5 Werkstofftechnik
Filtern
Erscheinungsjahr
- 2024 (60) (entfernen)
Dokumenttyp
- Vortrag (39)
- Zeitschriftenartikel (9)
- Posterpräsentation (6)
- Dissertation (3)
- Forschungsdatensatz (2)
- Beitrag zu einem Tagungsband (1)
Sprache
- Englisch (51)
- Deutsch (8)
- Mehrsprachig (1)
Referierte Publikation
- nein (60) (entfernen)
Schlagworte
- Additive Manufacturing (10)
- Microstructure (6)
- Ontology (6)
- Additive Fertigung (3)
- Ceramic (3)
- Creep (3)
- Digitalization (3)
- Nano powder (3)
- Plattform Material Digital (3)
- Semantic Data (3)
- Simulation (3)
- Slurry (3)
- VSSA (3)
- 316L (2)
- AGIL (2)
- Advanced ceramics (2)
- Data Interoperability (2)
- Data Space (2)
- Data Structures (2)
- Diffraction Elastic Constants (2)
- EBSD (2)
- Electron Backscatter Diffraction (2)
- Electronic Lab Notebook (2)
- FAIR (2)
- Fatigue crack growth (2)
- Fluoride phosphate glasses (2)
- Gender gap (2)
- Glass (2)
- Glass Digital (2)
- Kikuchi (2)
- Kriechen (2)
- LCF (2)
- LSD-print (2)
- Laser Powder Bed Fusion (2)
- Laser Powder Bed fusion (2)
- Lattice parameters (2)
- Layerwise slurry deposition (2)
- Mechanical testing (2)
- Mikrostruktur (2)
- Nanopulver (2)
- OECD TG 124 (2)
- Ontologie (2)
- Plattform MaterialDigital (2)
- Ratio refinement (2)
- Research Data Management (2)
- Robotic melting (2)
- Scintillators (2)
- Semantic Interoperability (2)
- Semantic Web Technologies (2)
- Tensile Test Ontology (2)
- Two Photon Polymerization (2)
- Workflow (2)
- AISI 316L (1)
- Additive manufactured Ni-base superalloys (1)
- Additive manufacturing (1)
- Austenitic cast iron (1)
- Austenitischer Stahl (1)
- BET (1)
- Binder jetting (1)
- Bioactive (1)
- CALPHAD (1)
- CdTe quantum dots (1)
- Composite materials (1)
- Computed Tomography (1)
- Concrete 3D-printing (1)
- Copper alloys (1)
- Coulomb explosion (1)
- CrCoNi (1)
- CrMnFeCoNi (1)
- Crystal plasticity (1)
- Crystallization (1)
- Data Exchange (1)
- Data Integration (1)
- Data Management (1)
- Data Mapping (1)
- Dataset (1)
- Degradation (1)
- Demonstrators (1)
- Density (1)
- Density-based Model (1)
- Design of experiment (1)
- Diffraction (1)
- Digital Transformation (1)
- Digital Twin (1)
- Digtial Representation (1)
- Disordered assemblies (1)
- EPR (1)
- Elctronic Lab Notebook (1)
- Electron beam-induced fragmentation (1)
- Electron microscopy (1)
- FAIR Data (1)
- FNCT (1)
- FT-IR (1)
- Female noble prize winners (1)
- Finite-Elemente-Methode (1)
- Foaming (1)
- Full-Notch Creep Test (1)
- Functional fatigue (1)
- Fused Filament Fabrication (1)
- Gd3+ (1)
- Gefüge (Werkstoffkunde) (1)
- Glas (1)
- Glass scintillator (1)
- Glasses (1)
- Gold nanoparticle synthesis (1)
- Grain boundary engineering (1)
- Granulometrie (1)
- Grenzflächenenergie (1)
- HEA (1)
- Heat treatment (1)
- High energy radiation (1)
- High entropy alloy (1)
- High entropy alloys (1)
- Hochentropielegierung (1)
- Host-guest hybrid materials (1)
- In situ synthesis (1)
- In-Situ Testing (1)
- Interoperability (1)
- Joined nickel-based alloys (1)
- Knowledge Graph (1)
- Knowledge Representation (1)
- Knowledge graph and ontologies (1)
- Kristallorientierung (1)
- Laser (1)
- Laser-Pulverbettschmelzen (1)
- Localized plasmons (1)
- Lorenz transmission electron microscopy (1)
- Low-cycle fatigue. (1)
- MEA (1)
- Material Life Cycle (1)
- Materials and Processes Data Reusability (1)
- Mechanical Properties (1)
- Mechanische Eigenschaften (1)
- Medium entropy alloy (1)
- Mehrskalenmodell (1)
- Microstructure Analysis (1)
- Microstructure Design (1)
- Mikrostrukturentwicklung (1)
- Multifunctional nanoparticles (1)
- NIST (1)
- Ni-Mn-Ga (1)
- Ni-Resist (1)
- Non-Destructive Testing (1)
- Normung (1)
- OECD TG (1)
- Oberflächenkeimbildung (1)
- Ontologies (1)
- Optical properties of glasses and ceramics (1)
- Oriented surface crystallization (1)
- PBF-LB/M/316L (1)
- Particle-bed binder jetting (1)
- Partikelgröße (1)
- Persistent luminescent (1)
- Phosphors (1)
- Pycnometry (1)
- Radiation-matter interaction (1)
- Raman (1)
- Real time growth control (1)
- Residual Stress (1)
- Reusability (1)
- Robotic glass melting (1)
- Robotische Schmelzanlage (1)
- Scanning electron microscopy (1)
- Segregation Engineering (1)
- Semantic web (1)
- Semantische Daten (1)
- Shape-memory alloys (1)
- Single crystal (1)
- Specific surface (1)
- Spectroscopy (1)
- Spezifische Oberfläche (1)
- Steels (1)
- Stress relaxation (1)
