Effect of texture on hydride reorientation and delayed hydrogen cracking in cold-worked Zr-2. 5Nb
Hydride reorientation and delayed hydrogen cracking have been evaluated in specimens cut from the longitudinal and circumferential directions of cold-worked Zr-2.5Nb pressure tubes. In this material basal plane normals were highly concentrated in the circumferential direction. In longitudinal specimens hydrides did not reorient, cracks were not initiated, and artificial cracks grew slowly, whereas in circumferential specimens hydrides reoriented easily, cracks could be initiated, and grew 25 times faster than cracks in longitudinal specimens. Reorientation of hydrides is not necessary for delayed hydrogen cracking, but the degree of reorientation controls cracking susceptibility. Crystallographic texture regulates hydride reorientation and a rotation of basal plane normals from the circumferential to radial direction should reduce the susceptibility of Zr-2.5Nb and other zirconium alloys to delayed hydrogen cracking. 23 refs.
- Research Organization:
- AECL, Chalk River, Ont, Can
- OSTI ID:
- 6460707
- Report Number(s):
- CONF-800834-
- Journal Information:
- Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States), Journal Name: Am. Soc. Test. Mater., Spec. Tech. Publ.; (United States); ISSN ASTTA
- Country of Publication:
- United States
- Language:
- English
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Crack initiation at long radial hydrides in Zr-2. 5Nb pressure tube material at elevated temperatures
Effect of direction of approach to temperature on the delayed hydrogen cracking behavior of cold-worked Zr-2. 5Nb
Related Subjects
210400* -- Power Reactors
Nonbreeding
Otherwise Moderated or Unmoderated
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CANDU TYPE REACTORS
COLD WORKING
CRACK PROPAGATION
CRYSTAL STRUCTURE
ELEMENTS
EMBRITTLEMENT
FABRICATION
HEAVY WATER MODERATED REACTORS
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN EMBRITTLEMENT
MATERIALS WORKING
METALLURGICAL EFFECTS
NIOBIUM ALLOYS
NONMETALS
PRESSURE TUBE REACTORS
PRESSURE TUBES
REACTORS
TEXTURE
THERMAL REACTORS
TUBES
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS