Constitutive modelling of viscoplastic deformation in single crystal nickel-basis superalloys subjected to cyclic and creep loadings at high-temperatures
- Gas turbines are widely used for a variety of purposes including power generation, compression or as jet engines in aircrafts. The critical components of a gas turbine are the high-pressure turbine blades which operate under severe conditions. These include thermo-mechanical loadings over temperatures ranging from room temperature up to 1100°C. While a large number of constitutive models for single crystals have been proposed, most applications are restricted to special loading scenarios, temperature range and deformation mechanisms. In particular, a number of models are focused on pure creep. Only a few papers consider application of both creep and fatigue. Applications of the constitutive models to long-term stress relaxation are even scarcer. The new model assumes deformation-induced softening and can properly reproduce the viscous behavior at different time scales. The model has been calibrated with the uniaxial tests at 800°C and 950°C in [001], [011] and [111] specimens of aGas turbines are widely used for a variety of purposes including power generation, compression or as jet engines in aircrafts. The critical components of a gas turbine are the high-pressure turbine blades which operate under severe conditions. These include thermo-mechanical loadings over temperatures ranging from room temperature up to 1100°C. While a large number of constitutive models for single crystals have been proposed, most applications are restricted to special loading scenarios, temperature range and deformation mechanisms. In particular, a number of models are focused on pure creep. Only a few papers consider application of both creep and fatigue. Applications of the constitutive models to long-term stress relaxation are even scarcer. The new model assumes deformation-induced softening and can properly reproduce the viscous behavior at different time scales. The model has been calibrated with the uniaxial tests at 800°C and 950°C in [001], [011] and [111] specimens of a nickel-basis superalloy. The predicted creep, short- and long-term relaxation and cyclic tests are in reasonable agreement with the experimental observations.…
Autor*innen: | Vitaliy Kindrachuk, Bernard FedelichORCiD, M. Becker |
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Persönliche Herausgeber*innen: | T. Beck, E. Charkaluk |
Dokumenttyp: | Beitrag zu einem Tagungsband |
Veröffentlichungsform: | Verlagsliteratur |
Sprache: | Englisch |
Titel des übergeordneten Werkes (Englisch): | Eighth International Conference on Low Cycle Fatigue |
Jahr der Erstveröffentlichung: | 2017 |
Verlag: | DVM e.V. |
Verlagsort: | Berlin |
Erste Seite: | 371 |
Letzte Seite: | 376 |
DDC-Klassifikation: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten |
Freie Schlagwörter: | Constitutive law; Creep; Low cycle fatigue; Single crystal; Superalloy |
Veranstaltung: | Eighth International Conference on Low Cycle Fatigue (LCF8) |
Veranstaltungsort: | Dresden, Germany |
Beginndatum der Veranstaltung: | 27.06.2017 |
Enddatum der Veranstaltung: | 29.06.2017 |
Verfügbarkeit des Dokuments: | Datei im Netzwerk der BAM verfügbar ("Closed Access") |
Datum der Freischaltung: | 07.07.2017 |
Referierte Publikation: | Nein |