Effects of Solid Solution Strengthening Elements Mo, Re, Ru, and W on Transition Temperatures in Nickel-Based Superalloys with High γ′-Volume Fraction: Comparison of Experiment and CALPHAD Calculations

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Details zur Publikation

Autor(en): Ritter N, Sowa R, Schauer JC, Gruber D, Göhler T, Rettig R, Körner C, Singer R
Zeitschrift: Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science
Jahr der Veröffentlichung: 2018
ISSN: 1073-5623
Sprache: Englisch


Abstract

We prepared 41 different superalloy compositions by an arc melting, casting, and heat treatment process. Alloy solid solution strengthening elements were added in graded amounts, and we measured the solidus, liquidus, and γ′-solvus temperatures of the samples by DSC. The γ′-phase fraction increased as the W, Mo, and Re contents were increased, and W showed the most pronounced effect. Ru decreased the γ′-phase fraction. Melting temperatures (i.e., solidus and liquidus) were increased by addition of Re, W, and Ru (the effect increased in that order). Addition of Mo decreased the melting temperature. W was effective as a strengthening element because it acted as a solid solution strengthener and increased the fraction of fine γ′-precipitates, thus improving precipitation strengthening. Experimentally determined values were compared
with calculated values based on the CALPHAD software tools Thermo-Calc (databases: TTNI8 and TCNI6) and MatCalc (database ME-NI). The ME-NI database, which was specially adapted to the present investigation, showed good agreement. TTNI8 also showed good results. The TCNI6 database is suitable for computational design of complex nickel-based superalloys. However, a large deviation remained between the experiment results and calculations based on this database. It also erroneously predicted γ′-phase separations and failed to describe the Ru-effect on transition temperatures.


FAU-Autoren / FAU-Herausgeber

Göhler, Thomas
Technische Fakultät
Körner, Carolin Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Rettig, Ralf Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Ritter, Nils
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Schauer, Jan Christian
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)
Institute of Nuclear Physics PAN / Instytut Fizyki Jądrowej im. Henryka Niewodniczańskiego PAN


Zitierweisen

APA:
Ritter, N., Sowa, R., Schauer, J.C., Gruber, D., Göhler, T., Rettig, R.,... Singer, R. (2018). Effects of Solid Solution Strengthening Elements Mo, Re, Ru, and W on Transition Temperatures in Nickel-Based Superalloys with High γ′-Volume Fraction: Comparison of Experiment and CALPHAD Calculations. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science. https://dx.doi.org/10.1007/s11661-018-4730-0

MLA:
Ritter, Nils, et al. "Effects of Solid Solution Strengthening Elements Mo, Re, Ru, and W on Transition Temperatures in Nickel-Based Superalloys with High γ′-Volume Fraction: Comparison of Experiment and CALPHAD Calculations." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science (2018).

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Zuletzt aktualisiert 2018-16-10 um 11:23