5 Werkstofftechnik
Filtern
Erscheinungsjahr
- 2018 (188) (entfernen)
Dokumenttyp
- Zeitschriftenartikel (70)
- Vortrag (68)
- Beitrag zu einem Tagungsband (23)
- Posterpräsentation (23)
- Buchkapitel (2)
- Beitrag zu einem Sammelband (1)
- Sonstiges (1)
Sprache
- Englisch (188) (entfernen)
Schlagworte
- Additive manufacturing (12)
- Additive Manufacturing (10)
- Coarsening (8)
- Creep (8)
- Degradation (8)
- Residual stress (8)
- Fatigue (7)
- Glass (7)
- Alloy 2618A (6)
- Aluminium (6)
- CCUS (6)
- Corrosion (6)
- Crack growth (6)
- High temperature corrosion (6)
- Carbon steels (5)
- Martensitic steel (5)
- Neutron diffraction (5)
- S-phase (5)
- Superaustenite steel (5)
- Supercritical/dense phase CO2 (5)
- Vickers (5)
- Water speciation (5)
- CCS (4)
- Concrete (4)
- DCB (4)
- Damage (4)
- Droplet corrosion (4)
- EBSD (4)
- Hydrogen (4)
- Microplastics (4)
- Microstructure (4)
- Nanoparticles (4)
- Selective laser melting (4)
- Soda-lime silicate glass (4)
- Transmission electron microscopy (4)
- 3D-Printing (3)
- Calcination (3)
- Ceramic (3)
- Coating (3)
- Dark-field transmission electron microscopy (3)
- Ferritic-martensitic steels (3)
- IN718 (3)
- Inconel 686 (3)
- Laser ablation in liquid (3)
- PE-HD (3)
- Powder (3)
- Residual Stresses (3)
- Rotor blade (3)
- SLM (3)
- Selective Laser Melting (3)
- Sintering (3)
- Titanium oxide (3)
- ToF-SIMS (3)
- Wind turbine blades (3)
- 3D printing (2)
- AISI 304L (2)
- Adiabatic calorimeter (2)
- Aging (2)
- Air-coupled ultrasonic testing (2)
- Airborne ultrasonic testing (2)
- Alumina (2)
- Analysis (2)
- Anisotropy (2)
- Austenitic stainless steel (2)
- Bacteria (2)
- Carbon capture (2)
- Carbon dioxide (2)
- Composite (2)
- Composites (2)
- Continnum damage model (2)
- Crystal plasticity (2)
- Crystallization (2)
- Dark-field transmission electron microscopy (DFTEM) (2)
- Destabilization (2)
- Deuterium (2)
- Diffraction contrast (2)
- Diffusion (2)
- Diffusion coefficient (2)
- Dislocation (2)
- Electron microscopy (2)
- Environmental stress cracking (ESC) (2)
- Fatigue of sandwich shell structures (2)
- Ferroelectret (2)
- Foaming (2)
- Glass composition (2)
- High-temperature corrosion (2)
- Impurities (2)
- Injection (2)
- Long-term behavior (2)
- Metal seal (2)
- Microstructure evolution (2)
- Multilayer (2)
- Non-destructive testing (2)
- Particle morphology (2)
- Phase change material (2)
- Plastic deformation (2)
- Polymer (2)
- Porcelain (2)
- Precipitation (2)
- Pressure-assisted sintering (2)
- Reaction-sintering (2)
- Relaxation (2)
- Residual stresses (2)
- Ressidual stress (2)
- Safety assessment (2)
- Salt eutectics (2)
- Scale-bridging (2)
- Scanning transmission electron microscopy (STEM) (2)
- Simulation of concrete (2)
- Spray drying (2)
- Steel (2)
- Sulfidation (2)
- TED-GC-MS (2)
- TEM (2)
- Temperature (2)
- Thermal energy storage (2)
- Thermoelectric oxide (2)
- Thermoelectrics (2)
- Thermogravimetry (2)
- Thermomechanics (2)
- UV-irradiation (2)
- Under cyclic loading (2)
- VSSA (2)
- Virtual experiments (2)
- Viscoplasticity (2)
- Wind turbine (2)
- X-ray laminography (2)
- XANES (2)
- 316L (1)
- 3D glass structure model (1)
- 3D-finite element modeling (1)
- 3D-printing (1)
- 9-12% Cr ferritic-martensitic steels (1)
- Accelerated integration scheme (1)
- Accelerated temporal integration (1)
- Active thermography (1)
- Advanced wastewater treatment (1)
- Ageing (1)
- Aggressive environement (1)
- Aggressive environment (1)
- Aggressive gases (1)
- Al-Cu-Li-alloy (1)
- Al-Li alloys (1)
- Alloy 2818A (1)
- Alloys (1)
- Alumina coatings (1)
- Aluminium alloys (1)
- Aluminum (1)
- Aluminum alloy (1)
- Aluminum alloys (1)
- Amorphization (1)
- Amorphous silica (1)
- Annealing (1)
- Aquifer (1)
- Artefact (1)
- Atomic packing factor (1)
- Austenitic steel (1)
- BTEX (1)
- Biaxial strength (1)
- Bimodal distribution (1)
- Binder jetting (1)
- Bio Ceramic (1)
- Bio Ceramics (1)
- Bioactive glass (1)
- Biodiesel (1)
- Biogeochemistry (1)
- Bioresorbable (1)
- Bitter technique (1)
- Bone regeneration (1)
- Borosilicate glass (1)
- Bravais lattice (1)
- Brittle / ductile fracture behavior (1)
- Brown-rot fungi (1)
- CCUS, supercritical/dense phase CO2, carbon steels, martensitic steel, superaustenite steel, droplet corrosion (1)
- CO2 corrosion (1)
- Calcium Cobaltite (1)
- Calcium cobaltite (1)
- Carbon steels (1)
- Carbon fibre-reinforced-plastics (1)
- Carbon steel (1)
- Carbon storage (1)
- Ccs (1)
- Cement (1)
- Ceramic springs (1)
- Ceramics (1)
- Chemometrics (1)
- Chromatography (1)
- Co2-Storage (1)
- Cobald based alloy (1)
- Complex loading (1)
- Composite structures (1)
- Coniophora puteana (1)
- Coordinate measurement machine (1)
- Corrosion Fatigue (1)
- CrN/NbN (1)
- Crack Propagation (1)
- Crack healing (1)
- Crack propagation (1)
- Crack propagation analysis (1)
- Creep mechanisms (1)
- Creep, Creep Rupture, and Stress Rupture (1)
- Creep-fatigue (1)
- Critical energy release rate (1)
- Crystal Orientation (1)
- Crystallographic texture (1)
- Cupriavidus metallidurans (1)
- Cycle jump (1)
- Cyclic loading (1)
- Cyclic oxidation (1)
- Cyclic softening (1)
- Damage evolution (1)
- Deformation (1)
- Dentine (1)
- Dielectric strength (1)
- Diesel (1)
- Diffraction (1)
- Digital image correlation (1)
- Dissolved water (1)
- Distributed fibre optic sensors (1)
- Dynamic recrystallization (1)
- EDXRD (1)
- EFTEM (1)
- Early stages (1)
- Efficiency (1)
- Electric conductivity (1)
- Electrical resistance (1)
- Electron back-scattered diffraction (1)
- Enamel (1)
- End of life (1)
- Environmentally assisted cracking (1)
- Epoxy resin (1)
- Expanding cavity model (1)
- FCH JU (1)
- FIB Tomography (1)
- Failure rate (1)
- Fatigue crack propagation (1)
- Fatigue damage (1)
- Fatigue fracture (1)
- Fatigue of sandwich structures (1)
- Femtosecond laser (1)
- Fiber-matrix interface (1)
- Filters (1)
- Finland (1)
- Flow Coefficient (1)
- Fluoride nanoparticles (1)
- Fluorolytic sol−gel (1)
- Fourier series (1)
- Fourier transform infrared spectroscopy (1)
- Fracture mechanics (1)
- Friction (1)
- Friction stir processing (1)
- Full Notch Creep Test (FNCT) (1)
- Full notch creep test (FNCT) (1)
- Fungi (1)
- GMR (1)
- GMR sensors (1)
- Gasabgabe (1)
- Gasgehalt (1)
- Geometrical factors (1)
- Geopolymers (1)
- Geothermal (1)
- Glas (1)
- Glass capillaries (1)
- Glass crystallization stress (1)
- Glass fiber reinforced polymers (1)
- Glass transition (1)
- Glass-ceramics definition (1)
- Gold (1)
- Grade S960QL steel (1)
- Gradient-enhanced fatigue model (1)
- Grain Boundary Corrosion (1)
- Grain boundaries (1)
- Granules (1)
- Graphite (1)
- Heat treatment (1)
- High - temperature corrosion (1)
- High Cycle Fatigue (1)
- High Temperature Corrosion (1)
- High interstitial austenitic steel (1)
- High temperature (1)
- Hipims (1)
- Horizon 2020 (1)
- Hot Press (1)
- Hot isostatic pressing (HIP) (1)
- Hydrogen permeability (1)
