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Journal of Materials Science
Erschienen in: Journal of Materials Science 12/2015

01.06.2015 | Original Paper

Influence of orientation-dependent grain boundary oxidation on fatigue cracking behaviour in an advanced Ni-based superalloy

verfasst von: R. Jiang, N. Gao, P. A. S. Reed

Erschienen in: Journal of Materials Science | Ausgabe 12/2015

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Abstract

Fatigue tests have been conducted on an advanced disc Ni-based superalloy [low solvus, high refractory (LSHR) alloy] at 650 °C in air under three-point bend loading to investigate the role of orientation-dependent grain boundary (GB) oxidation in crack initiation and early propagation. It is found that crack initiation occurs mainly from bulged GB oxides, and cracks then predominantly propagate along the oxidised grain boundaries. These bulged oxides are extremely enriched in Co and preferentially form at the boundaries between high and low Schmid factor grains which are inclined normal to the applied tensile stress direction. Meanwhile, relatively flat/thin Ni/Ti/Al-rich oxide complexes also form at other grain boundaries, but they appear to be much less detrimental in fatigue crack initiation and propagation compared with the bulged GB Co-rich oxide complexes.
Vorheriger Artikel Dynamic rheological property and membrane formation of mechanochemically modified polyvinylchloride
Nächster Artikel High-efficiency grafting of halloysite nanotubes by using π-conjugated polyfluorenes via “click” chemistry

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Metadaten
Titel
Influence of orientation-dependent grain boundary oxidation on fatigue cracking behaviour in an advanced Ni-based superalloy
verfasst von
R. Jiang
N. Gao
P. A. S. Reed
Publikationsdatum
01.06.2015
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 12/2015
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-015-8992-2

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