- Structure property correlations (1)
- Structure-property correlation (1)
- Superalloy (1)
- Superelasticity (1)
- Superlattice extrinsic stacking faults (1)
- Surface energy (1)
- Surface nucleation (1)
- Tb3+ (1)
- Tensile stress relaxation (1)
- Thermodynamic stability (1)
- Thermodynamische Stabilität (1)
- Thermomechanical fatigue (1)
- Time-offlight Diffraction (TOFD) (1)
- Ultrasonic Testing (1)
- Vickers Hardness (1)
- Viscose sintering (1)
- Water-based (1)
- Wissensrepräsentation (1)
- Women in science (1)
- X-ray diffraction (1)
- corrosion (1)
- high entropy alloys (1)
- oxidation (1)
- scanning electron microscopy (1)
- sulfidation (1)
Organisationseinheit der BAM
- 5 Werkstofftechnik (60) (entfernen)
This study aims to represent an approach for transferring the materials testing datasets to the digital schema that meets the prerequisites of the semantic web. As a use case, the tensile stress relaxation testing method was evaluated and the testing datasets for several copper alloys were prepared. The tensile stress relaxation testing ontology (TSRTO) was modeled following the test standard requirements and by utilizing the appropriate upper-level ontologies. Eventually, mapping the testing datasets into the knowledge graph and converting the data-mapped graphs to the machine-readable Resource Description Framework (RDF) schema led to the preparation of the digital version of testing data which can be efficiently queried on the web.
The heat-resistant cast iron EN-GJSA-XNiSiCr35-5-2 (Ni-Resist D-5S) was investigated for its fatigue crack growth behavior at room and high temperatures. Force-controlled tests were carried out at constant temperatures (20 °C, 500 °C, 700 °C) without and with hold time and different load ratios. The crack growth behavior was also characterized under TMF loading (Tmin = 400 °C, Tmax = 700 °C) by applying IP and OP conditions and different load ratios. Three different techniques were combined to monitor crack growth: potential drop, thermography, and compliance method. The effect of the different loading conditions on the fatigue crack growth behavior will be presented and discussed.
In this presentation, the results of the determination of the diffraction and single-crystal elastic constants of laser powder bed fused Inconel 718 are presented. The analysis is based on high-energy synchrotron diffraction experiments performed at the Deutsches Elektronen-Synchrotron. It is shown that the characteristic microstructure of laser powder bed fused Inconel 718 impacts the elastic anisotropy and therefore the diffraction and single-crystal elastic constants. Finally, the consequences on the diffraction-based residual stress determination of laser powder bed fused Inconel 718 are discussed.
Manipulating ceramic powder compacts and ceramic suspensions (slurries) within their volume with light requires a minimum transparency of the materials. Compared to polymers and metals, ceramic materials are unique as they offer a wide electronic band gap and thus a wide optical window of transparency. The optical window typically ranges from below 0.3 µm up to 5µm wavelength. Hence, to penetrate with light into the volume of a ceramic powder compound, its light scattering properties need to be investigated and tailored. In the present study we introduce the physical background and material development strategies to apply two-photon-polymerization (2PP), and other volumetric methods for the additive manufacture of filigree structures within the volume of ceramic slurries.
In order to be able to manipulate ceramic powder compacts and ceramic suspensions (slurries) within their volume with light, a minimum transparency of the materials is required. Compared to polymers and metals, ceramic materials are characterized by the fact that they have a wide electronic band gap and therefore a wide optical window of transparency. The optical window generally ranges from less than 0.3 µm to 5 µm wavelength. In order to focus light into the volume of a ceramic powder compact, its light scattering properties must therefore be tailored. In this study, we present the physical background and material development strategies for the application of two-photon polymerization (2PP) and selective volumetric sintering for the additive manufacturing of structures in the volume of ceramic slips and green compacts.
