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

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 t...

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Bibliographic Details
Published in:Journal of materials science 2015-06, Vol.50 (12), p.4379-4386
Main Authors: Jiang, R., Gao, N., Reed, P. A. S.
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Bulging
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crack initiation
Crack propagation
Crystallography and Scattering Methods
Fatigue
Fatigue cracking
Fatigue cracks
Fatigue failure
Fatigue testing machines
Fatigue tests
Fracture mechanics
Grain boundaries
Materials
Materials Science
Nickel
Nickel base alloys
Original Paper
Oxidation
Oxidation-reduction reaction
Oxides
Polymer Sciences
Refractory materials
Solid Mechanics
Superalloys
Tensile stress
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-8992-2