Mechanistic understanding of the temperature dependence of crack growth rate in alloy 600 and 316 stainless steel through high-resolution characterization

Shen, Zhao; Meisnar, Martina; Arioka, Koji; Lozano-Pérez, Sergio

doi:10.1016/j.actamat.2018.11.039

Cited by 43 publications

(28 citation statements)

References 47 publications

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“…As reported in our prior work [15], the cold-work will lead to preferential deformation and higher defect density around grain boundaries. We can then consider if internal oxidation might also occur along intergranular cracks.…”

Section: A Careful Examination Ofsupporting

confidence: 69%

“…Austenitic 316 stainless steel (SS) has been widely used in PWRs as structural components due to its combination of good mechanical properties and high general corrosion resistance [4,[14][15][16][17][18][19]. However, it also suffers from IGSCC [4,[14][15][16][17][18][19]. However, the IOM has generally not been considered as a plausible IGSCC mechanism for austenitic SS.…”

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confidence: 99%

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Observation of internal oxidation in a 20% cold-worked Fe-17Cr-12Ni stainless steel through high-resolution characterization

et al. 2019

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It is often assumed that internal oxidation cannot occur at temperatures below 400ºC. However, in the present work, internal oxidation was observed in a 20% cold-worked Fe-17Cr-12Ni stainless steel (SS) after exposure to simulated primary water of a pressurized water reactor at 340ºC and not in a similarly tested sample without prior cold-work. The formation of discrete Cr-oxide precipitates and the role of cold-work are discussed. The internal oxidation model is also proposed as a plausible stress corrosion cracking mechanism of Fe-17Cr-12Ni SS at that temperature.

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Section: A Careful Examination Ofsupporting

confidence: 69%

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confidence: 99%

Observation of internal oxidation in a 20% cold-worked Fe-17Cr-12Ni stainless steel through high-resolution characterization

et al. 2019

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“…The red and green pixels represented ferrite (metal matrix) and chromite (oxide precipitate), respectively. Due to the improved spatial resolution of the on-axis TKD [58][59][60], the oxide precipitates had been well-indexed. At first glance, it would seem that the oxide precipitates examined in this region had no preferred orientation.…”

Section: Crystallographic Analysis By On-axis Tkd (A) Internal Oxide Layermentioning

confidence: 99%

New insights into the oxidation mechanisms of a Ferritic-Martensitic steel in high-temperature steam

Shen

Chen

et al. 2020

Acta Materialia

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The microstructure of the surface oxide film formed on an Fe-9Cr ferritic-martensitic (F-M) steel after exposure to deaerated high-temperature steam at 600 °C for 100 h has been analyzed in detail by advanced characterization techniques. The surface oxide film has been revealed to have a triplex structure, including an outer oxide layer, an inner oxide layer, and an internal oxide layer. Although the outer and inner oxide layers are continuous, the internal oxide layer has been proved to consist of interconnected metallic and chromite phases, which is a typical feature of internal oxidation. The formation mechanisms of each layer have been discussed, finding that, contrary to what the available space model suggests, an external oxidation is not the controlling oxidation mechanism of F-M steels in high-temperature steam. The higher resolution used in this study confirms that the controlling mechanism is internal oxidation.

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“…6b). Since a continuous and compact layer of Cr-rich oxide is critical in protecting the material from further oxidation [13,30,45,46], the grain boundary ahead of the crack tip cannot be effectively protected, resulting in the formation of an IOZ ahead of the crack tips (see Figs. 9 and 10).…”

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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Mechanistic understanding of the temperature dependence of crack growth rate in alloy 600 and 316 stainless steel through high-resolution characterization

Cited by 43 publications

References 47 publications

Observation of internal oxidation in a 20% cold-worked Fe-17Cr-12Ni stainless steel through high-resolution characterization

Observation of internal oxidation in a 20% cold-worked Fe-17Cr-12Ni stainless steel through high-resolution characterization

New insights into the oxidation mechanisms of a Ferritic-Martensitic steel in high-temperature steam

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

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