On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys

A. A.N. Németh; D. M. Collins; D. J. Crudden; V. Kuksenko; C. H. Liebscher; D. E.J. Armstrong; A. J. Wilkinson; R. C. Reed

doi:10.1007/s11661-018-4619-y

On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys

A. A.N. Németh, D. M. Collins, D. J. Crudden, V. Kuksenko, C. H. Liebscher, D. E.J. Armstrong, A. J. Wilkinson, R. C. Reed^*

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

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Abstract

The effect of Nb/Ti ratio on environmentally-assisted crack growth of three prototype Ni-based superalloys is studied. For these alloys, the yield strength is unaltered with increasing Nb/Ti ratio due to an increase in grain size. This situation has allowed the rationalization of the factors influencing damage tolerance at 700 °C. Primary intergranular cracks have been investigated using energy-dispersive X-ray spectroscopy in a scanning transmission electron microscope and the analysis of electron back-scatter diffraction patterns. Any possible detrimental effect of Nb on the observed crack tip damage due to Nb-rich oxide formation is not observed. Instead, evidence is presented to indicate that the tertiary γ′-precipitates are dissolving ahead of the crack consistent with the formation of oxides such as alumina and rutile. Our results have implications for alloy design efforts; at any given strength level, both more and less damage-tolerant variants of these alloys can be designed.

Original language	English
Pages (from-to)	1-15
Number of pages	15
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Early online date	11 May 2018
DOIs	https://doi.org/10.1007/s11661-018-4619-y
Publication status	E-pub ahead of print - 11 May 2018

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys

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Published as above, final version of record for Németh, A.A.N., Crudden, D.J., Collins, D.M. et al. Metall and Mat Trans A (2018) available at: https://doi.org/10.1007/s11661-018-4619-y. Checked 24/5/18.
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Németh, A. A. N., Collins, D. M., Crudden, D. J., Kuksenko, V., Liebscher, C. H., Armstrong, D. E. J., Wilkinson, A. J., & Reed, R. C. (2018). On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 1-15. https://doi.org/10.1007/s11661-018-4619-y

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title = "On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys",

abstract = "The effect of Nb/Ti ratio on environmentally-assisted crack growth of three prototype Ni-based superalloys is studied. For these alloys, the yield strength is unaltered with increasing Nb/Ti ratio due to an increase in grain size. This situation has allowed the rationalization of the factors influencing damage tolerance at 700 °C. Primary intergranular cracks have been investigated using energy-dispersive X-ray spectroscopy in a scanning transmission electron microscope and the analysis of electron back-scatter diffraction patterns. Any possible detrimental effect of Nb on the observed crack tip damage due to Nb-rich oxide formation is not observed. Instead, evidence is presented to indicate that the tertiary γ′-precipitates are dissolving ahead of the crack consistent with the formation of oxides such as alumina and rutile. Our results have implications for alloy design efforts; at any given strength level, both more and less damage-tolerant variants of these alloys can be designed.",

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Németh, AAN, Collins, DM, Crudden, DJ, Kuksenko, V, Liebscher, CH, Armstrong, DEJ, Wilkinson, AJ & Reed, RC 2018, 'On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys', Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, pp. 1-15. https://doi.org/10.1007/s11661-018-4619-y

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AU - Németh, A. A.N.

AU - Collins, D. M.

AU - Crudden, D. J.

AU - Kuksenko, V.

AU - Liebscher, C. H.

AU - Armstrong, D. E.J.

AU - Wilkinson, A. J.

AU - Reed, R. C.

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N2 - The effect of Nb/Ti ratio on environmentally-assisted crack growth of three prototype Ni-based superalloys is studied. For these alloys, the yield strength is unaltered with increasing Nb/Ti ratio due to an increase in grain size. This situation has allowed the rationalization of the factors influencing damage tolerance at 700 °C. Primary intergranular cracks have been investigated using energy-dispersive X-ray spectroscopy in a scanning transmission electron microscope and the analysis of electron back-scatter diffraction patterns. Any possible detrimental effect of Nb on the observed crack tip damage due to Nb-rich oxide formation is not observed. Instead, evidence is presented to indicate that the tertiary γ′-precipitates are dissolving ahead of the crack consistent with the formation of oxides such as alumina and rutile. Our results have implications for alloy design efforts; at any given strength level, both more and less damage-tolerant variants of these alloys can be designed.

AB - The effect of Nb/Ti ratio on environmentally-assisted crack growth of three prototype Ni-based superalloys is studied. For these alloys, the yield strength is unaltered with increasing Nb/Ti ratio due to an increase in grain size. This situation has allowed the rationalization of the factors influencing damage tolerance at 700 °C. Primary intergranular cracks have been investigated using energy-dispersive X-ray spectroscopy in a scanning transmission electron microscope and the analysis of electron back-scatter diffraction patterns. Any possible detrimental effect of Nb on the observed crack tip damage due to Nb-rich oxide formation is not observed. Instead, evidence is presented to indicate that the tertiary γ′-precipitates are dissolving ahead of the crack consistent with the formation of oxides such as alumina and rutile. Our results have implications for alloy design efforts; at any given strength level, both more and less damage-tolerant variants of these alloys can be designed.

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On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys

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