Exploring Microstructural Characteristics, Mechanical Behavior, Hydrogen Embrittlement, and Long-Term Stability of Polycrystalline CoNiCr-Based Superalloys

Tsankova S, Nagel O, Bezold A, Grandjean B, Kirchmayer A, Göken M, Neumeier S (2024)


Publication Type: Conference contribution

Publication year: 2024

Publisher: Springer Science and Business Media Deutschland GmbH

Pages Range: 317-327

Conference Proceedings Title: Minerals, Metals and Materials Series

Event location: Pennsylvania, PA, USA

ISBN: 9783031639364

DOI: 10.1007/978-3-031-63937-1_30

Abstract

Polycrystalline γ/γ′ CoNiCr-based superalloysSuperalloys have a promising combination of properties for aerospace and stationary gas turbine applications. In this study, four alloys, CoWAlloy1, 2, 3, and 6, were selected for further investigation. MicrostructuresMicrostructure of fully heat-treated materials were characterized by scanning and transmission electron microscopyTransmission electron microscopy, and long-term stabilityLong-term stability at 750 °C was examined for various durations up to 1000 h. Tensile tests were performed between 25 °C and 700 °C, revealing dynamic strain agingDynamic strain aging in CoWAlloy2, 3, and 6 at intermediate temperatures of 400–650 °C. Hydrogen charging induced a decrease in tensile ductility at 25 °C in the µ phase containing CoWAlloy3. CreepCreep experiments were performed on CoWAlloy1, an alloy with increased Ti and Ta content, at 750 °C and 800 MPa, with variations of the secondary γ′ precipitatePrecipitates size and grain sizeGrain size to identify optimal microstructural parameters. It was found that smaller grain sizesGrain size lead to a significantly higher creep resistanceCreep resistance at these testing conditions.

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How to cite

APA:

Tsankova, S., Nagel, O., Bezold, A., Grandjean, B., Kirchmayer, A., Göken, M., & Neumeier, S. (2024). Exploring Microstructural Characteristics, Mechanical Behavior, Hydrogen Embrittlement, and Long-Term Stability of Polycrystalline CoNiCr-Based Superalloys. In Jonathan Cormier, Ian Edmonds, Stephane Forsik, Paraskevas Kontis, Corey O’Connell, Timothy Smith, Akane Suzuki, Sammy Tin, Jian Zhang (Eds.), Minerals, Metals and Materials Series (pp. 317-327). Pennsylvania, PA, USA: Springer Science and Business Media Deutschland GmbH.

MLA:

Tsankova, Svetoslava, et al. "Exploring Microstructural Characteristics, Mechanical Behavior, Hydrogen Embrittlement, and Long-Term Stability of Polycrystalline CoNiCr-Based Superalloys." Proceedings of the 15th International Symposium on Superalloys, ISS 2024, Pennsylvania, PA, USA Ed. Jonathan Cormier, Ian Edmonds, Stephane Forsik, Paraskevas Kontis, Corey O’Connell, Timothy Smith, Akane Suzuki, Sammy Tin, Jian Zhang, Springer Science and Business Media Deutschland GmbH, 2024. 317-327.

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