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Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests

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Superalloys 2020

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

Chemical inhomogenities due to dendritic solidification of Ni-based superalloys result in different local microstructures with varying mechanical properties. New indentation creep test methods allow probing of the local creep properties at the dendrite scale at high temperatures. The as-cast single crystalline Ni-based superalloy ERBO1A (a derivative alloy of CMSX–4) was investigated and electron-probe microanalysis (EPMA) measurements revealed strong segregation of, e.g., Re and W in the dendritic region and, e.g., Ta in the interdendritic region. Indentation creep experiments at 750 °C and micropillar compression tests at 785 °C were conducted in both regions, and a higher creep strength was found in the dendritic region compared to the interdendritic region. Theoretical models for solid solution hardening as well as γ′ precipitation hardening confirm these results, since they predict a higher strength in the dendritic region than in the interdendritic region. Compared with the fully heat treated state, a smaller difference in the local mechanical properties or even a reverse strength ratio of the dendritic and interdendritic region can be expected.

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Acknowledgements

The authors gratefully acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) through projects A6 of the Collaborative Research Center SFB/TR 103 “From Atoms to Turbine Blades—a Scientific Approach for Developing the Next Generation of Single Crystal Superalloys” and thank S. Giese and C. Schunk from the Institute I: General Materials Properties at FAU for their support for milling the micropillars. Furthermore, the authors thank Siwen Gao from the Interdisciplinary Center for Advanced Materials Simulation of the Ruhr University Bochum for the FE simulation image.

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Authors and Affiliations

  1. Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Materials Science & Engineering, Institute I: General Materials Properties, Martensstr.5, 91058, Erlangen, Germany

    Lukas Haußmann, Steffen Neumeier, Markus Kolb & Mathias Göken

  2. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstraße 39, 3602, Thun, Switzerland

    Johannes Ast, Gaurav Mohanty & Johann Michler

  3. Fraunhofer-Institut für Keramische Technologien und Systeme IKTS, Korrelative Mikroskopie und Materialdaten, Äußere Nürnberger Strasse 62, 91301, Forchheim, Germany

    Johannes Ast

  4. Tampere University, Materials Science and Environmental Engineering, 33014, Tampere, Finland

    Gaurav Mohanty

Authors
  1. Lukas Haußmann
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  2. Steffen Neumeier
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  3. Markus Kolb
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  4. Johannes Ast
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  5. Gaurav Mohanty
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  6. Johann Michler
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  7. Mathias Göken
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Corresponding author

Correspondence to Lukas Haußmann .

Editor information

Editors and Affiliations

  1. Illinois Institute of Technology, Chicago, IL, USA

    Sammy Tin

  2. Rolls-Royce, Derby, UK

    Mark Hardy

  3. PCC Structurals, Portland, OR, USA

    Justin Clews

  4. ISAE-ENSMA, Chasseneuil-du-Poitou, France

    Jonathan Cormier

  5. University of Science and Technology, Beijing, China

    Qiang Feng

  6. Collins Aerospace, Windsor Locks, CT, USA

    John Marcin

  7. ATI Specialty Materials, Monroe, NC, USA

    Chris O'Brien

  8. GE Global Research, Niskayuna, NY, USA

    Akane Suzuki

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Haußmann, L. et al. (2020). Local Mechanical Properties at the Dendrite Scale of Ni-Based Superalloys Studied by Advanced High Temperature Indentation Creep and Micropillar Compression Tests. In: Tin, S., et al. Superalloys 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-51834-9_26

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