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Metallurgical and Materials Transactions A
Erschienen in: Metallurgical and Materials Transactions A 9/2018

29.06.2018 | Topical Collection: Superalloys and Their Applications

Mechanical Properties Evolution of γ′/γ″ Nickel-Base Superalloys During Long-Term Thermal Over-Aging

verfasst von: A. Agnoli, C. Le Gall, J. Thebault, E. Marin, J. Cormier

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 9/2018

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Abstract

The long-term stability of Inconel 718 and Waspaloy forgings in the 600 °C to 850 °C temperature range and up to 10,000 hours was studied by means of mechanical tests and microstructural analyses. Hardness and tensile properties were found to decrease with increasing over-aging time and temperature. The comparative analysis of tensile results of both alloys indicates that they exhibit an equivalent stability over time if the over-aging temperature of Waspaloy is increased by 50 °C to 100 °C compared to Inconel 718. No detrimental intermetallic precipitation at grain boundaries has been detected in both alloys. Microstructure characterizations performed by scanning electron microscopy indicate that the higher stability of Waspaloy can be attributed to the slower kinetics of coarsening and dissolution of γ′ precipitates with respect to γ″ precipitates that account for the majority of hardening particles in Inconel 718. Additionally, fatigue results indicate that in both alloys over-aging promotes surface crack initiation, thus leading to shorter fatigue life.
Vorheriger Artikel In Situ Diagnostics of Damage Accumulation in Ni-Based Superalloys Using High-Temperature Computed Tomography
Nächster Artikel Study into the Role of Nickel Vapor on Surface Modification of a Third-Generation Single-Crystal Superalloy

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Metadaten
Titel
Mechanical Properties Evolution of γ′/γ″ Nickel-Base Superalloys During Long-Term Thermal Over-Aging
verfasst von
A. Agnoli
C. Le Gall
J. Thebault
E. Marin
J. Cormier
Publikationsdatum
29.06.2018
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 9/2018
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-018-4778-x

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