Fractography and mechanisms of environmentally enhanced fatigue crack propagation of a reactor pressure vessel steel
This paper describes the findings and interpretations of the fractographic survey conducted for the International Cyclic Crack Growth Rate (ICCGR) cooperative group round-robin specimens. Specimens of A533B pressure vessel steel were tested at several laboratories in the United States and elsewhere with the same nominal test parameters. A rather wide scatter of the results was found. A fractographic and metallographic survey was carried out in order to clarify the scatter and to evaluate the micromechanism of the crack growth. The fractographic findings are reported in detail and correlated to the crack growth behavior. A hydrogen-assisted crack propagation mechanism based on the fractography is proposed and applied to the observed crack growth behavior.
- Research Organization:
- Technical Research Center of Finland, Espoo
- OSTI ID:
- 6331160
- Report Number(s):
- CONF-8110309-
- Journal Information:
- Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States), Vol. STP-801; Conference: Symposium on corrosion fatigue - mechanics, metallurgy, chemistry, and engineering, St. Louis, MO, USA, 21 Oct 1981
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
PRESSURE VESSELS
CRACK PROPAGATION
ENVIRONMENTAL EFFECTS
FATIGUE
FRACTOGRAPHY
STEELS
DESTRUCTIVE TESTING
HYDROGEN
METALLOGRAPHY
MICROSTRUCTURE
ALLOYS
CONTAINERS
CRYSTAL STRUCTURE
ELEMENTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
NONMETALS
TESTING
220200* - Nuclear Reactor Technology- Components & Accessories
360103 - Metals & Alloys- Mechanical Properties