Creep properties of different γ'-strengthened Co-base superalloys

Bauer A, Neumeier S, Pyczak F, Singer R, Göken M (2012)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2012

Journal

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing Elsevier

Publisher: Elsevier

Book Volume: 550

Pages Range: 333-341

DOI: 10.1016/j.msea.2012.04.083

Abstract

The influence of various alloying elements on the creep properties of polycrystalline Co-base superalloys hardened by a ternary L1 compound, Co (Al,W) (γ'-phase), was investigated. A Ti containing quaternary alloy shows creep strength similar to Ni-base superalloys IN100 and IN713C at 850°C and strongly superior to conventional Co-base superalloys as Haynes188. The activation energy for creep between 850 and 950°C is similar to the polycrystalline Ni-base superalloy IN100 in the same temperature range. Strengthening of the grain boundaries by third phase precipitates was found to be crucial for the mechanical properties. This can be achieved either by precipitation of borides or by additional intermetallic phases which precipitate due to oversaturation. During compressive creep at 850°C only a slight tendency for directional coarsening occurs, while at 950°C distinct γ/γ'-rafts perpendicular to the external compressive stress axis are formed which indicate a positive lattice misfit even at 950°C. © 2012 Elsevier B.V.

Authors with CRIS profile

Alexander Bauer Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Robert Singer Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

GRK 1229: Stabile und metastabile Mehrphasensysteme bei hohen Anwendungstemperaturen April 1, 2006 - March 30, 2015

Involved external institutions

Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH (HZG) DE Germany (DE)

How to cite

APA:

Bauer, A., Neumeier, S., Pyczak, F., Singer, R., & Göken, M. (2012). Creep properties of different γ'-strengthened Co-base superalloys. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 550, 333-341. https://dx.doi.org/10.1016/j.msea.2012.04.083

MLA:

Bauer, Alexander, et al. "Creep properties of different γ'-strengthened Co-base superalloys." Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 550 (2012): 333-341.

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