On the Precipitation-Strengthening Contribution of the Ta-Containing Co3(Al,W)-Phase to the Creep Properties of γ/γ′ Cobalt-Base Superalloys
Bezold A, Volz N, Xue F, Zenk CH, Neumeier S, Göken M (2020)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2020
Journal
Book Volume: 51
Pages Range: 1567-1574
Journal Issue: 4
DOI: 10.1007/s11661-020-05626-2
Abstract
The creep strength of single-crystalline Co-based superalloys was found to be comparable to first-generation Ni-base superalloys. However, considerable shearing of the γ′ precipitates was observed in the early creep stages. To determine the strengthening contribution of the Ta-containing γ′-Co3(Al,W) precipitates, the creep strength of several single-crystalline Co-Al-W-Ta superalloys was determined as a function of the γ′ volume fraction at 1223 K (950 °C) and stress levels between 25 and 600 MPa. Employing a Lagneborg–Bergman–Reppich (LBR) approach, it is found that the strengthening contribution of the γ′ precipitates increases significantly with increasing γ′ volume fraction. In a Co-base superalloy that exhibits a precipitate volume fraction of about 70 pct, the γ′-strengthening contribution calculated with the LBR approach ranges between the ones observed in first-generation Ni-base superalloy CMSX-6 and second-generation Ni-base superalloy CMSX-4.
Authors with CRIS profile
Andreas Bezold
Sonderforschungsbereich/Transregio 103 Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen
Nicklas Volz
Sonderforschungsbereich/Transregio 103 Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen
Christopher Zenk
Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
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Involved external institutions
Germany (DE)
United States (USA) (US)How to cite
APA:
Bezold, A., Volz, N., Xue, F., Zenk, C.H., Neumeier, S., & Göken, M. (2020). On the Precipitation-Strengthening Contribution of the Ta-Containing Co3(Al,W)-Phase to the Creep Properties of γ/γ′ Cobalt-Base Superalloys. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 51(4), 1567-1574. https://doi.org/10.1007/s11661-020-05626-2
MLA:
Bezold, Andreas, et al. "On the Precipitation-Strengthening Contribution of the Ta-Containing Co3(Al,W)-Phase to the Creep Properties of γ/γ′ Cobalt-Base Superalloys." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science 51.4 (2020): 1567-1574.
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