Temperature and dwell dependence of fatigue crack propagation in various heat treated turbine disc alloys
Temperature and dwell dependence of fatigue crack propagation in various heat treated turbine disc alloys
Four turbine disc alloys: N18, U720Li (in two grain sizes) and RR1000 are compared in terms of crack propagation behaviour at 650?C and 725?C in air and vacuum under 1-1-1-1 and 1-20-1-1 trapezoidal loading. Fractographic analysis, together with crack propagation analysis under the varying test conditions has been combined with a novel apparent activation energy analysis approach, to assess the multi-mechanistic processes operating. Oxidation fatigue seems to be the dominant time-dependent process while the best oxidation resistance appears to be shown by RR1000. A larger grain size confers a benefit for crack growth behaviour in time-dependent fatigue (in the absence of other factors). The grain boundary character of RR1000 and N18 is deduced to play an important role in their improved high temperature fatigue crack growth resistance over the U720Li variants.
Fatigue Crack Propagation, Apparent Activation Energy, N18, U720Li, U720Li(LG), RR1000, turbine disc, superalloy, nickel alloy, oxidation
741 -750
The Minerals, Metals and Materials Society
Everitt, S.
feb53801-b349-4476-bc9d-a357c352ad10
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
2008
Everitt, S.
feb53801-b349-4476-bc9d-a357c352ad10
Starink, M.J.
fe61a323-4e0c-49c7-91f0-4450e1ec1e51
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Everitt, S., Starink, M.J. and Reed, P.A.S.
(2008)
Temperature and dwell dependence of fatigue crack propagation in various heat treated turbine disc alloys.
In Superalloys 2008.
The Minerals, Metals and Materials Society.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Four turbine disc alloys: N18, U720Li (in two grain sizes) and RR1000 are compared in terms of crack propagation behaviour at 650?C and 725?C in air and vacuum under 1-1-1-1 and 1-20-1-1 trapezoidal loading. Fractographic analysis, together with crack propagation analysis under the varying test conditions has been combined with a novel apparent activation energy analysis approach, to assess the multi-mechanistic processes operating. Oxidation fatigue seems to be the dominant time-dependent process while the best oxidation resistance appears to be shown by RR1000. A larger grain size confers a benefit for crack growth behaviour in time-dependent fatigue (in the absence of other factors). The grain boundary character of RR1000 and N18 is deduced to play an important role in their improved high temperature fatigue crack growth resistance over the U720Li variants.
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Published date: 2008
Venue - Dates:
11th International Symposium on Superalloys (Superalloys 2008), Champion, USA, 2008-09-13 - 2008-09-17
Keywords:
Fatigue Crack Propagation, Apparent Activation Energy, N18, U720Li, U720Li(LG), RR1000, turbine disc, superalloy, nickel alloy, oxidation
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 52076
URI: http://eprints.soton.ac.uk/id/eprint/52076
PURE UUID: d3c51b70-559d-4b54-8e1d-949b15bad3ea
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Date deposited: 17 Jun 2008
Last modified: 09 Jan 2022 02:44
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Author:
S. Everitt
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