- Hydrogen permeation (1)
- Hydrogen storage (1)
- Imaging techniques (1)
- Impact wear (1)
- Implant failures (1)
- In situ (1)
- In situ diffraction (1)
- In-situ (1)
- In-situ SEM micro shear deformation (1)
- In718 (1)
- Inconel 625 (1)
- Inconel 686 coating (1)
- Indentation (1)
- Indentation hardness (1)
- Initial attachment (1)
- Interdiffusion (1)
- Interface (1)
- Interfacial shear strength (1)
- Internal Sulfidation (1)
- Internal friction (1)
- Inverse ostwald ripening (1)
- Kikuchi pattern (1)
- Laboratory X-ray diffraction (1)
- Laser (1)
- Laser Cladding (1)
- Laser cladding (1)
- Laser curing (1)
- Laser scanning microscopy (LSM) (1)
- Lattice parameters (1)
- Lifetime prediction (1)
- Light curing (1)
- Lightweight materials (1)
- Limestone Filler (1)
- Log-normal distribution (1)
- Long-term calculation (1)
- Long-term storage (1)
- Low Cycle Fatigue (LCF) (1)
- Low carbon steel (1)
- Low cycle fatigue (1)
- Magnetic domain distribution (1)
- Magnetic stray field (1)
- Magnetic stray fields (1)
- Magnetomechanical effect (1)
- Manufacturing (1)
- Mars (1)
- Martensite (1)
- Martensitic steel (1)
- Martensitic transformation (1)
- Mass transport (1)
- Master curve (1)
- Material characterization (1)
- Material defects (1)
- Material modeling (1)
- Material oxidation (1)
- Mechanical and thermal testing (1)
- Metal Magnetic Memory (1)
- Metal magnetic memory (1)
- Metallic components (1)
- Metformin (1)
- Micro-shrinkages (1)
- Micromechanical model (1)
- Microsegregation (1)
- Microstructur (1)
- Microstructural evolution (1)
- Microstructure and texture (1)
- Microwave technology (1)
- Mikroplastik (1)
- Misorientation (1)
- Mobility (1)
- Modeling (1)
- Molecular dynamics (1)
- Multiaxial deformation (1)
- Multilayer technology (1)
- NGS (1)
- Nano-powder characterization (1)
- Nano-scratch test (1)
- Nanomaterial screening (1)
- Nanoparticle structure (1)
- Nanoscale multilayers (1)
- Natural silver wires (1)
- Near Infrared Spectroscopy (1)
- NiTi (1)
- Nickel based coatings (1)
- Nickel-base superalloy (1)
- Nickel-base superalloys (1)
- Notch (1)
- Number density (1)
- Optical backscatter reflectometry (1)
- Optical centrifugation (1)
- Optical fibre (1)
- Orientation (1)
- Orientation refinement (1)
- Oxidation (1)
- Oxide coatings (1)
- Oxide scale (1)
- Oxyfuel (1)
- P92 steels (1)
- PLS-DA (1)
- PV modules (1)
- Particle Size Distribution (1)
- Passive components and circuits (1)
- Permeability (1)
- Phase field simulation (1)
- Phase-field (1)
- Photocatalysis (1)
- Photocleavable organosilanes (1)
- Photopolymer composites (1)
- Phototrophs (1)
- Photovoltaic modules (1)
- Phytolith (1)
- Pipeline (1)
- Polyaniline (1)
- Polymer matrix composites (1)
- Polymeric Materials (1)
- Polypropylene (1)
- Polystyrene (1)
- Porosity (1)
- Powdered activated carbon (1)
- Power factor (1)
- Preceramic polymer (1)
- Production scatter (1)
- Pull-out composite materials (1)
- Rafting (1)
- Raman spectroscopy (1)
- Real-time qPCR (1)
- Reference Material (1)
- Relaxation tests (1)
- Relaxationsphänomene (1)
- Resistance stress (1)
- Rheology (1)
- Rhodonia placenta (1)
- Risswachstum (1)
- Roughness (1)
- S-Phase (1)
- SEM (1)
- SEM wood characterization (1)
- SIMS (1)
- Sand blasting (1)
- Sandwich (1)
- Scanning acoustic microscopy (SAM) (1)
- Scanning electron microscopy (1)
- Segregation (1)
- Self-Assembly (1)
- Sewage treatment plant (1)
- Shape memory alloys (1)
- Shear load (1)
