Mikrostrukturbasierte Simulation der Eigenspannungsverteilung in wärmebehandelten Turbinenscheiben aus INCONEL718

Translated title of the contribution: Microstructural based simulation of the residual stress field in heat treated turbine discs from INCONEL718

Andreas Karl Drexler

Research output: ThesisDoctoral Thesis

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Abstract

Improving turbine disk geometries from INCONEL718 leads to emission reductions of future engines. To that purpose, the residual stress fields from the manufacturing process must be taken into account in the design. The manufacturing process consists of forging, heat treatment and machining to the final contour. The entire process comprises a temperature range of about 1000 °C, in which precipitates nucleate and growth. A thermo-kinetic model was parameterized and validated on the basis of extensive experimental investigations. A semi-empirical creep law was derived which considers the influence of precipitation strengthening on secondary creep rates. Using the microstructural based constitutive model and an accurate temperature field simulation, the residual stresses could be simulated with an accuracy of ± 50 MPa. Validation was carried out using the hole drilling technique and neutron diffraction. The integration of the improved model into the design process of turbine disks enables consideration of the manufacturing process and thus of the residual stresses.
Translated title of the contributionMicrostructural based simulation of the residual stress field in heat treated turbine discs from INCONEL718
Original languageGerman
QualificationDr.mont.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • Ecker, Werner, Co-Supervisor (internal)
  • Gänser, Hans-Peter, Supervisor (internal)
  • Keckes, Jozef, Assessor A (internal)
Publication statusPublished - 2018

Bibliographical note

embargoed until 03-05-2023

Keywords

  • residual stresses
  • turbine discs
  • Inconel 718
  • thermo-kinetic modelling
  • multiphysics simulations
  • constitutive modelling

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