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A comparison of high temperature fatigue crack propagation in various sub-solvus heat treated turbine disc alloys

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, pp. 1419-1423. (doi:10.1179/174328407X213189).

Record type: Article


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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Published date: 2007
Keywords: N18, U720Li, U720Li-LG, RR1000, nickel superalloy, fatigue crack propagation, turbine disc alloys, mc carbide, creep


Local EPrints ID: 45815
ISSN: 0267-0836
PURE UUID: 7ab06575-954a-4992-8c6b-0fe88daf4f46
ORCID for P.A.S. Reed: ORCID iD

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Date deposited: 12 Apr 2007
Last modified: 17 Jul 2017 15:11

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Author: S. Everitt
Author: M.J. Starink
Author: H.T. Pang
Author: I.M. Wilcock
Author: M.B. Henderson
Author: P.A.S. Reed ORCID iD

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