating, and with cooling rate. The results obtained can be explained in terms of the Simpson and Puls model of delayed hydrogen cracking, if the hydride precipitated at the crack tip is initially fully constrained and the matrix hydride losses constraint during heating.
- Research Organization:
- Atomic Energy of Canada, Ltd., Chalk River, Ontario
- OSTI ID:
- 5322903
- Journal Information:
- Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States), Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States) Vol. 824; ISSN ASTTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHEMICAL REACTIONS
CRACK PROPAGATION
CRACKING
DECOMPOSITION
EMBRITTLEMENT
HYDROGEN EMBRITTLEMENT
NIOBIUM ALLOYS
PYROLYSIS
STRESS INTENSITY FACTORS
TEMPERATURE EFFECTS
THERMOCHEMICAL PROCESSES
TUBES
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS