Influence of surface condition on crack initiation in iodine-induced stress corrosion cracking of zircaloys
The effect of surface condition on the initiation of iodine-induced stress corrosion cracks in Zircaloy tubing was investigated. The internal surface of the Zircaloy tubing was given one of three surface treatments, namely etching, grit blasting, or shot blasting. Each of these treatments can readily be performed commercially on Zircaloy fuel cladding. Specimens of surface-treated tubing were locally stressed in an iodine environment at 590 K by indenting the outer surface of the tube wall with a small steel ball. The crack initiation pattern on the inner surface was examined in a scanning electron microscope. Crack initiation was found to be least developed for etched surfaces, was most developed for shot-blasted surfaces, and was developed to an intermediate degree for grit-blasted surfaces. Apparent anomalies between these crack initiation data and the time to failure data obtained previously in tube pressurization tests are rationalized on the basis of the cracking processes.
- Research Organization:
- SRI International, Menlo Park, California 94025
- OSTI ID:
- 6835115
- Journal Information:
- Nucl. Technol.; (United States), Vol. 55:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
FUEL CANS
FRACTURE PROPERTIES
IMPACT TESTS
STRESS CORROSION
ZIRCALOY
COMPARATIVE EVALUATIONS
CORROSIVE EFFECTS
CRACK PROPAGATION
DESTRUCTIVE TESTING
ETCHING
EXPERIMENTAL DATA
FAILURES
FRACTURE MECHANICS
HIGH TEMPERATURE
IODINE
SCANNING ELECTRON MICROSCOPY
STRESS ANALYSIS
SURFACE PROPERTIES
SURFACE TREATMENTS
TIME DEPENDENCE
ALLOYS
CHEMICAL REACTIONS
CORROSION
DATA
ELECTRON MICROSCOPY
ELEMENTS
HALOGENS
INFORMATION
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MECHANICS
MICROSCOPY
NONMETALS
NUMERICAL DATA
SURFACE FINISHING
TESTING
TIN ALLOYS
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS
220300* - Nuclear Reactor Technology- Fuel Elements
360103 - Metals & Alloys- Mechanical Properties
360105 - Metals & Alloys- Corrosion & Erosion