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, 1419-1423.

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Description/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 ΔK. 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

Item Type: Article
ISSNs: 0267-0836 (print)
Related URLs:
Keywords: N18, U720Li, U720Li-LG, RR1000, nickel superalloy, fatigue crack propagation, turbine disc alloys, mc carbide, creep
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 45815
Date Deposited: 12 Apr 2007
Last Modified: 27 Mar 2014 18:30
URI: http://eprints.soton.ac.uk/id/eprint/45815

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