Creep and Tensile Behavior of a Nickel-Based Single Crystal Superalloy With a Bimodal γ′ Precipitation

High temperature aircraft engines components made from single crystal nickel-based superalloys typically have homogenous γ / γ ′ microstructure after conventional solution and aging heat treatments. However, manufacturing processes as well as service conditions may alter the material’s microstructur...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2023-05, Vol.54 (5), p.1496-1508
Main Authors: Rame, Jérémy, Eyidi, Dominique, Joulain, Anne, Gauthé, Maëlys, Cormier, Jonathan
Format: Article
Language:English
Subjects:
Aircraft engines
Characterization and Evaluation of Materials
Chemistry and Materials Science
Condensed Matter
Creep (materials)
Fourth European Symposium on Superalloys and their Applications
Heat treating
Heat treatment
High temperature
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanotechnology
Nickel
Nickel base alloys
Physics
Precipitates
Shearing
Single crystals
Structural Materials
Superalloys
Surfaces and Interfaces
Thin Films
Topical Collection: Processing and Applications of Superalloys
Yield stress
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Summary:High temperature aircraft engines components made from single crystal nickel-based superalloys typically have homogenous γ / γ ′ microstructure after conventional solution and aging heat treatments. However, manufacturing processes as well as service conditions may alter the material’s microstructure which can lead to a multimodal γ ′ precipitation with regular secondary precipitates (400 to 500 nm) and smaller (10 to 100 nm) tertiary precipitates. In this study, such a bimodal microstructure was first obtained after a heat treatment study and the impact of such a microstructure on mechanical behavior was then investigated. Tensile and creep properties are sensitive to such a bimodal microstructure below 900 °C with a 60 to 120 MPa reduction in yield stress and a creep lifetime reduced by factors of 2 to 15 compared to a unimodal reference microstructure. It is suggested that tertiary γ ′ precipitates facilitates secondary γ ′ shearing reducing tensile and creep properties. Above 900 °C, no difference in tensile and creep behavior has been observed between both kinds of microstructure as tertiary precipitates are rapidly dissolving.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-023-07022-y