Gas turbine components, made of nickel-based alloys, undergo material damage due to high temperatures and mechanical stresses. These components need periodic replacement to avoid efficiency loss and failure. Repair of these parts is more cost-effective than replacement. State-of-the-art repair technologies, including different additive manufacturing (AM) and brazing processes, are considered for efficient restoration. Materials properties mismatches and/or internal defects in repaired parts may expedite crack initiation and propagation, reducing fatigue life. To understand the crack growth behavior in joining zones and predict the remaining life of repaired components, fatigue crack growth (FCG) tests were conducted on specimens of nickel-based alloys joined via brazing, pre-sintered preforms and AM. The FCG experimental technique was successfully adapted for joined specimens and results indicate that the investigated braze material provides a lower resistance to crack growth. In AM-sandwich specimens, the crack growth rates are significantly reduced at the interface of AM and cast material.
Unlike conventional alloys, which typically consist of one main element, high-entropy alloys (HEAs) contain five or more principal elements, which broaden chemical complexity and with it a realm of synergistic mechanisms. The AlMo0.5NbTa0.5TiZr HEA initiated a subclass of Al-containing refractory (r)HEAs that has recently drawn attention [2]. The alloy has a superalloy-resembling B2/bcc nanostructure, which inspired its name refractory high entropy superalloy (RSA). With high-temperature (HT) compressive strengths beyond conventional Ni-based superalloys, this nanostructure could be used for improved HT structural applications. However, in the application-relevant HT regime the Al-Zr-rich B2 phase decomposes to form a hexagonal Al-Zr-based intermetallic (Al4-xZr5; x: 0..1) [3,4]. This work explores the fascinating yet fatal micromechanisms associated to this phase transformation, in the context of creep, annealing and oxidation experiments performed between 800 and 1200 °C.
The material was produced by arc-melting and heat treatment in argon, which lead to grain boundaries decorated with up to 7%. Interrupted constant-load creep tests were performed under vacuum (at 10-4 Pa), at 900–1100 °C with external tensile stresses of 30–120 MPa. Oxidation experiments were separately conducted for 24 hours at 800 and 1000 °C in both dry (21% O2 + 79% N2) and humid (8% O2 + 74% N2 + 18% H2O) air. After the experiments, the samples were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy to reveal degradation mechanisms. Crystallographic texture, orientation relationships and stabilization of an oxygen-containing iso structure (Al4-xZr5(Ox-y); y: 0..x) of the Al-Zr-rich intermetallic are found and discussed.
This is the stable version of the full-notch creep test ontology (OntoFNCT) that ontologically represents the full-notch creep test. OntoFNCT has been developed in accordance with the corresponding test standard ISO 16770:2019-09 Plastics - Determination of environmental stress cracking (ESC) of polyethylene - Full-notch creep test (FNCT).
The OntoFNCT provides conceptualizations that are supposed to be valid for the description of full-notch creep tests and associated data in accordance with the corresponding test standard. By using OntoFNCT for storing full-notch creep test data, all data will be well structured and based on a common vocabulary agreed on by an expert group (generation of FAIR data) which is meant to lead to enhanced data interoperability. This comprises several data categories such as primary data, secondary data and metadata. Data will be human and machine readable. The usage of OntoFNCT facilitates data retrieval and downstream usage. Due to a close connection to the mid-level PMD core ontology (PMDco), the interoperability of full-notch creep test data is enhanced and querying in combination with other aspects and data within the broad field of materials science and engineering (MSE) is facilitated.
The class structure of OntoFNCT forms a comprehensible and semantic layer for unified storage of data generated in a full-notch creep test including the possibility to record data from analysis and re-evaluation. Furthermore, extensive metadata allows to assess data quality and reliability. Following the open world assumption, object properties are deliberately low restrictive and sparse.
This contribution presents the results of an experimental study on the LCF behavior of an austenitic 316L stainless steel produced by laser powder bed fusion featuring a low defect population, which allows for an improved understanding of the role of other typical aspects of a PBF‑LB microstructure. The LCF tests were performed between room temperature and 600 °C. A hot‑rolled 316L variant was tested as a reference. The mechanical response is characterized by strain-life curves, a Coffin‑Manson‑Basquin fitting, and cyclic deformation curves. The damage and deformation mechanisms are studied with X-ray computed tomography, optical and electron microscopy. The PBF‑LB/M/316L exhibits lower fatigue lives at lower strain amplitudes. The crack propagation is mainly transgranular. The solidification cellular structure seems to be the most relevant underlying microstructural feature determining the cyclic deformation behavior.
Several studies have been shown that the electron beam can be used to create nanomaterials from microparticle targets in situ in a transmission electron microscope (TEM). Here, we show how this method has to be modified in order to synthesize plasmonic gold nanoparticles (NPs) on insulating silicon oxide substrate by employing a scanning electron microscope with a comparatively low acceleration voltage of 30 kV. The synthesized NPs exhibit a random distribution around the initial microparticle target: Their average size reduces from 150 nm to 3 nm with growing distance to the initial Au microparticle target. Similarly, their average distance increases. The synthesized NP assemblies therefore show distinctly different plasmonic behaviour with growing distance to the target, which allows to study consequences of random hybridization of surface plasmon in disordered system, such as Anderson localization. To reveal the surface plasmons and their localization behaviour we apply electron energy loss spectroscopy in the TEM.