Date
2022-01-08Subject
600 Technology 660 Chemical engineering VerbindungsschichtBruchzähigkeitIntermetallische VerbindungenBiegungThermomechanische EigenschaftMetadata
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Aufsatz
Microcantilever Fracture Tests of α-Cr Containing NiAl Bond Coats
Abstract
MCrAlY bond coats are widely used as oxidation-resistant coatings on superalloys. The major phase is the thermally stable intermetallic β-NiAl phase. The addition of Cr increases the oxidation and corrosion resistance but leads to the formation of α-Cr precipitates. Both phases are brittle and limit the fracture toughness of these coatings. To study the influence of thermal exposure and the resulting changing chemical composition on the fracture properties, the fracture toughness of both phases is measured by notched microcantilever bending, after processing and after oxidation by thermal cycling. The fracture toughness of β-NiAl decreases during thermal cycling due to the depletion in Al, whereas the fracture toughness and the composition of α-Cr stay constant. As the fracture toughness of α-Cr is lower compared with β-NiAl, the formation of α-Cr precipitates is supposed to decrease the fracture toughness of the bond coat.
Citation
In: Advanced Engineering Materials Volume 24 / Issue 7 (2022-01-08) eissn:1527-2648Sponsorship
H2020 European Research Council. Grant Numbers: 725483, 949626; Open access funding enabled and organized by Projekt DEALCitation
@article{doi:10.17170/kobra-202308048576,
author={Gabel, Stefan and Giese, Sven and Webler, Ralf Uwe and Neumeier, Steffen and Göken, Mathias},
title={Microcantilever Fracture Tests of α-Cr Containing NiAl Bond Coats},
journal={Advanced Engineering Materials},
year={2022}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2022$n2022 1500 1/eng 2050 ##0##http://hdl.handle.net/123456789/14975 3000 Gabel, Stefan 3010 Giese, Sven 3010 Webler, Ralf Uwe 3010 Neumeier, Steffen 3010 Göken, Mathias 4000 Microcantilever Fracture Tests of α-Cr Containing NiAl Bond Coats / Gabel, Stefan 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/http://hdl.handle.net/123456789/14975=x R 4204 \$dAufsatz 4170 5550 {{Verbindungsschicht}} 5550 {{Bruchzähigkeit}} 5550 {{Intermetallische Verbindungen}} 5550 {{Biegung}} 5550 {{Thermomechanische Eigenschaft}} 7136 ##0##http://hdl.handle.net/123456789/14975
2023-08-08T07:55:24Z 2023-08-08T07:55:24Z 2022-01-08 doi:10.17170/kobra-202308048576 http://hdl.handle.net/123456789/14975 H2020 European Research Council. Grant Numbers: 725483, 949626; Open access funding enabled and organized by Projekt DEAL eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ bond coats fracture toughnesses intermetallics microcantilever bending 600 660 Microcantilever Fracture Tests of α-Cr Containing NiAl Bond Coats Aufsatz MCrAlY bond coats are widely used as oxidation-resistant coatings on superalloys. The major phase is the thermally stable intermetallic β-NiAl phase. The addition of Cr increases the oxidation and corrosion resistance but leads to the formation of α-Cr precipitates. Both phases are brittle and limit the fracture toughness of these coatings. To study the influence of thermal exposure and the resulting changing chemical composition on the fracture properties, the fracture toughness of both phases is measured by notched microcantilever bending, after processing and after oxidation by thermal cycling. The fracture toughness of β-NiAl decreases during thermal cycling due to the depletion in Al, whereas the fracture toughness and the composition of α-Cr stay constant. As the fracture toughness of α-Cr is lower compared with β-NiAl, the formation of α-Cr precipitates is supposed to decrease the fracture toughness of the bond coat. open access Gabel, Stefan Giese, Sven Webler, Ralf Uwe Neumeier, Steffen Göken, Mathias doi:10.1002/adem.202101429 725483, 949626 Verbindungsschicht Bruchzähigkeit Intermetallische Verbindungen Biegung Thermomechanische Eigenschaft publishedVersion eissn:1527-2648 Issue 7 Advanced Engineering Materials Volume 24 false 2101429
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