Filtern
Erscheinungsjahr
Dokumenttyp
- Zeitschriftenartikel (49)
- Beitrag zu einem Tagungsband (6)
- Vortrag (4)
- Posterpräsentation (3)
Schlagworte
- Additive manufacturing (34)
- Residual stress (22)
- Neutron diffraction (10)
- Synchrotron X-ray diffraction (10)
- Computed tomography (9)
- Laser powder bed fusion (8)
- Ti-6Al-4V (8)
- Selective laser melting (7)
- Additive Manufacturing (5)
- IN718 (4)
- X-ray computed tomography (4)
- Electron beam melting (3)
- Metal matrix composite (3)
- Neutron Diffraction (3)
- Residual Stress (3)
- Damage (2)
- Diffraction elastic constants (2)
- Eigenspannungen (2)
- Inconel 718 (2)
- LPBF (2)
- Load partition (2)
- Metal Matrix Composites (2)
- Micromechanics (2)
- Microstructure and texture (2)
- Process atmosphere (2)
- Residual stress analysis (2)
- SLM (2)
- Synchrotron CT (2)
- Texture (2)
- Ti-Nb alloy (2)
- X-ray diffraction (2)
- AISI 316L (1)
- Additive Fertigung (1)
- Aluminum alloys (1)
- Anisotropy (1)
- Annealing treatment (1)
- As-built LPBF IN718 alloy (1)
- Average phase stress concentrations (1)
- Binder Jetting (1)
- Biomaterials (1)
- Bitter technique (1)
- Computed Tomography (1)
- Contour scan strategy (1)
- Coordinate measurement machine (1)
- Crack propagation (1)
- Deep learning segmentation (1)
- Deformation (1)
- Deviatoric (1)
- Diffraction (1)
- Diffraction-elastic constants (1)
- Distortion (1)
- Distortion upon baseplate removal (1)
- Effect of scanning strategies (1)
- Effective properties (1)
- Elastic constants (1)
- Electron back-scattered diffraction (1)
- Electron beam powder bed fusion (1)
- Electron microscopy (1)
- Expanding cavity model (1)
- FEM (1)
- FEM Simulation (1)
- Fatigue performance (1)
- Fiber-reinforced composite (1)
- Finite element method (1)
- Functionally graded porous structure (1)
- Gyroid lattice (1)
- Heat treatment (1)
- Helium (1)
- Homogenization (1)
- Hot isostatic pressing (1)
- Hybrid manufacturing (1)
- Imaging (1)
- In situ alloying (1)
- In-situ monitoring (1)
- In-situ neutron diffraction (1)
- In718 (1)
- Inconel (1)
- Indentation (1)
- Intergranular strain (1)
- Intermetallics (1)
- Internal stress (1)
- Interphase residual stress (1)
- Kernel average misorientation (1)
- L-PBF IN718 material (1)
- Laboratory X-ray diffraction (1)
- Laboratory energy-dispersive X-ray diffraction (EDXRD) (1)
- Laser Powder Bed Fusion (1)
- Laser beam melting (1)
- Laser methods (1)
- Laser-based additive manufacturing (1)
- Lattice Structure (1)
- Lattice structures (1)
- Lightweight structures (1)
- Load Partition (1)
- Load transfer (1)
- MMC (1)
- Macroscopic stress (1)
- Magnetic domain distribution (1)
- Magnetic stray field (1)
- Mechanical behavior (1)
- Melt pool monitoring (1)
- Metal matrix composites (1)
- Metamaterials (1)
- Micromechanical modeling (1)
- Multi-phase (1)
- Nanostructured powder (1)
- Near-surface X-ray diffraction (1)
- Neutron and X-ray diffraction (1)
- Neutronenstreuung (1)
- Nickel-based superalloy (1)
- Nickel-based superalloys (1)
- Non-destructive testing (1)
- Non-weldable superalloy (1)
- Online Process Monitoring (1)
- Orientation distribution (1)
- PBFLB/M AlSi10Mg alloy (1)
- Piston alloy (1)
- Powder analysis (1)
- Powder bed fusion Laser beam (1)
- Powder methods (1)
- Powder removal (1)
- Quality control (1)
- Reinforced concrete (1)
- Residual Stresses (1)
- Residual powder removal (1)
- Residual stress in AM (1)
- Residual stress state (1)
- Residual stresses (1)
- Roughness analysis (1)
- Scaffold (1)
- Scan strategies (1)
- Scan strategy influence (1)
- Selective Laser Melting (1)
- Selektive Laserschmelzen (1)
- Selektives Laserschmelzen (1)
- Sintering (1)
- Solidification cracking (1)
