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Creep of Single Crystals of Nickel-Based Superalloys at Ultra-High Homologous Temperature

Epishin, Alexander and Fedelich, Bernard and Nolze, Gert and Schriever, Sina and Feldmann, Titus and Ijaz, Muhammad Farzik and Viguier, Bernard and Poquillon, Dominique and Le Bouar, Yann and Ruffini, Antoine and Finel, Alphonse Creep of Single Crystals of Nickel-Based Superalloys at Ultra-High Homologous Temperature. (2018) Metallurgical and Materials Transactions A, 49 (9). 3973-3987. ISSN 1073-5623

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Official URL: https://doi.org/10.1007/s11661-018-4729-6

Abstract

The creep behavior of single crystals of the nickel-based superalloy CMSX-4 was investigated at 1288°C, which is the temperature of the hot isostatic pressing treatment applied to this superalloy in the industry. It was found that at this super-solvus temperature, where no gamma' strengthening occurs, the superalloy is very soft and rapidly deforms under stresses between 4 and 16 MPa. The creep resistance was found to be very anisotropic, e.g., the creep rate of [001] crystals was about 11 times higher than that of a [111] crystal. The specimens of different orientations also showed a very different necking behavior. The reduction of the cross-sectional area Psi of [001] crystals reached nearly 100 pct, while for a [111] crystal Psi=62 pct. The EBSD analysis of deformed specimens showed that despite such a large local strain the [001] crystals did not recrystallize, while a less deformed [111] crystal totally recrystallized within the necking zone. The recrystallization degree was found to be correlated with deformation behavior as well as with dwell time at high temperature. From the analysis of the obtained results (creep anisotropy, stress dependence of the creep rate, traces of shear deformation, and TEM observations), it was concluded that the main strain contribution resulted from (011){111} octahedral slip.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Federal Institute for Materials Research and Testing - BAM (GERMANY)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Other partners > Technische Universität Berlin - TU Berlin (GERMANY)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
Funders:
German Research Foundation DFG - French National Research Agency ANR
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Deposited By: cirimat webmestre
Deposited On:07 Mar 2019 09:42

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