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Journal of Materials Engineering and Performance

Erschienen in:

15.10.2018

Creep Properties of Directionally Solidified Nb-Modified Ni-Base Superalloy, Mar-M247

verfasst von: A. M. S. Costa, E. Hawk, J. Dansbury, C. A. Nunes, G. E. Fuchs

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 11/2018

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Abstract

The Ni-base superalloy Mar-M247 is widely used for elevated-temperature applications in both equiaxed and directionally solidified forms. The alloy contains about 3 wt.% Ta. Due to the cost and density of Ta, an atom-for-atom substitution of Nb for Ta was investigated. The creep properties in the temperature range of 750-950 °C and stresses ranging from 200 to 1000 MPa were determined. In general, the creep properties of the Nb-modified Mar-M247 material were very similar to those of Mar-M247 samples at 750 and 850 °C. However, the Mar-M247 samples exhibited superior creep properties at 950 °C. The lower creep properties of the Nb-modified Mar-M247 are likely due to the finer starting microstructure, more rapid coarsening rate of the γ′ and reduced γ′ strengthening effect (i.e., APB energy) of Nb, compared to Ta. No evidence of TCP phases was observed in either alloy.

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Titel: Creep Properties of Directionally Solidified Nb-Modified Ni-Base Superalloy, Mar-M247
verfasst von: A. M. S. Costa
E. Hawk
J. Dansbury
C. A. Nunes
G. E. Fuchs
Publikationsdatum: 15.10.2018
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 11/2018
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3699-6

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