Creep strength of Zircaloy-4 cladding depending on applied stress and annealing temperature [rapid communication]
Abstract
Tube creep tests were conducted on low tin Zircaloy-4 cladding with variations given in final annealing temperatures of 769-893 K, test temperatures of 613-673 K and applied hoop stresses of 90-195 MPa. The enhanced creep rates of low tin Zircaloy-4 by a factor of 2 compared with standard Zicaloy-4 were observed mainly due to reduced tin content. It was found that the creep parameters had a considerable stress dependency, that is, the activation energy and stress exponent decreased with stress increment. The plausible contribution of Coble creep to low-temperature-annealed Zircaloys at a lower stress range is discussed based on the determined creep parameters, microstructure and texture to explain the observed stress dependency.
- Publication:
-
Journal of Nuclear Materials
- Pub Date:
- September 2002
- DOI:
- 10.1016/S0022-3115(02)00917-0
- Bibcode:
- 2002JNuM..305...70N