Macroscopic deformation behavior of a Ni base directionally solidified (DS) superalloy was experimentally investigated and an anisotropic constitutive model for the material was developed. Monotonic and creep tests were performed on uniaxial test specimens machined from DS plates so that the angles between loading direction and the solidified grain direction varied between 0 to 90 degrees. Tension-torsion creep tests were also conducted to examine the anisotropic behavior under multiaxial stress conditions. The material exhibited remarkable anisotropy under elastic and viscous deformation conditions, while it showed isotropy under plastic deformation conditions of high strain rates. Then crystal plasticity analyses were carried out to identify slip systems under creep loading conditions and presume the anisotropic creep behavior of the DS material analytically. A unified constitutive model was proposed to express both the anisotropic elasticity-viscosity and the isotropic plasticity. The elastic constants were determined applying a self-consistent approach to the material, and viscous parameters were modeled on the basis of the crystal plasticity analyses. Calculation results obtained using the constitutive model were compared to the experimental data to evaluate validity of the model. It was demonstrated that the constitutive model could adequately describe the anisotropic behavior under uniaxial and multiaxial stress conditions with a set of material parameters.
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ASME 2007 Pressure Vessels and Piping Conference
July 22–26, 2007
San Antonio, Texas, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4287-8
PROCEEDINGS PAPER
A Unified Anisotropic Constitutive Model for a Ni Base Directionally Solidified Superalloy
Masatsugu Yaguchi,
Masatsugu Yaguchi
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
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Masato Yamamoto,
Masato Yamamoto
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
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Takashi Ogata
Takashi Ogata
Central Research Institute of Electric Power Industry, Tokyo, Japan
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Masatsugu Yaguchi
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
Masato Yamamoto
Central Research Institute of Electric Power Industry, Komae, Tokyo, Japan
Takashi Ogata
Central Research Institute of Electric Power Industry, Tokyo, Japan
Paper No:
CREEP2007-26527, pp. 135-141; 7 pages
Published Online:
August 20, 2009
Citation
Yaguchi, M, Yamamoto, M, & Ogata, T. "A Unified Anisotropic Constitutive Model for a Ni Base Directionally Solidified Superalloy." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 9: Eighth International Conference on Creep and Fatigue at Elevated Temperatures. San Antonio, Texas, USA. July 22–26, 2007. pp. 135-141. ASME. https://doi.org/10.1115/CREEP2007-26527
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