Verification of a commercial CALPHAD database for Re and Ru containing nickel-base superalloys

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Rettig R, Heckl A, Neumeier S, Pyczak F, Göken M, Singer R
Zeitschrift: Defect and Diffusion Forum
Verlag: Trans Tech Publications
Jahr der Veröffentlichung: 2009
Band: 289-292
Seitenbereich: 101-108
ISBN: 9783908451723
ISSN: 1012-0386
eISSN: 1662-9507


Abstract


The addition of rhenium and ruthenium to single crystal nickel-base superalloys improves the high-temperature properties of the alloys. In this work the applicability of the database TTNi7 (ThermoTech Ltd, UK) for developing 4 generation single crystal superalloys containing rhenium (Re) and ruthenium (Ru) was investigated. We systematically compared experimentally determined alloy properties to the predictions of ThermoCalc with the database TTNi7. The investigated properties were liquidus, solidus and γ′ solvus temperature as well as incipient melting point and segregation. Calculations were based on thermodynamic principles with the assumption of either equilibrium or Scheil-Gulliver conditions, i.e. no diffusion in the solid and complete diffusion in the liquid. Furthermore the composition of the γ and the γ′ phase of a Re- and Ru-containing superalloy was measured and compared to calculations. Our results show that the database is capable of simulating general trends of 4 generation superalloys up to 6 weight percent (wt.-%) Re and 6 wt.-% Ru. The present work shows that Scheil-Gulliver calculations can only be used as a first approximation for nickel-base superalloys. © (2009) Trans Tech Publications.



FAU-Autoren / FAU-Herausgeber

Göken, Mathias Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Heckl, Astrid
Graduiertenzentrum der FAU
Neumeier, Steffen Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)
Rettig, Ralf Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
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:
Rettig, R., Heckl, A., Neumeier, S., Pyczak, F., Göken, M., & Singer, R. (2009). Verification of a commercial CALPHAD database for Re and Ru containing nickel-base superalloys. Defect and Diffusion Forum, 289-292, 101-108. https://dx.doi.org/10.4028/www.scientific.net/DDF.289-292.101

MLA:
Rettig, Ralf, et al. "Verification of a commercial CALPHAD database for Re and Ru containing nickel-base superalloys." Defect and Diffusion Forum 289-292 (2009): 101-108.

BibTeX: 

Zuletzt aktualisiert 2018-08-08 um 03:46