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

Volpe, L.; Burke, M.G.; Scenini, Fabio

doi:10.1016/j.actamat.2019.06.021

Cited by 45 publications

(39 citation statements)

References 37 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%

“…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].…”

Section: Comparison Between Surface and Crack Tip Oxidationsupporting

confidence: 71%

“…Since the signal intensity of Ni in the Ni-rich zone is greater than the unaffected matrix, it suggests that Ni expulsion has occurred in this region. The formation of this Ni-rich zone has been reported to be due to grain boundary migration [13,19,20,24].…”

Section: Intragranular Oxidationmentioning

confidence: 97%

“…Thereafter, despite the fact that a large number of laboratory studies have been performed and several possible models proposed to explain the IGSCC phenomenon [2][3][4][5][6], the exact failure mechanisms driving IGSCC propagation remain unclear. To date, plenty of parameters have been reported to have influence on SCC, including temperature, alloy composition, cold-work, electrochemical potential, and stress [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The problem is further convoluted as the parameters listed above are not independent.…”

Section: Introductionmentioning

confidence: 99%

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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: Intragranular Oxidationmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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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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“…On the other hand, recent investigations reported that tensile RS has no direct effect on SCC of ASS made by manufacturing methods such as hot or cold rolling and it only makes the surface more active compared to annealed specimens. This higher activity results in a more favorable initiation of corrosion pits on the surface that could act as stress concentration sites and precursors for SCC initiation under working loads [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Stress Corrosion Cracking Probability of Selective Laser Melted 316L Austenitic Stainless Steel under the Effect of Grinding Induced Residual Stresses

Yazdanpanah

Lago

Gennari

et al. 2021

Metals

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Surface quality and dimensional tolerances of the selective laser melting (SLM) process are not good enough for many industrial applications and grinding as a common finishing process introduces many surface modifications. Investigation on the effect of grinding induced surface residual stress (RS) on early stages of stress corrosion cracking (SCC) of SLM manufactured 316L austenitic stainless steel was conducted. Potentiodynamic and galvanostatic tests in a 3.5% NaCl aqueous solution, XRD, SEM and energy-dispersive X-ray spectroscopy (EDX) analysis were performed. For annealed and specimens with a low RS magnitude, the dominant observation was pit initiation from existing pores and growth in the build direction. For specimens with medium RS level, SCC initiation from pore sites and propagation along melt pool boundaries and for specimens with the highest detected RS, crack initiation from melt pool boundaries, grains, machining marks, and pore sites were observed. Cracks propagated in different directions, i.e., along melt pool boundaries, near-surface transgranular, and transgranular through columnar microstructure. Galvanostatic tests showed three distinctive regions that corresponded to crack and pit initiation and growth. The synergistic effect of high dislocation density along melt pool boundaries, stress concentration in pore sites, molybdenum segregation, and surface RS was the cause of SCC susceptibility of specimens with high RS magnitude.

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Internal Oxidation of a Fe–Cr Binary Alloy at 700–900 °C: The Role of Hydrogen and Water Vapor

et al. 2022

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Internal oxidation of Fe–2.25Cr has been studied in Fe/FeO Rhines pack (RP) and H2/H2O gas mixtures at 700–900 °C. A novel exposure technique allowing RP experiments in dual atmosphere conditions was developed. No measurable effect of hydrogen on lattice oxygen permeability in ferrite could be detected: neither in single nor in dual atmosphere conditions. The H2/H2O atmosphere was found to induce stronger oxidation attack at alloy grain boundaries resulting in a morphology similar to intergranular stress corrosion cracking often reported in nuclear technology. The intergranular oxidation attack was demonstrated to be independent of the dual atmosphere effect, i.e., hydrogen dissolved in the alloy.

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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

Cited by 45 publications

References 37 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

Stress Corrosion Cracking Probability of Selective Laser Melted 316L Austenitic Stainless Steel under the Effect of Grinding Induced Residual Stresses

Internal Oxidation of a Fe–Cr Binary Alloy at 700–900 °C: The Role of Hydrogen and Water Vapor

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