Critical assessment 21: oxygen-assisted fatigue crack propagation in turbine disc superalloys
Critical assessment 21: oxygen-assisted fatigue crack propagation in turbine disc superalloys
Ni-based superalloys in turbine disc applications face increasing susceptibility to oxygen-assisted fatigue crack propagation due to increased turbine entry temperatures. The continued lack of understanding of the interplay between the factors operating during oxygen-assisted fatigue crack propagation limits: (1) development of lifing methodologies to accurately predict the fatigue performance of disc alloys/components and (2) associated disc alloy developments. An underpinning requirement to better understand the role of oxygen is to characterise the process of oxygen diffusion in the localised stress/strain state at the crack tip, which is related closely to microstructural features. The link between three-dimensional crack tomography, crack propagation rate and oxygen-related attack needs to be established. Quantitative models which include the interaction between fatigue–creep–oxygen attack need further development.
Ni-based superalloys, oxidation, dynamic embrittlement, crack tip, localised deformation
401-406
Jiang, R.
b78f0919-0168-43cd-9cda-dd922d8776bf
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Jiang, R.
b78f0919-0168-43cd-9cda-dd922d8776bf
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Jiang, R. and Reed, P.A.S.
(2016)
Critical assessment 21: oxygen-assisted fatigue crack propagation in turbine disc superalloys.
Materials Science and Technology, 32 (5), .
(doi:10.1080/02670836.2016.1148227).
Abstract
Ni-based superalloys in turbine disc applications face increasing susceptibility to oxygen-assisted fatigue crack propagation due to increased turbine entry temperatures. The continued lack of understanding of the interplay between the factors operating during oxygen-assisted fatigue crack propagation limits: (1) development of lifing methodologies to accurately predict the fatigue performance of disc alloys/components and (2) associated disc alloy developments. An underpinning requirement to better understand the role of oxygen is to characterise the process of oxygen diffusion in the localised stress/strain state at the crack tip, which is related closely to microstructural features. The link between three-dimensional crack tomography, crack propagation rate and oxygen-related attack needs to be established. Quantitative models which include the interaction between fatigue–creep–oxygen attack need further development.
Text
Author copy Critical assessment-fatigue-oxidation failure in turbine disc superalloys.pdf
- Accepted Manuscript
More information
Accepted/In Press date: 27 January 2016
e-pub ahead of print date: 21 April 2016
Keywords:
Ni-based superalloys, oxidation, dynamic embrittlement, crack tip, localised deformation
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 393207
URI: http://eprints.soton.ac.uk/id/eprint/393207
ISSN: 0267-0836
PURE UUID: 95eac1a3-23ed-4c6d-a848-75a11b6a32c6
Catalogue record
Date deposited: 22 Apr 2016 12:44
Last modified: 15 Mar 2024 05:31
Export record
Altmetrics
Contributors
Author:
R. Jiang
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