- Shear testing (1)
- SiO2 (1)
- Silicate Glasses (1)
- Silicatglas (1)
- Silicon Carbide (1)
- Single crystal superalloys (1)
- Single fiber pull-out test (1)
- Single-crystals (1)
- Sinter additive (1)
- Sliding simulation (1)
- Slow crack growth (SCG) (1)
- Slurry optimization (1)
- Soil (1)
- Soil sample (1)
- Solar panels (1)
- Solid-State-Synthesis (1)
- Solid-state-synthesis (1)
- Sorption (1)
- Steam oxidation resistance (1)
- Steel P92 (1)
- Stereoscopy (1)
- Strain difference (1)
- Stress-strain-behavior (1)
- Structural health monitoring (SHM) (1)
- Structural steel (1)
- Structured heating (1)
- Subsurface defects (1)
- Sulphidation (1)
- Superalloy single crystals (1)
- Superaustenite steel (1)
- Superconducting magnet (1)
- Supercritical/dense phase CO 2 (1)
- Support configurations (1)
- Support vector machines (1)
- Surface Nucleation (1)
- Surface modification (1)
- Surface nucleation (1)
- Swept wavelength interferometry (SWI) (1)
- Synchrotron X-ray diffraction (1)
- T1 precipitate (1)
- TAHYA (1)
- TED (1)
- TIG-welding (1)
- Texturation (1)
- Thermal degradation (1)
- Thermal expansion (1)
- Thermo-mechanical fatigue (1)
- Thermo-mechanical loading (1)
- Thermoanalysis (1)
- Thermoanalytical Methods (1)
- Thermoelectric generator (1)
- Thermoelectric oxides (1)
- Thermomechanical Fatigue (TMF) (1)
- Thickening (1)
- Thin tribofilm (1)
- Titanium (1)
- Tooth wear (1)
- Topography (1)
- Transducers (1)
- Transmittance (1)
- Tricalcium Phosphate (1)
- Ultrasound (1)
- VCSEL (1)
- Vacancies (1)
- Very high cycle fatigue (1)
- Vickers indentation (1)
- Visualization (1)
- Volume Fraction (1)
- Volume fraction (1)
- Wasser (1)
- Waste water (1)
- Water (1)
- Water droplet erosion resistance (1)
- Withstand voltage tests (1)
- Wood protection (1)
- X-ray computed tomography (CT) (1)
- X-ray refractography (1)
- XRD (1)
- Young`s modulus (1)
- laser cladding (1)
Organisationseinheit der BAM
- 5 Werkstofftechnik (188)
- 5.1 Mikrostruktur Design und Degradation (60)
- 5.2 Metallische Hochtemperaturwerkstoffe (40)
- 5.3 Polymere Verbundwerkstoffe (29)
- 5.4 Multimateriale Fertigungsprozesse (28)
- 5.6 Glas (28)
- 7 Bauwerkssicherheit (23)
- 8 Zerstörungsfreie Prüfung (21)
- 9 Komponentensicherheit (21)
- 5.5 Materialmodellierung (20)
Eingeladener Vortrag
- nein (68)
3D structural investigations are described by X-ray laminography studies of sandwich shell segments, made of a PVC foam core, covered by non-crimp fabric glass fibre composite lay-ups processed by vacuum assisted resin infusion of epoxy. The specific scope of this study is to image transversal flaws within the foam core (joints) and of single ply overlaps. Test flaws were purposely implemented in order to simulate typical failure under cyclic load. In a dedicated test rig for shell structures, the flaw evolution/propagation is monitored by thermography and optical 3D inspection of deformation. Due to the unfavourable preconditions for classical computed tomography as of large aspect ratio, the samples were investigated by coplanar translational laminography. Its limited range of observation angles of ± 45°, results in anisotropic artefacts about the normal to the sample surface, but the typical flaws are well visualized in the as-prepared state, in a state of early damage, and in the repaired state.
