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
Jiang, R.
25efdc9b-22fb-45a1-a9ab-21618c79b892
Song, Y.D.
ad271204-5d60-40c9-a1a3-bf00f87291d2
Reed, P.A.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
December 2020
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).
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
Text
Fatigue crack growht mechanisms in PM Ni-based superalloys-accepted
- Accepted Manuscript
More information
Accepted/In Press date: 9 August 2020
e-pub ahead of print date: 13 August 2020
Published date: December 2020
Additional Information:
Funding Information:
RJ and YDS would like to thank the National Science and Technology Major Project (2017-VI-0008-0078; 2017-IV-0004-0041), National Natural Science Foundation of China (No. 51805251; 11872204), the Natural Science Foundation of Jiangsu Province (No. BK20180434), Nanjing University of Aeronautics and Astronautics (No. 1002-YAH18002) and Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology (CEPE2018008) for financial support. PAS would like to thank the Engineering and Physical Sciences Research Council (Grant EP/K027271/1; EP/M000710/1) in the UK for financial support. Thanks are also due to Prof. Liguo Zhao at Loughborough University, Dr. Tim Gabb at NASA Glenn Research centre, Dr. Mark Hardy at Rolls-Royce, Dr. Gordon McColvin at GE Power, Dr. Matthew Lunt at Defence Science and Technology Laboratory, Prof. Scott Lockyer and Dr. Katherine Soady at Uniper Technologies Ltd, Prof. Yiwen Zhang and Prof Jiantao Liu at the Central Iron & Steel Research Institute for useful discussions.
Publisher Copyright:
© 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
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Date deposited: 15 Sep 2020 16:33
Last modified: 17 Mar 2024 05:53
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Author:
R. Jiang
Author:
Y.D. Song
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