Linking phase-field and finite-element modeling for process-structure- property relations of a Ni-base superalloy

Establishing process-structure-property relationships is an important objective in the paradigm of materials design in order to reduce the time and cost needed to develop new materials. A method to link phase-field (process-structure relations) and microstructure-sensitive finite-element (structure-property relations) modeling is demonstrated for subsolvus polycrystalline IN100. A three-dimensional experimental dataset obtained by orientation imaging microscopy performed on serial sections is utilized to calibrate a phase-field model and to calculate inputs for a finite-element analysis. Simulated annealing of the dataset realized through phase-field modeling results in a range of coarsened microstructures with varying grain size distributions that are each input into the finite-element model. A rate-dependent crystal plasticity constitutive model that captures the first-order effects of grain size, precipitate size and precipitate volume fraction on the mechanical response of IN100 at 650 °C is used to simulate stress-strain behavior of the coarsened polycrystals. Model limitations and ideas for future work are discussed.