Innovative Material Testing Based on Small-Scale Specimens and Application for Turbomachinery Components
Abstract
Material characterization is usually based on standard specimen testing. In contrast, small-scale specimens require less testing material and offer additional advantages like investigation of size effects with impact on material properties (specimen diameter equivalent to wall thickness of buckets and liners) and testing of samples of virgin or service-exposed turbomachinery components. The paper highlights the small-scale specimen test setup and its application for LCF- and HCF-testing. Innovative small-scale specimen testing with close-to-component structural features enables direction dependent and spatially resolved determination of material characteristics. Cast and forged gas turbine nickel-based alloys and a typical steam turbine steel are the materials of interest in this study. Substrate temperature levels ranges from room temperature up to 1000 °C. Test system, radiation heating, instrumentation and two types of small-scale specimen geometries according to German standard DIN 50100 will be presented. Benefits and limitations of application of small-scale specimens will be discussed. Finally the authors report about application of small-scale specimen testing for remaining life time determination of service exposed gas turbine buckets. Small-scale specimens have been directly extracted from a gas turbine. Bucket root material (conventionally cast nickel-base alloy IN738) and literature data serve as reference base for initial state of the material. Tensile and LCF te…
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AM exhibits slightly lower mechanical properties than forged parts.
“Although AM exhibits slightly lower mechanical properties than forged parts [132,133], this process resolves many machining issues.”
From Towards Sustainability in Hydraulic Machinery Manufacturing by 3D Printing (2024) · cites this paper as [132]
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Towards Sustainability in Hydraulic Machinery Manufacturing by 3D Printing
Remache, A., Pérez-Sánchez, M., Hidalgo, V. H., Ramos, H. M., & Sánchez-Romero, F.-J. (2024) · Processes · doi:10.3390/pr12122664 · Cited by 9 · see citing works
- Authors
- Raddatz, M., Holländer, D., & Gampe, U.
- Affiliations
- Technische Universität Dresden (DE)
- Venue
- Volume 7A: Structures and Dynamics
- Published
- 2017-06-26
- OpenAlex
- W2747349005
- Cited by
- 3
- References
- 0
- Citations by year
- 2025: 1 · 2024: 1 · 2019: 1
- FWCI
- 0.64
- Type
- conference paper
- Language
- en
- Open access
- closed
- Funders
- Vattenfall
- European Commission
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › High Temperature Alloys and Creep
- Physical Sciences › Engineering › Mechanics of Materials › Fatigue and fracture mechanics
- Physical Sciences › Engineering › Mechanical Engineering › Mechanical and Thermal Properties Analysis
- Keywords
- size effect, low cycle fatigue, high cycle fatigue, turbomachinery components, nickel-based alloys, IN738, remaining useful life prediction, radiative heating, tensile testing
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