3D structural investigations are described by X-ray laminography studies of sandwich shell segments, made of a PVC foam core, covered by non-crimp fabric glass fibre composite lay-ups processed by vacuum assisted resin infusion of epoxy. The specific scope of this study is to image transversal flaws within the foam core (joints) and of single ply overlaps. Test flaws were purposely implemented in order to simulate typical failure under cyclic load. In a dedicated test rig for shell structures, the flaw evolution/propagation is monitored by thermography and optical 3D inspection of deformation. Due to the unfavourable preconditions for classical computed tomography as of large aspect ratio, the samples were investigated by coplanar translational laminography. Its limited range of observation angles of ± 45°, results in anisotropic artefacts about the normal to the sample surface, but the typical flaws are well visualized in the as-prepared state, in a state of early damage, and in the repaired state.
Abstract While classically used to visualise the magnetic microstructure of functional materials (e.g., for magnetic applications), in this study, the Bitter technique was applied for the first time to visualise macroscopic deformation gradients in a polycrystalline low-carbon steel. Spherical indentation was chosen to produce a multiaxial elastic–plastic deformation state. After removing the residual imprint, the Bitter technique was applied, and macroscopic contrast differences were captured in optical microscopy. To verify this novel characterisation technique, characteristic “hemispherical” deformation zones evolving during indentation were identified using an analytical model from the field of contact mechanics. In addition, near-surface residual stresses were determined experimentally using synchrotron radiation diffraction. It is established that the magnetic domain distribution contrast provides deformation-related information: regions of different domain wall densities correspond to different “hemispherical” deformation zones (i.e., to hydrostatic core, plastic zone and elastic zone, respectively). Moreover, the transitions between these three zones correlate with characteristic features of the residual stress profiles (sign changes in the radial and local extrema in the hoop stress). These results indicate the potential of magnetic domain distribution imaging: visualising macroscopic deformation gradients in fine-grained ferromagnetic material with a significantly improved spatial resolution as compared to integral, mean value-based measurement methods.
Virtual-lab-based determination of a macroscopic yield function for additively manufactured parts
(2018)
This work presents a method for the yield function determination of additively manufactured parts of S316L steel. A crystal plasticity model is calibrated with test results and used afterwards to perform so-called virtual experiments, that account for the specific process-related microstructure including crystallographic and morphological textures. These simulations are undertaken on a representative volume element (RVE), that is generated from EBSD/CT-Scans on in-house additively manufactured specimen, considering grain structure and crystal orientations. The results of the virtual experiments are used to determine an anisotropic Barlat yield function, that can be used in a macroscopical continuum-sense afterwards. This scale-bridging approach enables the calculation of large-scale parts, that would be numerically too expensive to be simulated by a crystal plasticity model.
