Effects of crystallographic orientation on plastic deformation and SCC initiation of zirconium alloys

Kubo, Tetsuo; Wakashima, Yoshiaki; Amano, K.; Nagai, Masayuki

doi:10.1016/0022-3115(85)90386-1

Cited by 35 publications

(14 citation statements)

References 7 publications

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“…First, the GB will be embrittled locally because it has a large amount of impurities such Fe, Al, Si and Cr [19]. Second, if a sufficient hoop stress is applied to the surface then a slip band will be formed around the GB surface thus increasing the instability [20,21]. These aspects support our results as why the pitting preferentially nucleates, grows and coalescences around the GB.…”

Section: Microcrack Nucleation and Crack Initiationsupporting

confidence: 76%

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

Park¹,

Kim²,

Lee³

et al. 2008

Journal of Nuclear Materials

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Section: Microcrack Nucleation and Crack Initiationsupporting

confidence: 76%

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

Park¹,

Kim²,

Lee³

et al. 2008

Journal of Nuclear Materials

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“…First, the GB is embrittled locally because it has a large amount of impurities such as Fe, Al, Si and Cr [19]. Second, if sufficient hoop stress is applied to the surface, then a slip band forms around a GB surface, thereby increasing instability [20,21]. These aspects support our experimental results and explain why the pitting preferentially nucleates and grows around the GB.…”

Section: Pitting Nucleation At the Grain Boundarysupporting

confidence: 82%

Crack initiation and propagation behavior of zirconium cladding under an environment of iodine-induced stress corrosion

et al. 2007

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Tests of iodine-induced stress corrosion cracking (ISCC) were carried out to elucidate the initiation and propagation of cracks in the claddings of zirconium alloys. Zircaloy-4 cladding and Nb-contained zirconium cladding were pressurized with and without a pre-cracked state at 350 o C in an iodine environment. The results show that pitting nucleation and growth play an important role in initiating ISCC. Pits preferentially grow and agglomerate around the grain boundary, where the number of pits increases with the iodine concentration and the hoop stress of the claddings. A model of grain-boundary pitting coalescence and a model of pitting-assisted slip cleavage, which were proposed to clearly elucidate the crack initiation and propagation process under ISCC, produce reasonable results. The Nb-contained zirconium cladding exhibits higher ISCC resistance than Zircaloy-4 from the standpoint of a higher threshold stress-intensity factor and a lower crack propagation rate.

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“…The preceding results also showed that the necessary factors for the SCC initiation are as follows: strain incompatibility/localized stress concentration [8] and grain boundary perpendicular to applied stress [4]. The first factor is related to pair grains orientation between grain boundaries, except the relationship between applied stress and grain boundary.…”

Section: B Effect Of Texture On Initiation and Propagationmentioning

confidence: 79%

The I-SCC behavior of N18 alloy at constant strain rate

Dai

Zhao

Wang

2009

2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications

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Index Term-N18 alloy, Iodine, Iodine-induced stress corrosion cracking, Constant strain rateAbstract-To evaluate ISCC behaviors of as-received and refabricated N18 alloy sheets, the tensile tests were conducted at the constant strain rate in the different medium including air, ethanol, and iodine ethanol at room temperature and the iodine vapor at 350°C and 400°C. The effects of iodine concentration, strain rate, alloy composition and texture on I-SCC behavior of zirconium alloys were investigated. The results indicate that N18 alloy would become more susceptible to SCC as iodine concentration increase and stain rate decrease or re-fabrication, and SCC sensibility of N18 alloy would be influenced not by iodine pressure but temperature in iodine vapor. The chemical composition difference between N18 and zircaloy-4 would hardly affect SCC behavior, but the texture would have strong influence on SCC for N18 alloy although there is a little difference between transverse direction (TD) and rolling direction (RD) specimens. The stress corrosion initiation mechanism must therefore be analyzed as a corrosion-strain interaction linked to the chemical effects and mechanical effects.

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Effects of crystallographic orientation on plastic deformation and SCC initiation of zirconium alloys

Cited by 35 publications

References 7 publications

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

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

Crack initiation and propagation behavior of zirconium cladding under an environment of iodine-induced stress corrosion

The I-SCC behavior of N18 alloy at constant strain rate

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