- Strain-free lattice references (1)
- Strain-free lattice spacing (1)
- Strengthening mechanisms (1)
- Stress balance (1)
- Stress balance condition (1)
- Stress concentration tensor (1)
- Stress-relief heat-treatments (1)
- Surface roughness (1)
- Synchrotron X-ray CT (1)
- Synchrotron X-ray computed tomography (1)
- Synchrotron X-ray diffraction (SXRD) (1)
- Synchrotron computed tomography (1)
- Synchrotronbeugung (1)
- TIG welding (1)
- TPMS structures (1)
- Thermography (1)
- Ti6Al4V alloy (1)
- Tiatanium (1)
- Triply periodic minimal surface structures (1)
- VHCF (1)
- WAAM (1)
- Wear resistance (1)
- Wärmebehandlung (1)
- X-ray CT (1)
- X-ray Computed Tomography (1)
- X-ray Diffraction (1)
- X-ray analysis (1)
- X-ray and neutron diffraction (1)
- Yield strength (1)
- Zirconium (1)
- metal matrix composite (1)
- multiphase composite (1)
Organisationseinheit der BAM
- 8 Zerstörungsfreie Prüfung (52)
- 8.5 Röntgenbildgebung (51)
- 9 Komponentensicherheit (14)
- 9.4 Integrität von Schweißverbindungen (14)
- 5 Werkstofftechnik (10)
- 5.0 Abteilungsleitung und andere (6)
- 9.2 Versuchsanlagen und Prüftechnik (3)
- 5.1 Mikrostruktur Design und Degradation (2)
- 5.2 Metallische Hochtemperaturwerkstoffe (2)
- 8.3 Thermografische Verfahren (2)
Eingeladener Vortrag
- nein (4)
As opposed to reviewing results on experimental determination of residual stress by diffraction, this paper discusses the open issues when dealing with residual stress determination in additive manufactured parts, in particular those manufactured with laser powder bed fusion techniques. Three points are addressed in detail: (a) the proper determination of the strain-free reference d0, (b) the problem of the determination of the principal axes, and (c) the use of the correct diffraction elastic constants. It is shown that all methods to determine the strain-free reference d0 suffer from caveats, and care must be taken in evaluating the most suitable for the problem being tackled. In addition, it is shown that, in some systems, the principal axes do correspond to the geometrical axes of the specimen, but this needs to be systematically checked, especially in the case of uni- or bidirectional hatching strategies. Finally, the need to experimentally determine the proper diffraction elastic constants is underlined, especially in the case of strongly textured specimens, which again depends on the deposition strategy.
The quality of components made by laser beam melting (LBM) additive manufacturing is naturally influenced by the quality of the powder bed. A packing density <1 and porosity inside the powder particles lead to intrinsic voids in the powder bed. Since the packing density is determined by the particle size and shape distribution, the determination of these properties is of significant interest to assess the printing process. In this work, the size and shape distribution, the amount of the particle’s intrinsic porosity, as well as the packing density of micrometric powder used for LBM, have been investigated by means of synchrotron X-ray computed tomography (CT). Two different powder batches were investigated: Ti–6Al–4V produced by plasma atomization and stainless steel 316L produced by gas atomization. Plasma atomization particles were observed to be more spherical in terms of the mean anisotropy compared to particles produced by gas atomization. The two kinds of particles were comparable in size according to the equivalent diameter. The packing density was lower (i.e., the powder bed contained more voids in between particles) for the Ti–6Al–4V particles. The comparison of the tomographic results with laser diffraction, as another particle size measurement technique, proved to be in agreement.