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2020 | OriginalPaper | Buchkapitel

Supersolvus Hot Workability and Dynamic Recrystallization in Wrought Co–Al–W-Base Alloys

verfasst von : Katelun Wertz, Donald Weaver, Dongsheng Wen, Michael S. Titus, Rajiv Shivpuri, Stephen R. Niezgoda, Michael J. Mills, S. Lee Semiatin

Erschienen in: Superalloys 2020

Verlag: Springer International Publishing

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Abstract

Gamma-prime strengthened Co–Al–W-based superalloys offer a unique combination of weldability, mechanical strength, creep resistance, and environmental resistance at temperature—leading many to consider the system as an alternative to nickel-base superalloys for future generation turbine engine hardware. However, little information exists regarding the deformation processing required to turn these novel alloys into useable product forms with appropriate microstructure refinement. Supersolvus thermomechanical processing sequences were successfully demonstrated using right-cylindrical upset specimens for two wrought γ′-strengthened cobalt-base superalloys at industrially relevant temperatures and deformation rates. Hot flow behavior and microstructure evolution were quantitatively characterized and compared to available information on a legacy nickel-base system, Waspaloy. Further, density functional theory was used to explore the compositional dependency of the intrinsic material properties influencing single-phase hot working behavior of model Ni–Al binary and Co–Al–W ternary systems. The apparent similarity in the supersolvus thermomechanical processing behavior of Co–Al–W-base systems and their two-phase γ–γ′ Ni-base counterparts suggests conventional pathways, models, and equipment may be leveraged to speed transition and implementation of wrought Co–Al–W-base alloys for components where their properties may be advantageous.

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Titel: Supersolvus Hot Workability and Dynamic Recrystallization in Wrought Co–Al–W-Base Alloys
verfasst von: Katelun Wertz
Donald Weaver
Dongsheng Wen
Michael S. Titus
Rajiv Shivpuri
Stephen R. Niezgoda
Michael J. Mills
S. Lee Semiatin
Verlag: Springer International Publishing
Buch: Superalloys 2020
Print ISBN: 978-3-030-51833-2

Electronic ISBN: 978-3-030-51834-9

Copyright-Jahr: 2020
DOI: https://doi.org/10.1007/978-3-030-51834-9_84

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