The effect of multiaxial stress state on microstructure degradation of nickel based single crystal superalloys during creep


Project start:01.01.2010
Project end:31.12.2012
Programme:VEGA
Project number:2/0157/10
Institute position in the project:The only one project investigator
Project leader:Juraj Lapin
The project is focused on fundamental research of the effect of multiaxial stress state on microstructure degradation of nickel based single crystal superalloys during creep. The aim of the project is to explain the effect of magnitude and orientation of local stresses on evolution of degraded microstructure in the regions affected by a notch effect in the creep specimens. Selection of loading parameters and multiaxial stress state conditions will simulate operating stresses and temperatures of gas turbine blades and notch effects of internal cooling channels. Principally new knowledge about the kinetics of development of degraded microstructure under multiaxial stress state conditions will be obtained and the effect of degraded microstructure on mechanical properties will be defined. The expected fundamental knowledge will contribute to the development of new life assessment models for high pressure gas turbine blades.
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