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5 Werkstofftechnik

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Autor

  • Agudo Jácome, Leonardo (8) (entfernen)

Erscheinungsjahr

  • 2018 (1)
  • 2015 (2)
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  • Vortrag (7)
  • Posterpräsentation (1)

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  • Deutsch (8) (entfernen)

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  • Creep (1)
  • Electron microscopy (1)
  • Microstructure (1)
  • Multiaxial stress state (1)
  • Superalloy single crystals (1)

Organisationseinheit der BAM

  • 5 Werkstofftechnik (8)
  • 5.1 Materialographie, Fraktographie und Alterung technischer Werkstoffe (8)

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Effect of a circular notch on [001] tensile creep behavior of the Ni-base superalloy single crystal LEK 94 at 1020 °C (2018)
Agudo Jácome, Leonardo
Ni-base superalloy single crystals have been used in turbine blades for hot sections of gas turbines for over four decades. In order to increase the efficiency of the turbines, a continuous increase in the inlet temperature of combustion gases into the turbine has driven the design of turbine blades to complicated shapes and the presence of a complex pattern of cooling channels. These three-dimensional shapes, together with the inhomogeneous distribution of stresses along the blade, induce an also complicated triaxial stress state, which does not compare to uniaxial tests that are performed to characterize high temperature properties such as creep. A round notch on a test piece represents a simple configuration that generates a quasi-isostatic stress state across the notch. In the present contribution, the effect of a sharp round notch on the microstructural micromechanisms within the notched region cylindrical bars, loaded along [001] at 1020 °C and 160 MPa net stress, is studied. To this end, a series of interrupted creep tests is conducted on plain and notched bars and the microstructure is compared. Results are discussed in terms of degree microstructural coarsening, and dislocation activity. The effect of notch generation via grinding is also discussed in these terms. The presence of carbides evolving in from residual carbon is also shown and discussed. .Funding by the German Research Association (DFG) [grant number AG 191/1] is acknowledge
Practical Aspects of 3D Crystalline Defect Analysis for Engineering Materials using Scanning Transmission Electron Microscopy (2013)
Agudo Jácome, Leonardo
Diffraction Contrast in Scanning Transmission Electron Microscopy (STEM) as a Powerful Tool for Quantitative Dislocation Analysis (2014)
Agudo Jácome, Leonardo
Structural Defects in Advanced Alloys and Intermetallics (2013)
Agudo Jácome, Leonardo
Structural Defects in Advanced Alloys and Intermetallics (2013)
Agudo Jácome, Leonardo
Diffraction Contrast in Scanning Transmission Electron Microscopy (STEM) as a Powerful Tool for Quantitative Dislocation Analysis (2014)
Agudo Jácome, Leonardo
Three-Dimensional Characterization of Superdislocation Interactions in the High Temperture and Low Stress Creep Regime of Ni-Base Superalloy Single Crystals (2015)
Agudo Jácome, Leonardo
High Temperature and Low Stress (011)<01-1> Shear Creep Deformation of the Single Crystal Ni-Based Superalloy LEK 94 - elementary softening and deformation processes (2015)
Agudo Jácome, Leonardo
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