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Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy : stress assisted grain boundary oxidation or dynamic embrittlment?

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Jiang, R., Proprentner, Daniela, Callisti, M., Shollock, Barbara A., Hu, X. T., Song, Y. D. and Reed, P. A. S. (2018) Role of oxygen in enhanced fatigue cracking in a PM Ni-based superalloy : stress assisted grain boundary oxidation or dynamic embrittlment? Corrosion Science, 139 . pp. 141-154. doi:10.1016/j.corsci.2018.05.001

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Official URL: https://doi.org/10.1016/j.corsci.2018.05.001

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Abstract

The role of oxygen in enhanced fatigue cracking in an advanced Ni-based superalloy for turbine disc application has been evaluated in fatigue crack initiation and propagation stages along with static oxidation tests. It is found that the grain boundary oxide intrusion has a layered structure. The microstructure- and deformation-dependent
grain boundary oxidation dominates the fatigue crack initiation and early propagation processes. As the crack propagates, this contribution arising from oxidation damage may gradually be overtaken by dynamic embrittlement processes until the mechanical damage outstrips the oxygen-related damage, resulting in a transition from intergranular to transgranular crack propagation.

Item Type: Journal Article
Subjects: Q Science > Q Science (General)
Divisions: Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Heat resistant alloys -- Oxidation -- Testing, Heat resistant alloys -- Fatigue -- Testing, Fracture mechanics, Airplanes -- Motors
Journal or Publication Title: Corrosion Science
Publisher: Pergamon
ISSN: 0010-938X
Official Date: 15 July 2018
Dates:
DateEvent
15 July 2018Published
4 May 2018Available
2 May 2018Accepted
Volume: 139
Page Range: pp. 141-154
DOI: 10.1016/j.corsci.2018.05.001
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/K027271/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
1002-YAH18002Nanjing University of Aeronautics and Astronauticshttp://dx.doi.org/10.13039/501100004193
113072Innovate UKhttp://dx.doi.org/10.13039/501100006041

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