Virtual-lab-based determination of a macroscopic yield function for additively manufactured parts
(2018)
This work presents a method for the yield function determination of additively manufactured parts of S316L steel. A crystal plasticity model is calibrated with test results and used afterwards to perform so-called virtual experiments, that account for the specific process-related microstructure including crystallographic and morphological textures. These simulations are undertaken on a representative volume element (RVE), that is generated from EBSD/CT-Scans on in-house additively manufactured specimen, considering grain structure and crystal orientations. The results of the virtual experiments are used to determine an anisotropic Barlat yield function, that can be used in a macroscopical continuum-sense afterwards. This scale-bridging approach enables the calculation of large-scale parts, that would be numerically too expensive to be simulated by a crystal plasticity model.
Der Vortrag gibt eine Einführung in die Methode der Vakuumheißextraktion und beschreibt die Anwendungsmöglichkeiten der an der BAMN betriebenen Anlage.
During the energy transformation from fossil fuels to renewable energy sources, the use of hydrogen as fuel and energy storage can play a key role. This presents new challenges to industry and the scientific community alike. The storage and transport of hydrogen, which is nowadays mainly realized by austenitic stainless steels, remains problematic, which is due to the degradation of mechanical properties and the possibility of phase transformation by hydrogen diffusion and accumulation. The development of materials and technologies requires a fundamental understanding of these degradation processes. Therefore, studying the behavior of hydrogen in austenitic steel contributes to an understanding of the damage processes, which is crucial for both life assessment and safe use of components in industry and transportation. As one of the few tools that is capable of depicting the distribution of hydrogen in steels, time-of-flight secondary ion mass spectrometry was conducted after electrochemical charging. To obtain further information about the structural composition and cracking behavior, electron-backscattered diffraction and scanning electron microscopy were performed. Gathered data of chemical composition and topography were treated employing data fusion, thus creating a comprehensive portrait of hydrogen-induced effects in the austenite grade AISI 304L. Specimens were electrochemically charged with deuterium instead of hydrogen. This arises from the difficulties to distinguish between artificially charged hydrogen and traces existing in the material or the rest gas in the analysis chamber. Similar diffusion and permeation behavior, as well as solubility, allow nonetheless to draw conclusions from the experiments.
Glass-ceramics are noted for their unusual combination of properties and manifold commercialized products for consumer and specialized markets. Evolution of novel glass and ceramic processing routes, a plethora of new compositions, and unique exotic nano- and microstructures over the past 60 years led us to review the Definition of glass-ceramics. Well-established and emerging processing methods, such as co-firing, additive manufacturing, and laser patterning are analyzed concerning the core requirements of processing glass-ceramics and the Performance of the final products. In this communication, we propose a revised, updated definition of glass-ceramics, which reads “Glass-ceramics are inorganic, non-metallic materials prepared by controlled crystallization of glasses via different processing methods. They contain at least one type of functional crystalline phase and a residual glass. The volume fraction crystallized may vary from ppm to almost 100%”.
Commercial grade-1 titanium samples (Ti, 99.6%) were treated using three alternative methods, (i) femtosecond laser processing, (ii) thermal heat treatment, and (iii) electrochemical anodization, respectively, resulting in the formation of differently conditioned superficial titanium oxide layers. The laser processing (i) was carried out by a Ti:sapphire laser (pulse duration 30 fs, central wavelength 790 nm, pulse repetition rate 1 kHz) in a regime of generating laser-induced periodic surface structures (LIPSS). The experimental conditions (laser fluence, spatial spot overlap) were optimized in a sample-scanning setup for the processing of several square-millimeters large surface areas covered homogeneously by these nanostructures. The differently oxidized titanium surfaces were characterized by optical microscopy, micro Raman spectroscopy, variable angle spectroscopic ellipsometry, and instrumented indentation testing. The tribological performance was characterized in the regime of mixed friction by reciprocating sliding tests against a sphere of hardened steel in fully formulated engine oil as lubricant. The specific tribological performance of the differently treated surfaces is discussed with respect to possible physical and chemical mechanisms.