Modelling of the evolution of the microstructure of Ti-alloy Ti64 during thermo-mechanical exposure / correlation to mechanical properties / TAKE OFF

01.04.2008 - 31.12.2011
Forschungsförderungsprojekt
The goal of this project is to model the microstructural changes of two Ti-6AL-4V during pre- and reheating, forging and especially heat treatments in a way that it is possible to predict the microstructure in the final part. Coupling these models with special purpose finite element programs offers the possibility to directly draw conclusions on mechanical properties like ultimate tensile stress and to deliver important input parameters for further part life time simulations. Thermal processes like heating of the prematerial, reheating between two forging steps and particularly several different heat treatments as well as forging processes have to be physically simulated in small scale in the lab varying all influence parameters like temperature, time, effective strain and strainrate. Furthermore the change in microstructure will be analysed using light, scanning and transmission electron microscopy as well as special 3D-imaging methods along the thermomechanical process. The experimental results will be linked with the process parameters using adequate semi-empirical and physical models. These mathematical equations will be coupled with the finite element software in order to simulate the microstructure development in dependence of the whole thermomechanical process. In order to check the reliability of such models special forgings will be produced with a broad variation of the process parameters. Comparing the micrustructure of these forgings with the output of the appropriate simulations offers the possibility to directly verify the quality of mathematical models.

Personen

Projektleiter_in

Projektmitarbeiter_innen

Institut

Contract/collaboration

  • voestalpine BÖHLER Aerospace GmbH &

Grant funds

  • FFG - Österr. Forschungsförderungs- gesellschaft mbH (National) Austrian Research Promotion Agency (FFG)

Forschungsschwerpunkte

  • Metallic Materials: 20%
  • Structure-Property Relationsship: 5%
  • Modeling and Simulation: 25%
  • Materials Characterization: 50%

Schlagwörter

DeutschEnglisch
TitanlegierungTitanium alloy
Finite Elemente Modellefinite element models
GefügecharakterisierungMicrostructure characterisation
Warmumformunghot-forming
WärmebehandlungenHeat treatments

Externe Partner_innen

  • voestalpine BÖHLER Aerospace GmbH &
  • Montanuniversität Leoben - CDL for Materials Modelling and Simulation

Publikationen