Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy: stress assisted grain boundary oxidation or dynamic embrittlment?
Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy: stress assisted grain boundary oxidation or dynamic embrittlment?
The role of oxygen in enhanced fatigue cracking in an advanced Ni-based superalloy for turbine disc application has been evaluated in fatigue crack initiation and propagation stages along with static oxidation tests. It is found that the grain boundary oxide intrusion has a layered structure. The microstructure- and deformation-dependent grain boundary oxidation dominates the fatigue crack initiation and early propagation processes. As the crack propagates, this contribution arising from oxidation damage may gradually be overtaken by dynamic embrittlement processes until the mechanical damage outstrips the oxygen-related damage, resulting in a transition from intergranular to transgranular crack propagation.
Dynamic embrittlement, Fatigue crack initiation, Fatigue crack propagation, Ni-based superalloys, Stress assisted grain boundary oxidation
141-154
Jiang, R.
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Proprentner, D.
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Callisti, M.
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Shollock, B.
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Hu, X.T.
a22aee28-2395-4a64-8e84-ad3e96523b58
Song, Y.D.
b2925eb5-6dd5-4970-a36a-8167958c48ba
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
15 July 2018
Jiang, R.
b78f0919-0168-43cd-9cda-dd922d8776bf
Proprentner, D.
cb4b886f-32e2-4c02-8119-75c055a352e9
Callisti, M.
86e03724-aacc-46d5-bccc-4c7025556667
Shollock, B.
c29842be-ea75-47b4-a92d-402486d66331
Hu, X.T.
a22aee28-2395-4a64-8e84-ad3e96523b58
Song, Y.D.
b2925eb5-6dd5-4970-a36a-8167958c48ba
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Jiang, R., Proprentner, D., Callisti, M., Shollock, B., Hu, X.T., Song, Y.D. and Reed, P.A.S.
(2018)
Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy: stress assisted grain boundary oxidation or dynamic embrittlment?
Corrosion Science, 139, .
(doi:10.1016/j.corsci.2018.05.001).
Abstract
The role of oxygen in enhanced fatigue cracking in an advanced Ni-based superalloy for turbine disc application has been evaluated in fatigue crack initiation and propagation stages along with static oxidation tests. It is found that the grain boundary oxide intrusion has a layered structure. The microstructure- and deformation-dependent grain boundary oxidation dominates the fatigue crack initiation and early propagation processes. As the crack propagates, this contribution arising from oxidation damage may gradually be overtaken by dynamic embrittlement processes until the mechanical damage outstrips the oxygen-related damage, resulting in a transition from intergranular to transgranular crack propagation.
Text
Role of oxygen in enhanced fatigue cracking in PM Ni-based superalloys-R2
- Accepted Manuscript
More information
Accepted/In Press date: 2 May 2018
e-pub ahead of print date: 4 May 2018
Published date: 15 July 2018
Keywords:
Dynamic embrittlement, Fatigue crack initiation, Fatigue crack propagation, Ni-based superalloys, Stress assisted grain boundary oxidation
Identifiers
Local EPrints ID: 421789
URI: http://eprints.soton.ac.uk/id/eprint/421789
ISSN: 0010-938X
PURE UUID: 37bb33b4-45c9-4bde-95c7-0414fc905ef4
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Date deposited: 27 Jun 2018 16:30
Last modified: 26 Nov 2021 07:21
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Contributors
Author:
R. Jiang
Author:
D. Proprentner
Author:
M. Callisti
Author:
B. Shollock
Author:
Y.D. Song
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