Oxidation induced crack closure in a nickel base superalloy: a novel phenomenon and mechanism assessed via combination of 2D and 3D characterization
Oxidation induced crack closure in a nickel base superalloy: a novel phenomenon and mechanism assessed via combination of 2D and 3D characterization
Understanding the mechanism of oxidation induced crack closure (OICC) is of great importance in understanding the fatigue resistance of materials operating at intermediate or high temperatures subjected to oxidation. Current work reveals that the occurrence of OICC is most closely related to the test frequencies and temperatures rather than the microstructure in a directionally solidified (DS) superalloy. Characterization techniques in three dimensions - X-ray scanning tomography (CT) and two dimensions - scanning electron microscopy (SEM) with attached energy-dispersive Xray spectroscopy (EDX) are combined to capture the oxides formed within the crack wake. These data are then incorporated into modified models to provide quantitative measurements of oxidation induced crack closure. Both the experimental and modelling results show that the external oxides forming close to the crack tip, result in a high crack tip opening displacement and thereby significant crack closure.
Tan, Yuanguo
604fb4b1-5af5-4adb-af9b-76d605852546
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
19 November 2022
Tan, Yuanguo
604fb4b1-5af5-4adb-af9b-76d605852546
Gao, Nong
9c1370f7-f4a9-4109-8a3a-4089b3baec21
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Tan, Yuanguo, Gao, Nong and Reed, Philippa
(2022)
Oxidation induced crack closure in a nickel base superalloy: a novel phenomenon and mechanism assessed via combination of 2D and 3D characterization.
Materials Science and Engineering: A, 861.
(doi:10.1016/j.msea.2022.144311).
Abstract
Understanding the mechanism of oxidation induced crack closure (OICC) is of great importance in understanding the fatigue resistance of materials operating at intermediate or high temperatures subjected to oxidation. Current work reveals that the occurrence of OICC is most closely related to the test frequencies and temperatures rather than the microstructure in a directionally solidified (DS) superalloy. Characterization techniques in three dimensions - X-ray scanning tomography (CT) and two dimensions - scanning electron microscopy (SEM) with attached energy-dispersive Xray spectroscopy (EDX) are combined to capture the oxides formed within the crack wake. These data are then incorporated into modified models to provide quantitative measurements of oxidation induced crack closure. Both the experimental and modelling results show that the external oxides forming close to the crack tip, result in a high crack tip opening displacement and thereby significant crack closure.
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2nd clean version of the paper
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Accepted/In Press date: 6 November 2022
e-pub ahead of print date: 14 November 2022
Published date: 19 November 2022
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Local EPrints ID: 475939
URI: http://eprints.soton.ac.uk/id/eprint/475939
ISSN: 0921-5093
PURE UUID: 85c2df11-f7f8-4b5f-8326-daf54c530cea
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Date deposited: 31 Mar 2023 16:42
Last modified: 17 Mar 2024 07:41
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Author:
Yuanguo Tan
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