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High temperature properties and fatigue strength of novel wrought γ/γ′ Co-base superalloys

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Abstract

This paper presents the high temperature yield and fatigue strength as well as thermophysical properties of two polycrystalline wrought γ/γ′ Co-base superalloys developed for application in a temperature regime above 700 °C. The alloys CoWAlloy1 (Co42Ni32Cr12Al6W3Ti2.5Ta1.5 + Si,C,B,Zr,Hf) and CoWAlloy2 (Co41Ni32Cr12Al9W5 + Ti,Ta,Si,C,B,Zr,Hf) exhibited solidus temperatures of 1070 °C and 1030 °C, respectively, and a γ′ fraction of about 50%. CoWAlloy2 displayed a rather high Young’s modulus of 250 GPa. The two Co-base superalloys showed a good high temperature strength exceeding Ni-base disc alloys U720Li and Waspaloy at temperatures above 800 °C. When comparing the yield strength from tensile and compression tests, no asymmetry could be found. The low-cycle fatigue life of CoWAlloy2 at a total strain amplitude of 0.5% is similar to that of U720Li and Waspaloy (about 370 cycles, R = −1). During long-term aging for 1024 h at 750 °C, no additional phases were formed and the room temperature hardness barely changed.

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ACKNOWLEDGMENTS

The authors acknowledge funding by the German Research Foundation (DFG) through project B3 of the collaborative research center SFB/Transregio 103 “From Atoms to Turbine Blades—a Scientific Approach for Developing the Next Generation of Single Crystal Superalloys”.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Friedrich-Alexander Universität Erlangen-Nürnberg, Institute I, Erlangen, 91058, Germany

    Lisa Patricia Freund, Sven Giese, Daniel Schwimmer, Heinz Werner Höppel, Steffen Neumeier & Mathias Göken

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  1. Lisa Patricia Freund
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  2. Sven Giese
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  4. Heinz Werner Höppel
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Correspondence to Lisa Patricia Freund.

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This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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Freund, L.P., Giese, S., Schwimmer, D. et al. High temperature properties and fatigue strength of novel wrought γ/γ′ Co-base superalloys. Journal of Materials Research 32, 4475–4482 (2017). https://doi.org/10.1557/jmr.2017.315

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