Control of fatigue failure mechanisms in multilayer coatings by varying the architectural parameters of an intermetallic interlayer
Control of fatigue failure mechanisms in multilayer coatings by varying the architectural parameters of an intermetallic interlayer
A multilayer overlay coating system containing an intermediate intermetallic layer is an architecture expected to show good fatigue resistance. Experimental characterization and modeling simulations were carried out to classify the different crack initiation mechanisms occurring during fatigue of this coating system (2IML coating system) and to reveal how changes in the layer architecture lead to fatigue improvement. Surface crack initiation seems to play the dominated role in the fatigue failure of this coating system as over 55% of observed cracks were surface cracks. Fatigue improvement is achieved by increasing surface initiation resistance via decreasing the IML-Top layer thickness. However, subsurface initiation mechanisms inhibit the improvement (dominated by surface initiation mechanism) achieved by locating the IML-Top layer closer to the top surface. Optimizing the design of 2IML multilayer coatings based on the fatigue performance should eliminate the unreacted nickel layer in the intermediate IML-Top layer, increase the subsurface interface strength, and decrease the density of voids occurring in the annealing process.
1035-1051
Lu, Songsong
179a342f-28f8-4181-8767-f5be79806578
Cook, Richard
b14975ee-e08c-40a9-8dd0-f8ed2c1a799b
Zhang, Yi
21f65196-cfd6-475b-aa46-888cd47a241d
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
12 January 2022
Lu, Songsong
179a342f-28f8-4181-8767-f5be79806578
Cook, Richard
b14975ee-e08c-40a9-8dd0-f8ed2c1a799b
Zhang, Yi
21f65196-cfd6-475b-aa46-888cd47a241d
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Lu, Songsong, Cook, Richard, Zhang, Yi and Reed, Philippa
(2022)
Control of fatigue failure mechanisms in multilayer coatings by varying the architectural parameters of an intermetallic interlayer.
Fatigue & Fracture of Engineering Materials & Structures, 45 (4), .
(doi:10.1111/ffe.13649).
Abstract
A multilayer overlay coating system containing an intermediate intermetallic layer is an architecture expected to show good fatigue resistance. Experimental characterization and modeling simulations were carried out to classify the different crack initiation mechanisms occurring during fatigue of this coating system (2IML coating system) and to reveal how changes in the layer architecture lead to fatigue improvement. Surface crack initiation seems to play the dominated role in the fatigue failure of this coating system as over 55% of observed cracks were surface cracks. Fatigue improvement is achieved by increasing surface initiation resistance via decreasing the IML-Top layer thickness. However, subsurface initiation mechanisms inhibit the improvement (dominated by surface initiation mechanism) achieved by locating the IML-Top layer closer to the top surface. Optimizing the design of 2IML multilayer coatings based on the fatigue performance should eliminate the unreacted nickel layer in the intermediate IML-Top layer, increase the subsurface interface strength, and decrease the density of voids occurring in the annealing process.
Text
Fatigue Fract Eng Mat Struct - 2022 - Lu - Control of fatigue failure mechanisms in multilayer coatings by varying the
- Version of Record
More information
Accepted/In Press date: 29 December 2021
Published date: 12 January 2022
Identifiers
Local EPrints ID: 486322
URI: http://eprints.soton.ac.uk/id/eprint/486322
ISSN: 8756-758X
PURE UUID: 575eda12-e59e-4e62-bc22-f60c0726fe14
Catalogue record
Date deposited: 17 Jan 2024 19:37
Last modified: 18 Mar 2024 02:39
Export record
Altmetrics
Contributors
Author:
Songsong Lu
Author:
Richard Cook
Author:
Yi Zhang
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
