High temperature properties and fatigue strength of novel wrought gamma/gamma' Co-base superalloys

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Details zur Publikation

Autor(en): Freund L, Giese S, Schwimmer D, Höppel HW, Neumeier S, Göken M
Zeitschrift: Journal of Materials Research
Verlag: CAMBRIDGE UNIV PRESS
Jahr der Veröffentlichung: 2017
Band: 32
Heftnummer: 24
Seitenbereich: 4475-4482
ISSN: 0884-2914


Abstract

This paper presents the high temperature yield and fatigue strength as well as thermophysical properties of two polycrystalline wrought gamma/gamma' Co-base superalloys developed for application in a temperature regime above 700 degrees C. The alloys CoW Alloy1 (Co42Ni32Cr12Al6W3Ti2.5Ta1.5 1 Si,C,B,Zr,Hf) and CoW Alloy2 (Co41Ni32Cr12Al9W5 1 Ti,Ta,Si,C,B,Zr,Hf) exhibited solidus temperatures of 1070 degrees C and 1030 degrees C, respectively, and a gamma' fraction of about 50%. CoW Alloy2 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 degrees C. When comparing the yield strength from tensile and compression tests, no asymmetry could be found. The low-cycle fatigue life of CoW Alloy2 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 degrees C, no additional phases were formed and the room temperature hardness barely changed.


FAU-Autoren / FAU-Herausgeber

Freund, Lisa
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Giese, Sven
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Höppel, Heinz Werner PD Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Neumeier, Steffen Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Schwimmer, Daniel
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)


Zitierweisen

APA:
Freund, L., Giese, S., Schwimmer, D., Höppel, H.W., Neumeier, S., & Göken, M. (2017). High temperature properties and fatigue strength of novel wrought gamma/gamma' Co-base superalloys. Journal of Materials Research, 32(24), 4475-4482. https://dx.doi.org/10.1557/jmr.2017.315

MLA:
Freund, Lisa, et al. "High temperature properties and fatigue strength of novel wrought gamma/gamma' Co-base superalloys." Journal of Materials Research 32.24 (2017): 4475-4482.

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Zuletzt aktualisiert 2018-27-11 um 18:10