A comparison of high temperature fatigue crack propagation in various sub-solvus heat treated turbine disc alloys
A comparison of high temperature fatigue crack propagation in various sub-solvus heat treated turbine disc alloys
The microstructure and fatigue performance of three sub-solvus heat treated nickel based disc superalloys for turbine disc applications are reported. The alloy variants studied are RR1000, N18 and Udimet 720 Low Interstitial (U720Li), with the latter tested both in a standard and large grain variant (LG). Their microstructures are examined in terms of grain and gamma prime size. Fatigue crack growth (FCG) rates for all materials at 650ºC show that RR1000 provides the best performance, followed by U720Li-LG, N18 and U720Li. In general, the failure modes become increasingly intergranular with increasing ?K. Some of the variations in FCG rate between the alloys are due to reduction in grain boundary oxidation processes with increased grain size, but more subtle interplays between grain boundary character, alloy composition and slip character are also important
N18, U720Li, U720Li-LG, RR1000, nickel superalloy, fatigue crack propagation, turbine disc alloys, mc carbide, creep
1419-1423
Everitt, S.
feb53801-b349-4476-bc9d-a357c352ad10
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Pang, H.T.
021f768b-408c-4a98-b6ae-0c7ae21dd4ce
Wilcock, I.M.
9a9d2435-ab68-4c87-9486-17a549a87a72
Henderson, M.B.
bfe707ae-a07d-4739-9f75-29292f2f46de
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
2007
Everitt, S.
feb53801-b349-4476-bc9d-a357c352ad10
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Pang, H.T.
021f768b-408c-4a98-b6ae-0c7ae21dd4ce
Wilcock, I.M.
9a9d2435-ab68-4c87-9486-17a549a87a72
Henderson, M.B.
bfe707ae-a07d-4739-9f75-29292f2f46de
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Everitt, S., Starink, M.J., Pang, H.T., Wilcock, I.M., Henderson, M.B. and Reed, P.A.S.
(2007)
A comparison of high temperature fatigue crack propagation in various sub-solvus heat treated turbine disc alloys.
Materials Science and Technology, 23, .
(doi:10.1179/174328407X213189).
Abstract
The microstructure and fatigue performance of three sub-solvus heat treated nickel based disc superalloys for turbine disc applications are reported. The alloy variants studied are RR1000, N18 and Udimet 720 Low Interstitial (U720Li), with the latter tested both in a standard and large grain variant (LG). Their microstructures are examined in terms of grain and gamma prime size. Fatigue crack growth (FCG) rates for all materials at 650ºC show that RR1000 provides the best performance, followed by U720Li-LG, N18 and U720Li. In general, the failure modes become increasingly intergranular with increasing ?K. Some of the variations in FCG rate between the alloys are due to reduction in grain boundary oxidation processes with increased grain size, but more subtle interplays between grain boundary character, alloy composition and slip character are also important
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Everitt_et_al_Mater_Sci_Techn_23_2007_1419.pdf
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Published date: 2007
Keywords:
N18, U720Li, U720Li-LG, RR1000, nickel superalloy, fatigue crack propagation, turbine disc alloys, mc carbide, creep
Identifiers
Local EPrints ID: 45815
URI: http://eprints.soton.ac.uk/id/eprint/45815
ISSN: 0267-0836
PURE UUID: 7ab06575-954a-4992-8c6b-0fe88daf4f46
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Date deposited: 12 Apr 2007
Last modified: 16 Mar 2024 02:44
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Contributors
Author:
S. Everitt
Author:
H.T. Pang
Author:
I.M. Wilcock
Author:
M.B. Henderson
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