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

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

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 11.05.2018, p. 1-15.

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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. / On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys. In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 2018 ; pp. 1-15.

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@article{2517c98ced804cc99e36b648606df827,
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.",
author = "N{\'e}meth, {A. A.N.} and Collins, {D. M.} and Crudden, {D. J.} and V. Kuksenko and Liebscher, {C. H.} and Armstrong, {D. E.J.} and Wilkinson, {A. J.} and Reed, {R. C.}",
year = "2018",
month = may,
day = "11",
doi = "10.1007/s11661-018-4619-y",
language = "English",
pages = "1--15",
journal = "Metallurgical and Materials Transactions A",
issn = "1073-5623",
publisher = "ASM International",

}

RIS

TY - JOUR

T1 - On the Influence of Nb/Ti Ratio on Environmentally-Assisted Crack Growth in High-Strength Nickel-Based Superalloys

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.

PY - 2018/5/11

Y1 - 2018/5/11

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.

UR - http://www.scopus.com/inward/record.url?scp=85046792998&partnerID=8YFLogxK

U2 - 10.1007/s11661-018-4619-y

DO - 10.1007/s11661-018-4619-y

M3 - Article

AN - SCOPUS:85046792998

SP - 1

EP - 15

JO - Metallurgical and Materials Transactions A

JF - Metallurgical and Materials Transactions A

SN - 1073-5623

ER -