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Intergranular crack tip oxidation in a Ni-base superalloy

Abstract:

High-temperature intergranular crack tip oxidation under a single 600 s long sustained tensile load at 700 °C was studied for the Ni-base superalloy Allvac 718Plus. High-resolution analytical techniques showed oxidation to take place at and immediately ahead of the tip of an open crack, forming a closed but layered oxide structure about the prior (now oxidized) grain boundary. Near the prior grain boundary the oxide is Ni-rich, with a Co-enriched layer furthest away from the metal and a Fe-en...

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Authors


Viskari, L More by this author
Hörnqvist, M More by this author
Stiller, K More by this author
More by this author
Institution:
University of Oxford
Department:
Oxford, MPLS, Materials
Journal:
Acta Materialia
Volume:
61
Issue:
10
Pages:
3630-3639
Publication date:
2013-06-05
DOI:
ISSN:
1359-6454
URN:
uuid:7d3e9062-595d-4ad3-a33d-c2b44c2dc281
Source identifiers:
403636
Local pid:
pubs:403636

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