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From Modeling of Plasticity in Single-Crystal Superalloys to High-Resolution X-rays Three-Crystal Diffractometer Peaks Simulation

  • Symposium: Neutron and X-Ray Studies of Advanced Materials VIII
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Abstract

The dislocation-based modeling of the high-temperature creep of two-phased single-crystal superalloys requires input data beyond strain vs time curves. This may be obtained by use of in situ experiments combining high-temperature creep tests with high-resolution synchrotron three-crystal diffractometry. Such tests give access to changes in phase volume fractions and to the average components of the stress tensor in each phase as well as the plastic strain of each phase. Further progress may be obtained by a new method making intensive use of the Fast Fourier Transform, and first modeling the behavior of a representative volume of material (stress fields, plastic strain, dislocation densities…), then simulating directly the corresponding diffraction peaks, taking into account the displacement field within the material, chemical variations, and beam coherence. Initial tests indicate that the simulated peak shapes are close to the experimental ones and are quite sensitive to the details of the microstructure and to dislocation densities at interfaces and within the soft γ phase.

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Acknowledgments

The author would like to thank S. Berbenni (LEM3 Metz) for an introduction to FFT methods in elasticity and further useful discussions, Jonathan Cormier for comments on the metallurgy of superalloys, Martin Von Zimmermann and Uta Rütt (DESY), for their help with the triple-crystal diffractometer at DESY (BW5 and P07), Thomas Schenk and Mohamed Biskri for their contribution to the in situ experiments. The specimens were provided by A. Longuet (SNECMA, groupe SAFRAN). The travel costs of the experiments at DESY were funded by within the initiative “CALIPSO: EU Support of Access to Synchrotrons/FELs in Europe.”

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  1. Institut Jean Lamour (UMR 7198 CNRS – UL), Labex DAMAS, Parc de Saurupt, CS 50840, 54011, Nancy Cedex, France

    Alain Jacques

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Correspondence to Alain Jacques.

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Manuscript submitted May 8, 2016.

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Jacques, A. From Modeling of Plasticity in Single-Crystal Superalloys to High-Resolution X-rays Three-Crystal Diffractometer Peaks Simulation. Metall Mater Trans A 47, 5783–5797 (2016). https://doi.org/10.1007/s11661-016-3793-z

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