Fatigue crack initiation and short crack growth in nickel-base turbine disc alloys—the effects of microstructure and operating parameters
Fatigue crack initiation and short crack growth in nickel-base turbine disc alloys—the effects of microstructure and operating parameters
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.
RR1000, udimet 720Li, microstructural effects, fatigue crack initiation, short crack growth
1089-1099
Pang, H.T.
021f768b-408c-4a98-b6ae-0c7ae21dd4ce
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
2003
Pang, H.T.
021f768b-408c-4a98-b6ae-0c7ae21dd4ce
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
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), .
(doi:10.1016/S0142-1123(03)00146-4).
Abstract
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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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
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Date deposited: 22 Mar 2006
Last modified: 16 Mar 2024 02:44
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Author:
H.T. Pang
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