Transition from internal to surface crack initiation of a single-crystal superalloy in the very-high-cycle fatigue regime at 1100 °C
Transition from internal to surface crack initiation of a single-crystal superalloy in the very-high-cycle fatigue regime at 1100 °C
Transition from internal to surface crack initiation is controlled by oxidation assisted fatigue-crack process in the very-high-cycle fatigue regime. Between 760 and 1000 °C, single crack initiation site is associated with internal casting defect, followed by a crystallographic Stage I propagation. By contrast, multiple surface crack initiation sites appear at 1100 °C, as the consequence of internal oxide penetration. The fatal crack follows a Mode I propagation and oxygen can diffuse into the material along the crack path. γ′-phase depletion appears surrounding the oxidised and cracked regions, while localised rafting can occur close to the crack tip.
Zhao, Z.
3f380b73-f356-4e4c-85c1-b89cd928232c
Li, Q.
60100aaf-efc8-4eab-ba3f-eaf1aa1aca48
Zhang, F.
c4a180cf-a756-453e-b408-339742b91340
Xu, W.
0b662006-ee00-4bd1-897e-471e0cdd977b
Chen, B.
be54a9a8-da2a-4e6f-ae0e-0b076be87daf
28 May 2021
Zhao, Z.
3f380b73-f356-4e4c-85c1-b89cd928232c
Li, Q.
60100aaf-efc8-4eab-ba3f-eaf1aa1aca48
Zhang, F.
c4a180cf-a756-453e-b408-339742b91340
Xu, W.
0b662006-ee00-4bd1-897e-471e0cdd977b
Chen, B.
be54a9a8-da2a-4e6f-ae0e-0b076be87daf
Zhao, Z., Li, Q., Zhang, F., Xu, W. and Chen, B.
(2021)
Transition from internal to surface crack initiation of a single-crystal superalloy in the very-high-cycle fatigue regime at 1100 °C.
International Journal of Fatigue, 150, [106343].
(doi:10.1016/j.ijfatigue.2021.106343).
Abstract
Transition from internal to surface crack initiation is controlled by oxidation assisted fatigue-crack process in the very-high-cycle fatigue regime. Between 760 and 1000 °C, single crack initiation site is associated with internal casting defect, followed by a crystallographic Stage I propagation. By contrast, multiple surface crack initiation sites appear at 1100 °C, as the consequence of internal oxide penetration. The fatal crack follows a Mode I propagation and oxygen can diffuse into the material along the crack path. γ′-phase depletion appears surrounding the oxidised and cracked regions, while localised rafting can occur close to the crack tip.
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Accepted/In Press date: 19 May 2021
e-pub ahead of print date: 24 May 2021
Published date: 28 May 2021
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Local EPrints ID: 489862
URI: http://eprints.soton.ac.uk/id/eprint/489862
ISSN: 0142-1123
PURE UUID: e817b124-2681-45f4-96de-9604d12551ca
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Date deposited: 03 May 2024 16:59
Last modified: 04 May 2024 02:09
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Author:
Z. Zhao
Author:
Q. Li
Author:
F. Zhang
Author:
W. Xu
Author:
B. Chen
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