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- 2010 (8) (entfernen)
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- Vortrag (5)
- Zeitschriftenartikel (2)
- Posterpräsentation (1)
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- Analyser based imaging (1)
- Creep damage (1)
- Fatigue (1)
- Low-cycle fatigue (1)
- Metal matrix composite (MMC) (1)
- Nickel-base superalloys (1)
- Porosity (1)
- Prior exposure (1)
- Rafting (1)
- Synchrotron radiation (1)
Eingeladener Vortrag
- nein (5)
Microstructural aspects of composites such as reinforcement particle size, shape, and distribution play important roles in deformation behavior. In addition, Fe-rich inclusions and porosity also influence the behavior of these composites, particularly under fatigue loading. Three-dimensional (3-D) visualization of porosity and Fe-rich inclusions in three dimensions is critical to a thorough understanding of fatigue resistance of metal matrix composites (MMCs), because cracks often initiate at these defects. In this article, we have used X-ray synchrotron tomography to visualize and quantify the morphology and size distribution of pores and Fe-rich inclusions in a SiC particle-reinforced 2080 Al alloy composite. The 3-D data sets were also used to predict and understand the influence of defects on the deformation behavior by 3-D finite element modeling.
Der Beitrag der BAM zur Sicherheitstechnik am Beispiel der Schadensanalyse von Eisenbahnkomponenten
(2010)
Creep damage of single-crystal nickel base superalloys: mechanisms and effect on low cycle fatigue
(2010)
The main mechanisms of creep damage of single-crystal nickel-base superalloys are the loss of the interface coherency, coarsening of the γ / γ'-microstructure, precipitation of topologically closed packed phases and growth of porosity. This degradation deteriorates the mechanical properties such as yield stress, creep lifetime and especially low-cycle fatigue life, which can be reduced nearly by a factor of 10. The degradation kinetics during creep was characterised quantitatively on the superalloy CMSX-4. A new non-destructive testing technique was applied to cover a wide test parameter range with few specimens in a relatively short time: repeated load annealing of wedge shaped specimens.