Filtern
Erscheinungsjahr
Dokumenttyp
- Vortrag (24)
- Zeitschriftenartikel (16)
- Beitrag zu einem Sammelband (16)
- Beitrag zu einem Tagungsband (12)
- Forschungsbericht (4)
- Sonstiges (2)
- Posterpräsentation (2)
Schlagworte
- Superalloys (6)
- Creep (5)
- Rafting (5)
- Extensometer (4)
- Nickel-base superalloys (4)
- Single crystal (4)
- TMF (4)
- CMSX-4 (3)
- Creep-deformation (3)
- Lattice distortion (3)
- SC16 (3)
- Thermo-mechanical fatigue (3)
- Axial-torsional Loading (2)
- Creep damage (2)
- Creep deformation (2)
- Dehnungsfehler (2)
- Einkristall (2)
- Fatigue (2)
- Gamma titanium aluminide (2)
- ISO 6892-1 (2)
- LCF (2)
- Measurement uncertainty (2)
- Microstructural degradation (2)
- Microstructure (2)
- Ni-base superalloy (2)
- Normung (2)
- Single-crystal nickel-base superalloys (2)
- Superlegierung (2)
- Temperaturschwankungen (2)
- Test methods (2)
- Thermo-mechanical Fatigue (2)
- Thermo-mechanische Ermüdung (2)
- X-ray diffraction (2)
- Accuracy (1)
- Analysis (1)
- Anisotropy of mechanical properties (1)
- Axial-torsional Belastung (1)
- Axial-torsional loading (1)
- Axial-torsional loadings (1)
- Carbon capture and storage (CCS) (1)
- Carburisation (1)
- Chaboche (1)
- Computersimulation (1)
- Constitutive law (1)
- Corrosion behaviour (1)
- Creep deformed (1)
- Damage (1)
- Dehngeschwindigkeit (1)
- Dehnungsgeregelt (1)
- Ductile grey cast iron (1)
- Dynamische Temperaturmessung (1)
- EN 10002-1 (1)
- EN 10275 (1)
- EN GJS X SiMo 4.05 (1)
- EN GJS X SiMo 5.1 (1)
- Effect of creep damage on LCF (1)
- Ermüdungsprüfung (1)
- European TENSTAND project (1)
- Fatigue testing standards (1)
- Force controlled TMF testing (1)
- Fractography (1)
- Gamma-Titanium Aluminide (1)
- Geschwindigkeitseinfluß (1)
- Grauguss mit globularem Graphit (1)
- Harmonisation (1)
- Heat resistant steels (1)
- High efficiency power plants (1)
- High temperature (1)
- High temperature LCF (1)
- Hocheffiziente Kraftwerke (1)
- Hochtemperatur (1)
- Hochtemperatur-LCF (1)
- Hochtemperaturverhalten (1)
- Hot corrosion (1)
- ISO 12111 (1)
- ISO 15363 (1)
- ISO materials testing standards (1)
- ISO mechanical testing standard (1)
- Kohlendioxidabscheidung und -speicherung (CCS) (1)
- Korrosionsverhalten (1)
- Lattice mismatch (1)
- Lebensdauer-Regeln (1)
- Lebensdauerabschätzung (1)
- Low Cycle Fatigue (1)
- Low cycle fatigue (1)
- Low-cycle fatigue (1)
- Low-cycle-fatigue (1)
- Materialidentifikation (1)
- Materialmodell (1)
- Mechanical properties (1)
- Mechanische Eigenschaften (1)
- Mehrachsige Belastung (1)
- Modeling (1)
- Modelling (1)
- Multiaxial fatigue (1)
- Nickel base superalloy (1)
- Nimonic 90 (1)
- Normative annex (1)
- Porosity (1)
- Power generation (1)
- Precipitates (1)
- Prior exposure (1)
- Product standard (1)
- Relative error (1)
- Relaxation (1)
- Schädigung (1)
- Secondary direction (1)
- Single crystal nickel-base superalloys (1)
- Spannungsgeregelt (1)
- Spröd-Duktil-Übergangstemperatur (1)
- Standardisation (1)
- Strain controlled tensile testing (1)
- Strain error (1)
- Stress rate (1)
- Superalloy (1)
- Superheater materials (1)
- Synchrotron x-ray radiation (1)
- TENSTAND (1)
- TENSTAND WP4 Report (1)
- TMF-Versuch (1)
- TNB-V5 (1)
- Temperature fluctuation (1)
- Thermal drift (1)
- Thermal expansion (1)
- Thermische Drift von Extensometern (1)
- Thermo-Mechanical strain-controlled fatigue testing (1)
- Thermomechanical (1)
- Thermomechanical fatigue (TMF) (1)
- Thermomechanische Ermüdung (1)
- Thermomechanische Ermüdung (TMF) (1)
- Titanaluminide (1)
- Titanium Aluminide (1)
- Titanium aluminides (1)
- Tnsile testing (1)
- Tube ring hydraulic pressure test (1)
- Turbine (1)
- Uncertainty annex (1)
- Uncertainty calculation (1)
- Vienna agreement (1)
- Viscoplasticity (1)
- Viskoplastische Materialmodelle (1)
- Warmfeste Stähle (1)
- X-ray-diffraction (1)
- Zugversuch (1)
- fatigue standard committee (1)
- temperature fluctuation of extensometers (1)
- von Mises Vergleichsspannung (1)
Organisationseinheit der BAM
Eingeladener Vortrag
- nein (24)
