Correlation between Grain Boundary Migration and Stress Corrosion Cracking of Alloy 600 in Hydrogenated Steam

L. Volpe; M. G. Burke; F. Scenini

doi:10.1016/j.actamat.2020.01.020

Correlation between Grain Boundary Migration and Stress Corrosion Cracking of Alloy 600 in Hydrogenated Steam

L. Volpe, M. G. Burke, F. Scenini

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36 Scopus citations

Abstract

Solution-annealed Alloy 600 samples were tested under active load conditions in a superheated low pressure H₂-steam environment over a range of oxidising potentials relevant to Primary Water Stress Corrosion Cracking (PWSCC). Increased SCC susceptibility was observed for potentials the more reducing than the Ni/NiO transition where a deeper Preferential Intergranular Oxidation (PIO) occurred. Advanced microstructural analysis clearly showed that SCC initiated along the grain boundaries that exhibited Diffusion-Induced Grain Boundary Migration (DIGM), as well as enrichments in Al and Ti. Rather than the result of a single dominant mechanism, the initiation of SCC in Ni-base alloys involves the synergistic interactions between DIGM and the formation of Al- and Ti-enriched oxides, promoting PIO that can fracture with applied stress.

Original language	English
Pages (from-to)	454-466
Number of pages	13
Journal	Acta Materialia
Volume	186
DOIs	https://doi.org/10.1016/j.actamat.2020.01.020
State	Published - Mar 2020
Externally published	Yes

Keywords

AEM
Alloy 600
Diffusion-Induced Grain Boundary Migration
Preferential Intergranular Oxidation
Stress Corrosion Cracking

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10.1016/j.actamat.2020.01.020

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title = "Correlation between Grain Boundary Migration and Stress Corrosion Cracking of Alloy 600 in Hydrogenated Steam",

abstract = "Solution-annealed Alloy 600 samples were tested under active load conditions in a superheated low pressure H2-steam environment over a range of oxidising potentials relevant to Primary Water Stress Corrosion Cracking (PWSCC). Increased SCC susceptibility was observed for potentials the more reducing than the Ni/NiO transition where a deeper Preferential Intergranular Oxidation (PIO) occurred. Advanced microstructural analysis clearly showed that SCC initiated along the grain boundaries that exhibited Diffusion-Induced Grain Boundary Migration (DIGM), as well as enrichments in Al and Ti. Rather than the result of a single dominant mechanism, the initiation of SCC in Ni-base alloys involves the synergistic interactions between DIGM and the formation of Al- and Ti-enriched oxides, promoting PIO that can fracture with applied stress.",

keywords = "AEM, Alloy 600, Diffusion-Induced Grain Boundary Migration, Preferential Intergranular Oxidation, Stress Corrosion Cracking",

author = "L. Volpe and Burke, {M. G.} and F. Scenini",

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year = "2020",

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doi = "10.1016/j.actamat.2020.01.020",

language = "English",

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journal = "Acta Materialia",

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T1 - Correlation between Grain Boundary Migration and Stress Corrosion Cracking of Alloy 600 in Hydrogenated Steam

AU - Volpe, L.

AU - Burke, M. G.

AU - Scenini, F.

PY - 2020/3

Y1 - 2020/3

N2 - Solution-annealed Alloy 600 samples were tested under active load conditions in a superheated low pressure H2-steam environment over a range of oxidising potentials relevant to Primary Water Stress Corrosion Cracking (PWSCC). Increased SCC susceptibility was observed for potentials the more reducing than the Ni/NiO transition where a deeper Preferential Intergranular Oxidation (PIO) occurred. Advanced microstructural analysis clearly showed that SCC initiated along the grain boundaries that exhibited Diffusion-Induced Grain Boundary Migration (DIGM), as well as enrichments in Al and Ti. Rather than the result of a single dominant mechanism, the initiation of SCC in Ni-base alloys involves the synergistic interactions between DIGM and the formation of Al- and Ti-enriched oxides, promoting PIO that can fracture with applied stress.

AB - Solution-annealed Alloy 600 samples were tested under active load conditions in a superheated low pressure H2-steam environment over a range of oxidising potentials relevant to Primary Water Stress Corrosion Cracking (PWSCC). Increased SCC susceptibility was observed for potentials the more reducing than the Ni/NiO transition where a deeper Preferential Intergranular Oxidation (PIO) occurred. Advanced microstructural analysis clearly showed that SCC initiated along the grain boundaries that exhibited Diffusion-Induced Grain Boundary Migration (DIGM), as well as enrichments in Al and Ti. Rather than the result of a single dominant mechanism, the initiation of SCC in Ni-base alloys involves the synergistic interactions between DIGM and the formation of Al- and Ti-enriched oxides, promoting PIO that can fracture with applied stress.

KW - AEM

KW - Alloy 600

KW - Diffusion-Induced Grain Boundary Migration

KW - Preferential Intergranular Oxidation

KW - Stress Corrosion Cracking

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EP - 466

JO - Acta Materialia

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ER -

Correlation between Grain Boundary Migration and Stress Corrosion Cracking of Alloy 600 in Hydrogenated Steam

Abstract

Keywords

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