Stress-corrosion crack initiation and propagation behavior of Zircaloy-4 cladding under an iodine environment

Park, Soo‐Jin; Kim, Junhwan; Lee, Myoung Ho; Jeong, Yong Hwan

doi:10.1016/j.jnucmat.2007.03.258

Cited by 12 publications

(5 citation statements)

References 16 publications

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“…For each of the studies, nearly identical values were found for the threshold stress below which no I-SCC failure occurred. In the present study and in Park's study [13], the value of the threshold stress is approximately 240 MPa, and in the study performed by Rouillon (published in Ref. [23]), the value is approximately 290 MPa.…”

Section: Comparison With Other Researchsupporting

confidence: 64%

“…This phenomenon has been commonly observed during the corrosion of bulk zirconium by iodine vapor [5,13,18]. Pits can be isolated or coalesced into large pit clusters.…”

Section: Pitting and Crackingmentioning

confidence: 88%

“…4 shows SEM micrographs of a crack face after an I-SCC test, which reveals a region of brittle cracking surrounded by a zone exhibiting many dimples that indicate ductile tearing. The region of brittle cracking corresponds to the propagation of a stress corrosion crack, and the surrounding ductile tearing region corresponds to the final failure of the tube due to the increased local stress after the stress corrosion crack had penetrated a certain distance into the material [9,13,19,20]. Many pits are evident on the part of the crack face near the inner surface of the tube (Fig.…”

Section: Pitting and Crackingmentioning

confidence: 99%

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Stress corrosion crack initiation of Zircaloy-4 cladding tubes in an iodine vapor environment during creep, relaxation, and constant strain rate tests

Jezequel

Auzoux

Boulch

et al. 2018

Journal of Nuclear Materials

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. The experimental results showed that the apparent threshold hoop stress for I-SCC was found to be independent of the test temperature. A model for the time-to-failure of a cladding tube was developed using finite element simulations of the viscoplastic mechanical behavior of the material and a modified Kachanov's damage growth model. The times-to-failure predicted by this model are consistent with the experimental data. a b s t r a c tDuring accidental power transient conditions with Pellet Cladding Interaction (PCI), the synergistic effect of the stress and strain imposed on the cladding by thermal expansion of the fuel, and corrosion by iodine released as a fission product, may lead to cladding failure by Stress Corrosion Cracking (SCC). In this study, internal pressure tests were conducted on unirradiated cold-worked stress-relieved Zircaloy-4 cladding tubes in an iodine vapor environment. The goal was to investigate the influence of loading type (constant pressure tests, constant circumferential strain rate tests, or constant circumferential strain tests) and test temperature (320, 350, or 380 C) on iodine-induced stress corrosion cracking (I-SCC). The experimental results obtained with different loading types were consistent with each other. The apparent threshold hoop stress for I-SCC was found to be independent of the test temperature. SEM micrographs of the tested samples showed many pits distributed over the inner surface, which tended to coalesce into large pits in which a microcrack could initiate. A model for the time-to-failure of a cladding tube was developed using finite element simulations of the viscoplastic mechanical behavior of the material and a modified Kachanov's damage growth model. The times-to-failure predicted by this model are consistent with the experimental data.

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Section: Comparison With Other Researchsupporting

confidence: 64%

“…This phenomenon has been commonly observed during the corrosion of bulk zirconium by iodine vapor [5,13,18]. Pits can be isolated or coalesced into large pit clusters.…”

Section: Pitting and Crackingmentioning

confidence: 88%

Section: Pitting and Crackingmentioning

confidence: 99%

See 1 more Smart Citation

Stress corrosion crack initiation of Zircaloy-4 cladding tubes in an iodine vapor environment during creep, relaxation, and constant strain rate tests

Jezequel

Auzoux

Boulch

et al. 2018

Journal of Nuclear Materials

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show abstract

“…There are a large number of differences between the two experiments presented. The different loading regimes, fixed load or fixed strain rate, have been shown to control to alter the proportions of IG and TG failure modes, but have no effect on the orientation dependence [18,24]. Although the alloy composition is different, resulting in a different strength of the materials, alloy composition has not been observed to have a significant effect on I-SCC mechanics [32].…”

Section: Resultsmentioning

confidence: 99%

“…The high levels of local misorientation in this region demonstrate clearly that there were stresses that were sufficient to cause deformation close to this grain boundary, inducing significant deformation but not causing fracture.For comparison, the TKD orientation map and SE image from the crack tip region of a non-irradiated C-ring are shown in Figure3 (c) and (d). The SE image shows a less planar, complex crack morphology in this sample, characteristic of intergranular corrosion/cracking in zirconium alloys[24]. In addition, significant degradation of the GBs surrounding the crack tip can be observed in the SE image.…”

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confidence: 76%