5 Werkstofftechnik
Filtern
Erscheinungsjahr
- 2018 (64) (entfernen)
Dokumenttyp
- Zeitschriftenartikel (28)
- Vortrag (18)
- Beitrag zu einem Tagungsband (10)
- Posterpräsentation (8)
Schlagworte
- CCUS (6)
- Corrosion (6)
- High temperature corrosion (6)
- Carbon steels (5)
- Martensitic steel (5)
- Superaustenite steel (5)
- Supercritical/dense phase CO2 (5)
- CCS (4)
- Droplet corrosion (4)
- Hydrogen (4)
- Ferritic-martensitic steels (3)
- Inconel 686 (3)
- Laser ablation in liquid (3)
- Microstructure (3)
- Nanoparticles (3)
- Sulfidation (3)
- Titanium oxide (3)
- ToF-SIMS (3)
- AISI 304L (2)
- Additive manufacturing (2)
- Adiabatic calorimeter (2)
- Austenitic stainless steel (2)
- Carbon capture (2)
- Carbon dioxide (2)
- Deuterium (2)
- Diffraction contrast (2)
- Dislocation (2)
- EBSD (2)
- Electron microscopy (2)
- Fraktographie (2)
- High-temperature corrosion (2)
- Impurities (2)
- Injection (2)
- Oxidation (2)
- Particle morphology (2)
- Phase change material (2)
- Residual stress (2)
- Salt eutectics (2)
- Scanning transmission electron microscopy (STEM) (2)
- Selective laser melting (2)
- Steel (2)
- Superalloy single crystals (2)
- TEM (2)
- Thermal energy storage (2)
- XANES (2)
- 316L (1)
- Aggressive environement (1)
- Aggressive environment (1)
- Aggressive gases (1)
- Alloys (1)
- Alumina coatings (1)
- Amorphization (1)
- Amorphous silica (1)
- Annealing (1)
- Aquifer (1)
- Artefact (1)
- Austenitic steel (1)
- Bacteria (1)
- Bimodal distribution (1)
- Biogeochemistry (1)
- Bravais lattice (1)
- Brown-rot fungi (1)
- CCUS, supercritical/dense phase CO2, carbon steels, martensitic steel, superaustenite steel, droplet corrosion (1)
- CO2 corrosion (1)
- Carbon steels (1)
- Carbon storage (1)
- Ccs (1)
- Co2-Storage (1)
- Coating (1)
- Cobald based alloy (1)
- Complex loading (1)
- Coniophora puteana (1)
- Corrosion Fatigue (1)
- CrN/NbN (1)
- Creep (1)
- Creep mechanisms (1)
- Creep-fatigue (1)
- Crystal Orientation (1)
- Cupriavidus metallidurans (1)
- Cyclic loading (1)
- Cyclic oxidation (1)
- Diffraction (1)
- EDXRD (1)
- EFTEM (1)
- Early stages (1)
- FIB Tomography (1)
- Fatigue (1)
- Fatigue fracture (1)
- Femtosecond laser (1)
- Finland (1)
- Fluoride nanoparticles (1)
- Fluorolytic sol−gel (1)
- Friction (1)
- GMR sensors (1)
- Geothermal (1)
- Gold (1)
- Grain Boundary Corrosion (1)
- Graphite (1)
- Heat treatment (1)
- High - temperature corrosion (1)
- High Cycle Fatigue (1)
- High Temperature Corrosion (1)
- High interstitial austenitic steel (1)
- Hipims (1)
- Impact wear (1)
- Implant failures (1)
- In situ (1)
- In situ diffraction (1)
- In-situ (1)
- In-situ SEM micro shear deformation (1)
- Inconel 625 (1)
- Inconel 686 coating (1)
- Interdiffusion (1)
- Internal Sulfidation (1)
- Kikuchi pattern (1)
- Kunststoffe (1)
- Laser Cladding (1)
- Laser cladding (1)
- Lattice parameters (1)
- Log-normal distribution (1)
- Low carbon steel (1)
- Low cycle fatigue (1)
- Magnetic stray field (1)
- Martensite (1)
- Martensitic steel (1)
- Material characterization (1)
- Material defects (1)
- Material oxidation (1)
- Metallic components (1)
- Micro-shrinkages (1)
- Microsegregation (1)
- Microstructur (1)
- Microstructure and texture (1)
- Microstructure evolution (1)
- Misorientation (1)
- Mobility (1)
- Model alloy (1)
- Modeling (1)
- Molecular dynamics (1)
- Multiaxial stress state (1)
- NGS (1)
- Nano-scratch test (1)
- Nanoparticle structure (1)
- Nanoscale multilayers (1)
- Natural silver wires (1)
- Neutron diffraction (1)
- Nickel based coatings (1)
- Orientation refinement (1)
- Oxide coatings (1)
- Oxide scale (1)
- Oxyfuel (1)
- Pipeline (1)
- Polyaniline (1)
- Raman spectroscopy (1)
- Resistance stress (1)
- Rhodonia placenta (1)
- SEM (1)
- SEM wood characterization (1)
- SIMS (1)
- Scanning electron microscopy (1)
- Schwingbrüche (1)
- Segregation (1)
- Shear load (1)
- Shear testing (1)
- SiO2 (1)
- Sliding simulation (1)
- Steam oxidation resistance (1)
- Steel P92 (1)
- Stereoscopy (1)
- Sulphidation (1)
