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

Rettig R, Heckl A, Neumeier S, Pyczak F, Göken M, Singer R (2009)

Publication Status: Published

Publication Type: Journal article

Publication year: 2009

Journal

Defect and Diffusion Forum Trans Tech Publications

Publisher: Trans Tech Publications

Book Volume: 289-292

Pages Range: 101-108

Event location: Lanzarote

ISBN: 9783908451723

DOI: 10.4028/www.scientific.net/DDF.289-292.101

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.

Authors with CRIS profile

Ralf Rettig Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle) Astrid Heckl Graduiertenzentrum der FAU Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Robert Singer Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)

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 Activity Development of high temperature alloys Jan. 1, 1990 - Jan. 1, 1993

Involved external institutions

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

How to cite

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.

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