TY - CONF A1 - Kindrachuk, Vitaliy A1 - Fedelich, Bernard A1 - Becker, M. A2 - Beck, T. A2 - Charkaluk, E. T1 - Constitutive modelling of viscoplastic deformation in single crystal nickel-basis superalloys subjected to cyclic and creep loadings at high-temperatures T2 - Eighth International Conference on Low Cycle Fatigue N2 - 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 a nickel-basis superalloy. The predicted creep, short- and long-term relaxation and cyclic tests are in reasonable agreement with the experimental observations. PB - DVM e.V. CY - Berlin T2 - Eighth International Conference on Low Cycle Fatigue (LCF8) CY - Dresden, Germany DA - 27.06.2017 KW - Constitutive law KW - Single crystal KW - Superalloy KW - Creep KW - Low cycle fatigue PY - 2017 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/40928 AN - OPUS4-40928 SP - 371 EP - 376 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany