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Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review

Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review
Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review
Powder metallurgy (PM) Ni-based superalloys are widely used for aeroengine turbine disc applications due to their excellent mechanical properties and good corrosion resistance at elevated temperatures. Understanding the fatigue crack growth (FCG) mechanisms of PM Ni-based superalloys is important for both disc alloy development and life prediction of disc components in these advanced aeroengines where damage tolerance design prevails. FCG in PM Ni-based superalloys is a complicated function of microstructure, temperature, loading conditions and environment and is usually a consequence of the synergistic effects of fatigue, creep and environmental damage. In this review, the mechanisms controlled by microstructural features including grain size, grain misorientation, γ′ size and distribution on short and long FCG behaviour in PM Ni-based superalloys are discussed. The contribution of creep and environmental damage to FCG has been critically assessed. The competing effects of mechanical damage (i.e. fatigue and creep) and environmental damage at the crack tip are microstructure-sensitive, and usually results in transition between transgranular, mixed-trans-intergranular and intergranular FCG depending on the contribution of environmental damage to FCG processes
PM Ni-based superalloys;, creep, environmental damage;, fatigue crack growth, microstructures
0142-1123
Jiang, R.
25efdc9b-22fb-45a1-a9ab-21618c79b892
Song, Y.D.
ad271204-5d60-40c9-a1a3-bf00f87291d2
Reed, P.A.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Jiang, R.
25efdc9b-22fb-45a1-a9ab-21618c79b892
Song, Y.D.
ad271204-5d60-40c9-a1a3-bf00f87291d2
Reed, P.A.
8b79d87f-3288-4167-bcfc-c1de4b93ce17

Jiang, R., Song, Y.D. and Reed, P.A. (2020) Fatigue crack growth mechanisms in powder metallurgy Ni-based superalloys—A review. International Journal of Fatigue, 141, [105887]. (doi:10.1016/j.ijfatigue.2020.105887).

Record type: Article

Abstract

Powder metallurgy (PM) Ni-based superalloys are widely used for aeroengine turbine disc applications due to their excellent mechanical properties and good corrosion resistance at elevated temperatures. Understanding the fatigue crack growth (FCG) mechanisms of PM Ni-based superalloys is important for both disc alloy development and life prediction of disc components in these advanced aeroengines where damage tolerance design prevails. FCG in PM Ni-based superalloys is a complicated function of microstructure, temperature, loading conditions and environment and is usually a consequence of the synergistic effects of fatigue, creep and environmental damage. In this review, the mechanisms controlled by microstructural features including grain size, grain misorientation, γ′ size and distribution on short and long FCG behaviour in PM Ni-based superalloys are discussed. The contribution of creep and environmental damage to FCG has been critically assessed. The competing effects of mechanical damage (i.e. fatigue and creep) and environmental damage at the crack tip are microstructure-sensitive, and usually results in transition between transgranular, mixed-trans-intergranular and intergranular FCG depending on the contribution of environmental damage to FCG processes

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Fatigue crack growht mechanisms in PM Ni-based superalloys-accepted - Accepted Manuscript
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Accepted/In Press date: 9 August 2020
e-pub ahead of print date: 13 August 2020
Keywords: PM Ni-based superalloys;, creep, environmental damage;, fatigue crack growth, microstructures

Identifiers

Local EPrints ID: 443869
URI: http://eprints.soton.ac.uk/id/eprint/443869
ISSN: 0142-1123
PURE UUID: 44ec755d-36a9-473f-a296-8f77c0d9d4ca
ORCID for P.A. Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 15 Sep 2020 16:33
Last modified: 26 Nov 2021 06:35

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Contributors

Author: R. Jiang
Author: Y.D. Song
Author: P.A. Reed ORCID iD

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