Measurement of fracture toughness of hydrided Zircaloy - 4

Callaghan, MD; Yeung, WY; Ripley, MI; Carr, DG

Measurement of fracture toughness of hydrided Zircaloy - 4

Callaghan, MD Yeung, WY Ripley, MI Carr, DG

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Publication Type:: Journal Article
Citation:: Materials Forum, 2004, 27 pp. 68 - 73
Issue Date:: 2004-12-01

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Field	Value	Language
dc.contributor.author	Callaghan, MD	en_US
dc.contributor.author	Yeung, WY	en_US
dc.contributor.author	Ripley, MI	en_US
dc.contributor.author	Carr, DG	en_US
dc.date.issued	2004-12-01	en_US
dc.identifier.citation	Materials Forum, 2004, 27 pp. 68 - 73	en_US
dc.identifier.issn	0883-2900	en_US
dc.identifier.uri	http://hdl.handle.net/10453/5694
dc.description.abstract	Zircaloy-4 is a zirconium alloy that will be used for construction of many of the core components in the replacement research reactor at Lucas Heights. The fracture toughness of the alloy and its radiation-induced reduction over the 40 year planned life of the reactor is an important mechanical property for this application. This study aims to simulate the radiation-induced reduction in fracture toughness by hydriding Zircaloy-4. A range of fracture toughnesses is required to calibrate the sub-size Charpy and small punch (SP) surveillance specimens that will be irradiated over the life of the reactor against standard J1C fracture toughness specimens. Pieces of Zircaloy-4 plate were hydrided in a vessel at a temperature of 520°C, at different pressures for either 10 or 22 hours. Final hydrogen concentrations between 25 wt% ppm and 380 wt% ppm hydrogen were obtained under gaseous atmosphere. The fracture toughness of the hydrided Zircaloy-4 was assessed using sub-size 2.5 mm-thick Charpy, three-point bend J1C and SP tests. The results were correlated to determine the relationship between the J-integral fracture toughness, Charpy impact energy and equivalent fracture strain (εqf) from the SP tests. It was found that as hydrogen concentration and hydride formation increased, the fracture toughness of the alloy generally decreased. The results show there to be a useful relationship between fracture toughness and εqf measured for the SP tests. © Institute of Materials Engineering Australasia Ltd - Materials Forum Volume 27 - Published 2004.	en_US
dc.relation.ispartof	Materials Forum	en_US
dc.title	Measurement of fracture toughness of hydrided Zircaloy - 4	en_US
dc.type	Journal Article
utslib.citation.volume	27	en_US
utslib.for	0204 Condensed Matter Physics	en_US
utslib.for	0912 Materials Engineering	en_US
dc.location.activity	Eindhoven, Netherlands
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Chemistry and Forensic Science
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	27	en_US

Abstract:

Zircaloy-4 is a zirconium alloy that will be used for construction of many of the core components in the replacement research reactor at Lucas Heights. The fracture toughness of the alloy and its radiation-induced reduction over the 40 year planned life of the reactor is an important mechanical property for this application. This study aims to simulate the radiation-induced reduction in fracture toughness by hydriding Zircaloy-4. A range of fracture toughnesses is required to calibrate the sub-size Charpy and small punch (SP) surveillance specimens that will be irradiated over the life of the reactor against standard J1C fracture toughness specimens. Pieces of Zircaloy-4 plate were hydrided in a vessel at a temperature of 520°C, at different pressures for either 10 or 22 hours. Final hydrogen concentrations between 25 wt% ppm and 380 wt% ppm hydrogen were obtained under gaseous atmosphere. The fracture toughness of the hydrided Zircaloy-4 was assessed using sub-size 2.5 mm-thick Charpy, three-point bend J1C and SP tests. The results were correlated to determine the relationship between the J-integral fracture toughness, Charpy impact energy and equivalent fracture strain (εqf) from the SP tests. It was found that as hydrogen concentration and hydride formation increased, the fracture toughness of the alloy generally decreased. The results show there to be a useful relationship between fracture toughness and εqf measured for the SP tests. © Institute of Materials Engineering Australasia Ltd - Materials Forum Volume 27 - Published 2004.

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