Observation and quantification of the diffusion-induced grain boundary migration ahead of SCC crack tips

Shen, Zhao; Karamched, Phani; Arioka, Koji; Lozano-Pérez, Sergio

doi:10.1016/j.corsci.2018.11.019

Cited by 21 publications

(24 citation statements)

References 26 publications

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“…10d reveals that the intergranular oxidation propagates along the Ni-rich zone-matrix interface but not through the Ni-rich zone. Similar results have also been reported in the literature and the Ni-rich zone observed ahead of the tip has been proved to be GB migration (GBM) [13,14,19,20,23,42,44,45].…”

Section: Oxidation Around Igscc Crack Tipsupporting

confidence: 90%

Section: Comparison Between Surface and Crack Tip Oxidationsupporting

confidence: 71%

“…The Ni-rich region is also observed in front of the crack tips examined in this work, which is believed to be associated with the GBM [13,14,19,20,23,42,44,45,65]. Since the Nirich region is depleted in Cr and Fe, the formation of GBM is believed to be due to outward diffusion of Cr and Fe, which is referred to as diffusion induced GBM (DIGM) in the literature [13,19,20,23,42,44,45,65]. Since the signal intensity of Ni in the Ni-rich region is higher than in the unaffected matrix, it suggests that the Ni from the surrounding region, possibly the region now occupied by the IOZ, has been expulsed into this region.…”

Section: Comparison Between Surface and Crack Tip Oxidationmentioning

confidence: 59%

“…IOZ has been observed by many researchers and is reported to be associated with the formation of a Ni-rich region [13,14,19,20,23,42,44,45,65]. The Ni-rich region is also observed in front of the crack tips examined in this work, which is believed to be associated with the GBM [13,14,19,20,23,42,44,45,65]. Since the Nirich region is depleted in Cr and Fe, the formation of GBM is believed to be due to outward diffusion of Cr and Fe, which is referred to as diffusion induced GBM (DIGM) in the literature [13,19,20,23,42,44,45,65].…”

Section: Comparison Between Surface and Crack Tip Oxidationmentioning

confidence: 90%

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A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

Chen

Shen

2020

Corrosion Science

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Surface, stagnant grain boundary (GB), and crack tip oxidation of Alloy 600 were studied. The mirror-finished surface oxide has a duplex structure and the formation mechanisms of each layer are discussed. A more compact oxide film is observed on the cold-worked surface, while the nano-GBs are preferentially oxidized. The crack tip oxidation rate is around four orders of magnitude faster than that of the stagnant GB, and their oxidation mechanisms are believed to be the same. Diffusion-induced grain boundary migration (DIGM) is observed around the crack and oxidized GB tips. The role of Ni expulsion on the DIGM is discussed.

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Section: Oxidation Around Igscc Crack Tipsupporting

confidence: 90%

Section: Comparison Between Surface and Crack Tip Oxidationsupporting

confidence: 71%

Section: Comparison Between Surface and Crack Tip Oxidationmentioning

confidence: 59%

Section: Comparison Between Surface and Crack Tip Oxidationmentioning

confidence: 90%

See 2 more Smart Citations

A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

Chen

Shen

2020

Corrosion Science

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“…According to the recent work conducted in literature [5,21,22,30,47], the Ni-rich zone formed ahead of the crack tip was found to be the result of diffusion-induced grain boundary migration (DIGM). The authors believed that the DIGM occurred once the solute elements (such as Cr and Fe) were selectively oxidized.…”

Section: The Mechanism Controlling the Crack Propagationmentioning

confidence: 99%

Characterization of the crack initiation and propagation in Alloy 600 with a cold-worked surface

et al. 2019

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The crack initiation on a cold-worked surface of Alloy 600, exposed to simulated pressurized water reactor primary water, was mechanistically studied through high-resolution characterization. Mechanical polishing introduced a thin recrystallization layer on the specimen surface, which lead to the crack initiation along highlydeformed recrystallization grain boundaries after preferential oxidation. Intergranular crack propagation occurred once the initiation cracks met the matrix grain boundaries under the external loading and the residual stress introduced by the prior 20% cold working. The controlling mechanism of SCC crack propagation was believed to be an intergranular selective oxidation mechanism.

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Understanding the role of Diffusion Induced Grain Boundary Migration on the preferential intergranular oxidation behaviour of Alloy 600 via advanced microstructural characterization

2019

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Observation and quantification of the diffusion-induced grain boundary migration ahead of SCC crack tips

Cited by 21 publications

References 26 publications

A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

A study on the surface and crack tip oxidation of alloy 600 through high-resolution characterization

Characterization of the crack initiation and propagation in Alloy 600 with a cold-worked surface

Understanding the role of Diffusion Induced Grain Boundary Migration on the preferential intergranular oxidation behaviour of Alloy 600 via advanced microstructural characterization

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