Effect of sample thinning on strains and lattice rotations measured from Transmission Kikuchi diffraction in the SEM

Karamched, Phani; Saravanan, Naganand; Haley, Jack C.; Wilkinson, Angus J.; Lozano-Pérez, Sergio

doi:10.1016/j.ultramic.2021.113267

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2024

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References 30 publications

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“…GND analysis has the potential of becoming a more reliable technique than DIC and KAM analysis for SCC initiation studies, since it is sensitive to small strain changes and, more importantly, happening in volumes of just a few nanometers. The effect of sample thinning on strain and GND measurements is still under investigation, although preliminary results suggest that both measurements are still fully representative of the bulk sample [51]. These observations support the conclusion that SCC initiation is controlled by local deformation.…”

Section: Discussionmentioning

confidence: 69%

Using local GND density to study SCC initiation

et al. 2020

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Section: Discussionmentioning

confidence: 69%

Using local GND density to study SCC initiation

et al. 2020

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Quantification of SCC mechanisms in austenitic alloys under PWR primary water conditions

Lozano-Perez,

Roberts,

Karamched

et al. 2024

Corrosion Reviews

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In order to achieve a full mechanistic understanding of stress corrosion cracking (SCC), the key operating mechanisms need to be identified but also quantified. In this study, we summarize and rationalize key findings from the last 15 years of high-resolution characterization of SCC in our group. A comprehensive characterization of a set of austenitic alloys with different Ni content and constant Cr level, tested under simulated pressurized water reactor (PWR) primary water conditions at various temperatures, has revealed evidence for at least two operating mechanisms: one diffusion-related and the other deformation-related. For their relevance to the nuclear industry, two additional alloys with increased Cr content were also studied (A800 and A690). Key precursors for SCC initiation and propagation are identified and their effect on alloy degradation discussed. A list of key materials’ properties that ensure low SCC susceptibility is proposed.

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Effect of sample thinning on strains and lattice rotations measured from Transmission Kikuchi diffraction in the SEM

Cited by 2 publications

References 30 publications

Using local GND density to study SCC initiation

Using local GND density to study SCC initiation

Quantification of SCC mechanisms in austenitic alloys under PWR primary water conditions

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