- Superaustenite steel (1)
- Supercritical/dense phase CO 2 (1)
- Support configurations (1)
- TIG-welding (1)
- Thermo-mechanical fatigue (1)
- Thermo-mechanical loading (1)
- Thin tribofilm (1)
- Titanium (1)
- Transmission electron microscopy (1)
- Visualization (1)
- Water droplet erosion resistance (1)
- Wood protection (1)
- XRD (1)
- laser cladding (1)
Organisationseinheit der BAM
- 5.1 Mikrostruktur Design und Degradation (64) (entfernen)
Eingeladener Vortrag
- nein (18)
Degradation of AISI 630 exposed to CO2-saturated saline aquifer at ambient pressure and 100 bar
(2018)
In general high alloyed steels are suitable as pipe steels for carbon capture and storage technology (CCS), because they provide sufficient resistance against the corrosive environment of CO2-saturated saline aquifer which serves as potential CCS-site in Germany. High alloyed martensitic steel AISI 630 has been proven to be sufficient resistant in corrosive environments, e.g. regarding heat, pressure, salinity of the aquifer, CO2-partial pressure), but reveals a distinct corrosion pattern in CCS environment. Therefore coupons of AISI 630 heat treated using usual protocols were kept at T=60 °C and ambient pressure as well as p=100 bar up to 8000 h in an a) water saturated supercritical CO2 and b) CO2-saturated synthetic aquifer environment similar to on-shore CCS-sites in the Northern German Basin. AISI 630 precipitates a discontinuous ellipsoidal corrosion layer after being exposed for more than 4000 hours. Best corrosion resistance in the CO2-saturated synthetic aquifer environment phase is achieved via normalizing prior to exposure. In water saturated supercritical CO2 tempering at medium temperatures after hardening gives lowest corrosion rates. Corrosion fatigue via push-pull tests with a series of 30 specimens was evaluated at stress amplitudes between 150 MPa and 500 MPa (sinusoidal dynamic test loads, R=-1; resonant frequency ~ 30 Hz). The endurance limit of AISI 630 is reduced by more than 50% when exposed to CCS environment (maximum number of cycles (10 x 106) at a stress amplitude of 150 MPa).
In CCS environment (carbon capture and storage) pipes are loaded statically and/or cyclically and at the same time exposed constantly to the highly corrosive hot thermal water. Experimental procedures such as ambient pressure immersions tests, in-situ corrosion fatigue experiments using a flexibly designed corrosion chamber at ambient pressure and a specially designed corrosion chamber at high pressure. Experimental set-ups for push/pull and rotation bending load are introduced. The corrosion behavior and lifetime reduction of high alloyed steels (X46Cr13, 1.4043), (X5CrNiCuNb16-4, 1.4542) and (X2CrNiMoN22-5-3, 1.4462) is demonstrated (T=60 °C, geothermal brine: Stuttgart Aquifer flow rate: 9 l/h, CO2 ).
The commercial usage of latent thermal energy storages primarily depends on the development of a suitable phase change material (PCM). For industrial high temperature applications above 400 °C multicomponent chloride eutectics are promising and therefore discussed seriously. The profound thermodynamic investigation of such eutectics requires a much greater amount of specimen material than conventional calorimeter can handle. Therefore, a special adiabatic calorimeter was developed and designed. With a specimen mass of > 100 g the typical thermodynamic measurements with a commercial calorimeter can be extended by cycle stability measurements, which are often decisive for practical application of PCM. Furthermore, by implementing corrosion specimens inside the calorimeter high temperature corrosion experiments according to ISO 21608 can be performed inside the calorimeter. Adiabatic measuring conditions can be provided by using two separate heating systems. Therefore, the outer “protective system” follows the temperature curve of the inner “measuring system” minimizing the temperature difference between the heating systems and simultaneously preventing heat losses from the measuring systems.
