Analysis of high-temperature creep deformation in a polycrystalline nickel-base superalloy

A. Soula; Y. Renollet; D. Boivin; J. L. Pouchou; D. Locq; P. Caron; Y. Bréchet

doi:10.1016/j.msea.2008.04.122

Analysis of high-temperature creep deformation in a polycrystalline nickel-base superalloy

A. Soula, Y. Renollet, D. Boivin, J. L. Pouchou, D. Locq, P. Caron, Y. Bréchet

Research output: Contribution to journal › Article › Research › peer-review

46 Citations (Scopus)

Abstract

A new quantitative method has been developed for the analysis of the high-temperature creep deformation of polycrystalline nickel-base superalloys. Local deformation was measured by means of microextensometry using ceramic square grids deposited on flat specimens thanks to an electron lithography technique. The efficiency of this method has been proved for tensile creep tests performed under vacuum at 750 °C and 525 MPa on the NR6 superalloy and for a wide range of creep strains. This study revealed localization of deformation at grain boundaries and slip bands within the grains. A specific analysis method based on image correlation was developed to quantify the local strain fields. Electron back-scatter diffraction analysis showed that grain boundary sliding is mainly concentrated at general grain boundaries.

Original language	English
Pages (from-to)	301-306
Number of pages	6
Journal	Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume	510-511
Issue number	C
DOIs	https://doi.org/10.1016/j.msea.2008.04.122
Publication status	Published - 15 Jun 2009
Externally published	Yes

Keywords

Creep
Grain boundary sliding
High temperature
Microextensometry
Superalloy

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10.1016/j.msea.2008.04.122

Cite this

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title = "Analysis of high-temperature creep deformation in a polycrystalline nickel-base superalloy",

abstract = "A new quantitative method has been developed for the analysis of the high-temperature creep deformation of polycrystalline nickel-base superalloys. Local deformation was measured by means of microextensometry using ceramic square grids deposited on flat specimens thanks to an electron lithography technique. The efficiency of this method has been proved for tensile creep tests performed under vacuum at 750 °C and 525 MPa on the NR6 superalloy and for a wide range of creep strains. This study revealed localization of deformation at grain boundaries and slip bands within the grains. A specific analysis method based on image correlation was developed to quantify the local strain fields. Electron back-scatter diffraction analysis showed that grain boundary sliding is mainly concentrated at general grain boundaries.",

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AU - Soula, A.

AU - Renollet, Y.

AU - Boivin, D.

AU - Pouchou, J. L.

AU - Locq, D.

AU - Caron, P.

AU - Bréchet, Y.

PY - 2009/6/15

Y1 - 2009/6/15

N2 - A new quantitative method has been developed for the analysis of the high-temperature creep deformation of polycrystalline nickel-base superalloys. Local deformation was measured by means of microextensometry using ceramic square grids deposited on flat specimens thanks to an electron lithography technique. The efficiency of this method has been proved for tensile creep tests performed under vacuum at 750 °C and 525 MPa on the NR6 superalloy and for a wide range of creep strains. This study revealed localization of deformation at grain boundaries and slip bands within the grains. A specific analysis method based on image correlation was developed to quantify the local strain fields. Electron back-scatter diffraction analysis showed that grain boundary sliding is mainly concentrated at general grain boundaries.

AB - A new quantitative method has been developed for the analysis of the high-temperature creep deformation of polycrystalline nickel-base superalloys. Local deformation was measured by means of microextensometry using ceramic square grids deposited on flat specimens thanks to an electron lithography technique. The efficiency of this method has been proved for tensile creep tests performed under vacuum at 750 °C and 525 MPa on the NR6 superalloy and for a wide range of creep strains. This study revealed localization of deformation at grain boundaries and slip bands within the grains. A specific analysis method based on image correlation was developed to quantify the local strain fields. Electron back-scatter diffraction analysis showed that grain boundary sliding is mainly concentrated at general grain boundaries.

KW - Creep

KW - Grain boundary sliding

KW - High temperature

KW - Microextensometry

KW - Superalloy

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Analysis of high-temperature creep deformation in a polycrystalline nickel-base superalloy

Abstract

Keywords

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