Influence of orientation-dependent grain boundary oxidation on fatigue cracking behaviour in an advanced Ni-based superalloy
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 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.
4379-4386
Jiang, Rong
b78f0919-0168-43cd-9cda-dd922d8776bf
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
June 2015
Jiang, Rong
b78f0919-0168-43cd-9cda-dd922d8776bf
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Jiang, Rong, Gao, Nong and Reed, Philippa
(2015)
Influence of orientation-dependent grain boundary oxidation on fatigue cracking behaviour in an advanced Ni-based superalloy.
Journal of Materials Science, 50 (12), .
(doi:10.1007/s10853-015-8992-2).
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.
Text
Influence of orientation-dependant grain boundary oxidation on fatigue cracking behaviour in an advanced turbine disc superalloy.pdf
- Accepted Manuscript
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Accepted/In Press date: 25 March 2015
e-pub ahead of print date: 2 April 2015
Published date: June 2015
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 376052
URI: http://eprints.soton.ac.uk/id/eprint/376052
ISSN: 0022-2461
PURE UUID: c4e96514-78b6-4c28-a625-0eb03a49809e
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Date deposited: 23 Apr 2015 15:41
Last modified: 15 Mar 2024 03:10
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Author:
Rong Jiang
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