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...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Elsevier
2021-12-01
|
Series: | Materials & Design |
Subjects: | |
Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127521007292 |
_version_ | 1831585185196408832 |
---|---|
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. |
first_indexed | 2024-12-17T21:13:24Z |
format | Article |
id | doaj.art-ca583dd886804305846c975c3d33ab70 |
institution | Directory Open Access Journal |
issn | 0264-1275 |
language | English |
last_indexed | 2024-12-17T21:13:24Z |
publishDate | 2021-12-01 |
publisher | Elsevier |
record_format | Article |
series | Materials & Design |
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 |
work_keys_str_mv | AT julianhunfeld designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT hannahsommer designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT jurgenkiese designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT hongcaiwang designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT ahmadrezariyahikhorasgani designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT tongli designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT christophsomsen designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT aleksanderkostka designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications AT guillaumelaplanche designofanewwroughtcrconibasedmediumentropysuperalloyc264forhightemperatureapplications |