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

Freund L, Giese S, Schwimmer D, Höppel HW, Neumeier S, Göken M (2017)

Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Journal of Materials Research Cambridge University Press (CUP) / Materials Research Society

Publisher: CAMBRIDGE UNIV PRESS

Book Volume: 32

Pages Range: 4475-4482

Journal Issue: 24

DOI: 10.1557/jmr.2017.315

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.

Authors with CRIS profile

Lisa Freund Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Sven Giese Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Daniel Schwimmer Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Heinz Werner Höppel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

B03 (FP2): Einkristalline y'-gehärtete Co-Basis-Superlegierungen - Legierungsentwicklung, Gitterfehlpassung und mechanische Eigenschaften (SFB/TRR 103) SFB/TRR 103 Jan. 1, 2016 - Dec. 31, 2019

How to cite

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.

BibTeX: Download