Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applications

A new wrought CrCoNi-based medium-entropy superalloy (MESA) was designed by changing the composition of a commercial superalloy of type C-263, which is used for stationary components in gas turbines. ∼5 at.% Cr and 0.85 at.% Ti + Al were added at the expense of Ni while the Ti/Al ratio was decreased...

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Main Authors: Julian Hunfeld, Hannah Sommer, Jürgen Kiese, Hongcai Wang, Ahmadreza Riyahi khorasgani, Tong Li, Christoph Somsen, Aleksander Kostka, Guillaume Laplanche
Format: Article
Language:English
Published: Elsevier 2021-12-01
Series:Materials & Design
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S0264127521007292
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author Julian Hunfeld
Hannah Sommer
Jürgen Kiese
Hongcai Wang
Ahmadreza Riyahi khorasgani
Tong Li
Christoph Somsen
Aleksander Kostka
Guillaume Laplanche
author_facet Julian Hunfeld
Hannah Sommer
Jürgen Kiese
Hongcai Wang
Ahmadreza Riyahi khorasgani
Tong Li
Christoph Somsen
Aleksander Kostka
Guillaume Laplanche
author_sort Julian Hunfeld
collection DOAJ
description A new wrought CrCoNi-based medium-entropy superalloy (MESA) was designed by changing the composition of a commercial superalloy of type C-263, which is used for stationary components in gas turbines. ∼5 at.% Cr and 0.85 at.% Ti + Al were added at the expense of Ni while the Ti/Al ratio was decreased. Owing to these modifications, the brittle η phase, which is stable in C-263 below 900 °C is no longer observed in C-264. Besides, the solvus temperature and volume fraction of the γ′ phase in the peak-aged state are larger in C-264 (∼935 °C, 13.5%) compared to C-263 (∼890 °C, 12.8%), resulting in superior tensile and creep properties. The stress and temperature dependencies of the creep rates were described by power-law and Arrhenius relationships. The stress exponents were between 4 and 5, while the apparent activation energies were 550 and 400 kJ/mol for C-264 and C-263, respectively. During creep at 880 °C in air, internal nitridation in both MESAs resulted in the formation of TiN precipitates, with C-264 being slightly more affected due to its higher nitrogen solubility. Due to its superior creep resistance, good malleability and machinability, the C-264 MESA is currently commercially available from VDM Metals International.
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spelling doaj.art-ca583dd886804305846c975c3d33ab702022-12-21T21:32:24ZengElsevierMaterials & Design0264-12752021-12-01211110174Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applicationsJulian Hunfeld0Hannah Sommer1Jürgen Kiese2Hongcai Wang3Ahmadreza Riyahi khorasgani4Tong Li5Christoph Somsen6Aleksander Kostka7Guillaume Laplanche8Institut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Corresponding author.Institut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, GermanyVDM Metals International, D-58762 Altena, GermanyInstitut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, GermanyInstitut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Interdisciplinary Centre for Advanced Materials Simulation (ICAMS), Ruhr-Universität Bochum, 44801 Bochum, GermanyInstitut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, GermanyInstitut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, GermanyCenter for Interface-Dominated High Performance Materials (ZGH), Ruhr-University Bochum, GermanyInstitut für Werkstoffe, Ruhr-Universität Bochum, D-44780 Bochum, GermanyA new wrought CrCoNi-based medium-entropy superalloy (MESA) was designed by changing the composition of a commercial superalloy of type C-263, which is used for stationary components in gas turbines. ∼5 at.% Cr and 0.85 at.% Ti + Al were added at the expense of Ni while the Ti/Al ratio was decreased. Owing to these modifications, the brittle η phase, which is stable in C-263 below 900 °C is no longer observed in C-264. Besides, the solvus temperature and volume fraction of the γ′ phase in the peak-aged state are larger in C-264 (∼935 °C, 13.5%) compared to C-263 (∼890 °C, 12.8%), resulting in superior tensile and creep properties. The stress and temperature dependencies of the creep rates were described by power-law and Arrhenius relationships. The stress exponents were between 4 and 5, while the apparent activation energies were 550 and 400 kJ/mol for C-264 and C-263, respectively. During creep at 880 °C in air, internal nitridation in both MESAs resulted in the formation of TiN precipitates, with C-264 being slightly more affected due to its higher nitrogen solubility. Due to its superior creep resistance, good malleability and machinability, the C-264 MESA is currently commercially available from VDM Metals International.http://www.sciencedirect.com/science/article/pii/S0264127521007292CoCrNiNimonic C-263CreepCorrosionPhase stability
spellingShingle Julian Hunfeld
Hannah Sommer
Jürgen Kiese
Hongcai Wang
Ahmadreza Riyahi khorasgani
Tong Li
Christoph Somsen
Aleksander Kostka
Guillaume Laplanche
Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applications
Materials & Design
CoCrNi
Nimonic C-263
Creep
Corrosion
Phase stability
title Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applications
title_full Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applications
title_fullStr Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applications
title_full_unstemmed Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applications
title_short Design of a new wrought CrCoNi-based medium-entropy superalloy C-264 for high-temperature applications
title_sort design of a new wrought crconi based medium entropy superalloy c 264 for high temperature applications
topic CoCrNi
Nimonic C-263
Creep
Corrosion
Phase stability
url http://www.sciencedirect.com/science/article/pii/S0264127521007292
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