The application of implants e.g. for osteosynthesis or substitution of worn out joints is common practice since decades. Successes in surgery and orthopedics are highly dependent on the use of artificial parts for implanting into the human body. Over the years the number of surgical procedures and the number of different implants were growing rapidly. Implants, however, are exposed to complex mechanical, corrosive and tribological loads along with restriction in geometric dimension. While being essentially successful, the sheer number of cases leads to a rising number of implant failures. Such failures are painful for the affected patients and are very costly.
The failure cases presented in this paper occurred from 1981 to 2016. The predominant failure mechanism of all kinds of implants is fatigue fracture. Fatigue cracks are initiated due to a whole bunch of reasons: Material defects and fabrication defects are rare events. The main factors are cyclic overload due to improper fitting with delayed bone healing, corrosion and unauthorized modification of the implant during surgery
The work presents the microstructure, chemical composition and mechanical properties of Inconel 686 coatings after high - temperature corrosion in environment of aggressive gases and ashes. To produce the Ni - based coatings the QS Nd:YAG laser cladding process was carried out. As the substrate used 13CrMo4-5 boilers plate steel. Ni - base alloys characterize the excellent high-temperature corrosion resistance, good strength and ability to work in aggressive environments. Formed clad were characterized by high quality of metallurgical bonding with the substrate material and sufficiently low amount of the iron close to the clad layer surface. After corrosion experiment the oxide scale on the substrate and clad created. The scale on 13CrMo4-5 steel had 70 μm thickness while the scale of the clad had less than 10 μm. The microstructure, chemical composition of the obtained clad and scales were investigated by scanning electron microscope (SEM) and electron probe microanalyzer (EPMA) equipped with the EDS detectors.
Our research focused on Inconel 625 weld overlays on 16Mo3 steel boiler pipes. The Investigation focused on the characterization of changes in the microstructure and chemical composition after annealing. The annealing was performed for ten hours at temperatures from 600 to 1000°C. Changes in the microstructure were observed with a scanning and transmission electron microscope (SEM and TEM). The investigation was supplemented by hardness measurements.
Dislocations are the carriers of plastic deformation. As such, their characterization offers important information on the properties they affect. In this contribution, a new tool is presented, which is incorporated in Amira ZIB Edition and allows for three-dimensional (3D) imaging and quantification of dislocations substructures from thick regions an electron-transparent specimen. In the tool, the dislocation segments are traced on diffraction contrast images that are obtained in the transmission electron microscope (TEM). The uncertainties related to the experimental setup and to the proposed method are discussed on the base of a tilt series.
The Ni-Cr-Mo-W alloy is characterized by the excellent high-temperature corrosion resistance, good strength and ability to work in aggressive environments. To protect the surface of the substrate 13CrMo4-5 steel against aggressive environments the Inconel 686 as clad layer was used. The corrosion process was performed in oxidizing mixture of gases like O2, COx, SOx. The second part of corrosion Experiment concerned the corrosion test of the coating in reducing atmosphere of the specified gases with ashes, which contained e.g. Na, Cl, Ca, Si, C, Fe, Al.
Im Rahmen der Erstellung einer fraktographischen online-Datenbank an der BAM wurden systematisch Schwingversuche an einem Sinterstahl vorgenommen, dessen Sinterdichte variiert wurde. Die erzeugten Bruchflächen wurden analysiert, mit der Literatur verglichen und Datensätze in die Datenbank eingefügt.
Im Rahmen der DGM/DVM AG Fraktographie wird an der BAM eine fraktographische online-Datenbank aufgebaut. Während von metallischen Werkstoffen viele Beispiele vorliegen, die auch gut verstanden sind, sind die Brüche von Kunststoffen bislang weniger prominent vertreten. Eine teils ungeklärte Frage ist, in welcher Form sich an Kunststoffen klassische Schwingbrüche nachweisen lassen, wie sie von metallischen Werkstoffen bekannt sind. Der Vortrag zeigt einige Beispiele im Detail und stellt diese zur Diskussion.