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.
Original language | English |
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Title of host publication | Superalloys 2020 |
Subtitle of host publication | Proceedings of the 14th International Symposium on Superalloys |
Editors | Sammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki |
Publisher | Springer |
Pages | 273-281 |
Number of pages | 9 |
ISBN (Electronic) | 978-3-030-51834-9 |
ISBN (Print) | 9783030518332 |
DOIs | |
Publication status | Published - 2020 |
Publication type | A4 Article in conference proceedings |
Event | International Symposium on Superalloys - Seven Springs, United States Duration: 12 Sept 2021 → 16 Sept 2021 |
Publication series
Name | The Minerals, Metals and Materials Series |
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ISSN (Print) | 2367-1181 |
ISSN (Electronic) | 2367-1696 |
Conference
Conference | International Symposium on Superalloys |
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Country/Territory | United States |
City | Seven Springs |
Period | 12/09/21 → 16/09/21 |
Funding
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.
Keywords
- Dendritic segregations
- Indentation creep
- Micropillar compression
- Ni-based superalloy
Publication forum classification
- Publication forum level 0
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Energy Engineering and Power Technology
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry