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The Formation of Downward Freckles in Nb-Containing Superalloy Remelt Ingots Read chapter Read first chapter

2023 | OriginalPaper | Chapter

Subcritical Crack Growth of Alloy 718 in Marine Exposure Conditions and Microstructural Modeling

Authors : A. Arcari, D. J. Horton, M. Zikry, M. Chen

Published in: Proceedings of the 10th International Symposium on Superalloy 718 and Derivatives

Publisher: Springer Nature Switzerland

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Abstract

UNS N07718 is widely used in marine service applications under a variety of conditions: alternate immersion, different levels of cathodic protection, and freely corroding galvanic couples. Environmentally assisted cracking can significantly affect the performance of this alloy and constrains design as it needs to account for subcritical crack growth in service. We measured subcritical crack growth rates and thresholds in different environmental conditions for two different heat treatments of UNS N07718. The first heat treatment, following AMS 5664 is widely used in the aircraft industry and for marine fasteners, and the second, following API 6A, is principally used in the marine and oil and gas industries. The material environmentally assisted cracking was studied under alternate immersion to natural seawater and under cathodic protection in natural seawater. Microstructural modeling is presented to understand and predict how precipitates, their volume fraction, morphology, and properties, affect the evolution and accumulation of dislocation densities within the microstructure, influencing the fracture process at different physical scales.

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Metadata
Title
Subcritical Crack Growth of Alloy 718 in Marine Exposure Conditions and Microstructural Modeling
Authors
A. Arcari
D. J. Horton
M. Zikry
M. Chen
Copyright Year
2023
Book
Proceedings of the 10th International Symposium on Superalloy 718 and Derivatives

Print ISBN: 978-3-031-27446-6

Electronic ISBN: 978-3-031-27447-3

Copyright Year: 2023

DOI
https://doi.org/10.1007/978-3-031-27447-3_19

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