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High temperature fatigue crack growth in powder processed nickel based superalloy U720Li

High temperature fatigue crack growth in powder processed nickel based superalloy U720Li
High temperature fatigue crack growth in powder processed nickel based superalloy U720Li
Fatigue crack propagation at elevated temperatures (650 and 725°C) has been studied in a powder processed high strength nickel based superalloy, U720Li, in air and vacuum environments, using trapezoidal loading waveforms. Constant load (increasing ?K) tests were used to generate da/dN-?K curves, while interrupted constant ?K tests were used to study crack propagation paths and mechanisms. At 650°C in air there is little effect of any dwell at maximum load while at 725°C such a dwell causes a significant increase in the crack growth rate coupled with a transition from mixed mode to fully intergranular crack growth. In vacuum the growth rates were significantly lower, and the dwell caused little or no change in crack growth rate at 650°C, but an increase at 725°C. The crack path in vacuum changed from fully transgranular at 650°C to incorporate increasingly mixed mode growth at 725°C with dwell. The intergranular failure in vacuum was through creep cavitation of grain boundaries, while in air, static failure of oxygen embrittled boundaries dominated.
0267-0836
349-353
Tucker, A.M.
b77e3e5b-dfc5-47d0-b7d4-cb448bb87c83
Henderson, M.B.
bfe707ae-a07d-4739-9f75-29292f2f46de
Wilkinson, A.J.
8959998d-6769-4e4a-8934-e8a3034abb2a
Hide, N.J.
2dd9a97f-9de4-4d4c-b433-935d5873f8df
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Tucker, A.M.
b77e3e5b-dfc5-47d0-b7d4-cb448bb87c83
Henderson, M.B.
bfe707ae-a07d-4739-9f75-29292f2f46de
Wilkinson, A.J.
8959998d-6769-4e4a-8934-e8a3034abb2a
Hide, N.J.
2dd9a97f-9de4-4d4c-b433-935d5873f8df
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17

Tucker, A.M., Henderson, M.B., Wilkinson, A.J., Hide, N.J. and Reed, P.A.S. (2002) High temperature fatigue crack growth in powder processed nickel based superalloy U720Li. Materials Science and Technology, 18 (3), 349-353. (doi:10.1179/026708302225001840).

Record type: Article

Abstract

Fatigue crack propagation at elevated temperatures (650 and 725°C) has been studied in a powder processed high strength nickel based superalloy, U720Li, in air and vacuum environments, using trapezoidal loading waveforms. Constant load (increasing ?K) tests were used to generate da/dN-?K curves, while interrupted constant ?K tests were used to study crack propagation paths and mechanisms. At 650°C in air there is little effect of any dwell at maximum load while at 725°C such a dwell causes a significant increase in the crack growth rate coupled with a transition from mixed mode to fully intergranular crack growth. In vacuum the growth rates were significantly lower, and the dwell caused little or no change in crack growth rate at 650°C, but an increase at 725°C. The crack path in vacuum changed from fully transgranular at 650°C to incorporate increasingly mixed mode growth at 725°C with dwell. The intergranular failure in vacuum was through creep cavitation of grain boundaries, while in air, static failure of oxygen embrittled boundaries dominated.

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Published date: 2002

Identifiers

Local EPrints ID: 22047
URI: http://eprints.soton.ac.uk/id/eprint/22047
ISSN: 0267-0836
PURE UUID: 42c53f68-bd3a-4ca1-a800-8a73e44d96c5
ORCID for P.A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

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Date deposited: 20 Mar 2006
Last modified: 31 Jul 2019 00:52

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Contributors

Author: A.M. Tucker
Author: M.B. Henderson
Author: A.J. Wilkinson
Author: N.J. Hide
Author: P.A.S. Reed ORCID iD

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