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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?
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
0010-938X
141-154
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.
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, 141-154. (doi:10.1016/j.corsci.2018.05.001).

Record type: Article

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.

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Role of oxygen in enhanced fatigue cracking in PM Ni-based superalloys-R2 - Accepted Manuscript
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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
ORCID for P.A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

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Date deposited: 27 Jun 2018 16:30
Last modified: 07 Oct 2020 06:43

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Contributors

Author: R. Jiang
Author: D. Proprentner
Author: M. Callisti
Author: B. Shollock
Author: X.T. Hu
Author: Y.D. Song
Author: P.A.S. Reed ORCID iD

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