Modeling cyclic plasticity of additively manufactured alloy Mar-M-509 using a high-performance spectral-based micromechanical model

A high-performance full-field spectral crystal plasticity model referred to as MPI-ACC-EVPCUFFT is adapted to study the deformation behavior of additively manufactured Mar-M-509 & REG; cobalt-based superalloy. The model features a dislocation density-based hardening law for the evolution of slip resistance, a barrier effect induced by grain morphology to influence the slip resistance, and a slip system-level back-stress law for adjusting the driving force to slip. The model is used to interpret and predict strength of the alloy in tension, compression, load reversal, and low-cycle fatigue as a function of initial microstructure. The initial microstructure varied from sample-to-sample to represent the effects of build orientation and heat treatment. Results show that the model successfully reproduces phenomena pertaining to monotonic and cyclic deformation including the non-linear unloading, Bauschinger effect, and cyclic hardening/softening using a single set of model parameters. More-over, the model offers insights into fluctuations of mechanical fields and strain partitioning.

Automated summary

The high-performance full-field spectral crystal plasticity model MPI-ACC-EVPCUFFT has been adapted to study the deformation behavior of additively manufactured Mar-M-509 cobalt-based superalloy. The model successfully reproduces phenomena related to monotonic and cyclic deformation, offering new insights into predicting alloy strength and mechanical field fluctuations.