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Fatigue crack initiation and short crack growth in nickel-base turbine disc alloys—the effects of microstructure and operating parameters

Record type: Article

An assessment of the effects of microstructure and operating parameters on both crack initiation and propagation of short fatigue cracks is presented. The assessment was carried out on RR1000, U720Li and microstructural variants of U720Li. Fatigue tests were carried out at room temperature (20 Hz sinusoidal cycling) and at 650 °C (1–1–1–1 trapezoidal cycling). Comparisons of the performance of the different microstructures revealed that initiation occurred predominantly at pores at both temperatures. At room temperature, stage I crack growth predominated and the presence of large primary ?? precipitates on the grain boundaries, larger grains and larger coherent ?? sizes gave improved fatigue crack growth resistance, whereas at 650 °C, larger grains gave the most significant performance benefits.

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Citation

Pang, H.T. and Reed, P.A.S. (2003) Fatigue crack initiation and short crack growth in nickel-base turbine disc alloys—the effects of microstructure and operating parameters International Journal of Fatigue, 25, (9-11), pp. 1089-1099. (doi:10.1016/S0142-1123(03)00146-4).

More information

Published date: 2003
Additional Information: International Conference on Fatigue Damage of Structural Materials IV
Keywords: RR1000, udimet 720Li, microstructural effects, fatigue crack initiation, short crack growth

Identifiers

Local EPrints ID: 22425
URI: http://eprints.soton.ac.uk/id/eprint/22425
ISSN: 0142-1123
PURE UUID: f2ff1a41-a6a2-413e-8888-df92c6692a26
ORCID for P.A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 22 Mar 2006
Last modified: 17 Jul 2017 16:22

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