Tensile testing according to EN 10002-1 is one of the basic mechanical tests to characterise the mechanical properties of metallic materials. This testing procedure has been regularly under development for many decades in order to modify and amend it and to bring it up to an up to date standard. Today tensile testing for quality control in metals manufacturing industry is routinely performed automatically with computer controlled testing machines. Due to economical needs of industry proposals were made by a European Standard Committee to amend the standard EN 10002-1. A European research project with the acronym TENSTAND was started to validate the proposed modifications of the tensile testing standard. The work package 4 of the project was to validate the machine control characteristics. A comparison test program was started with ten partners, 4 test piece geometries and 3 test parameters for 6 materials, partly with upper and lower yield strength and partly with 0.2 % proof strength to compare experimental results according to the proposal to modify the standard EN 10002-1. Initially testing in the strain control mode was introduced as well as switching of the control mode to crosshead control 1 and switching of the testing speed at appropriate points during the test. The comparison test was evaluated statistically and scientifically. The following conclusions were derived from the comparison test and summarised as recommendations to the standard committees. The scatter of the material properties were not significantly reduced by introducing the amended testing procedure. Few of the reasons for the continuously observed scattercan be identified as follows: The material properties are observed to be widely dependent on the testing speed. As a consequence the range for the allowed testing speed must be reduced. The closed loop control was not optimised sufficiently in some tests, the use of complicated testing machine software led to misinterpretation of software commands, individual testing equipment and implementation of the tensile testing procedure led also to scatter of the material properties which lay in a range of few percent. This is blurred by the inhomogeneity of the material.
High-resolution diffraction using synchrotron x-ray radiation was applied to study γ´ precipitates with an L12 superlattice crystal structure in the single crystal superalloy SC16 after creep deformation at 1223 K with a creep strain of ±0.5% for tensile and compressive loads, respectively. The measurements of full width at half maximum (FWHM) of 001 and 100 γ´ superlattice reflections were performed at various temperatures from ambient temperature to 1173 K in vacuum. The experimental results revealed that the FWHM of both reflections decrease with increasing temperature. It is well-known that changes in particle size and lattice distortion in materials could lead to a variation of FWHM. The observed behaviour is discussed in the light of both the above-mentioned aspects. The decrease in the peak width is mainly attributed to the temperature dependence of the internal strain state.
A material family to replace the current superalloys in aeronautical gas turbine engines is
considered to be that of gamma Titanium Aluminide (γ-TiAl) alloys. Structural components in
aeronautical gas turbine engines typically experience large variations in temperatures and multiaxial
states of stress under non-isothermal conditions. The uniaxial, torsional and bi-axial thermomechanical
fatigue (TMF) behaviour of this γ-TiAl alloy have been examined at 400 800°C with
strain amplitudes from 0.15% to 0.7%. The tests were conducted at both in-phase (IP) and out-ofphase
(OP). The effects of TMF on the microstructure were also investigated. For the same
equivalent mechanical strain amplitude uniaxial IP tests showed significantly longer lifetimes than
pure torsional TMF tests. The non-proportional multiaxial OP test showed the lowest lifetimes at
the same equivalent mechanical strain amplitude compared to the other types of tests.
Microstructural and Mechanical Performance Assessment of Diffusion Bonded Bimetallic Model Discs
(2003)
The stability of microstructure and the microhardness of a NiCoCrAlY alloy was studied after thermal treatment at high temperatures and subsequent quenching into ice water. The alloy revealed mainly two ordered phases, a gamma' phase with L12 lattice structure and a beta phase with B2 structure. The gamma' phase is shown to become unstable in the temperature range between 1073 K and 1373 K where it undergoes an order-disorder phase transformation. The low transformation temperature compared to pure Ni3Al is ascribed to deviations from the Ni3Al stoichiometry and to the additional alloying elements Co and Cr. The gamma'-gamma order-disorder transformation is shown to be attended by a decrease in microhardness of about 30 %.