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

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Bauer A, Neumeier S, Pyczak F, Singer R, Göken M
Zeitschrift: Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
Verlag: Elsevier
Jahr der Veröffentlichung: 2012
Band: 550
Seitenbereich: 333-341
ISSN: 0921-5093
Sprache: Englisch


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.



FAU-Autoren / FAU-Herausgeber

Bauer, Alexander Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Neumeier, Steffen Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Singer, Robert Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Autor(en) der externen Einrichtung(en)
Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH (HZG)


Zitierweisen

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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Zuletzt aktualisiert 2018-10-12 um 13:50