Abstract
Recrystallization is the process by which a strained microstructure is replaced by a strain-free set of grains through nucleation and growth. A constitutive model for recrystallization has been developed within the framework of an existing dislocation-based rate and temperature-dependent plasticity model. The theory includes an isotropic hardening variable to represent the statistically stored dislocation density, a scalar misorientation variable related to the spacing between geometrically necessary boundaries, and a variable that tracks the recrystallized volume fraction. The theory has been implemented and tested in a finite element code. Material parameters were fit to data from monotonic compression tests on 304L steel for a wide range of temperatures and strain rates. The model is then validated by using the same parameter set in predictive simulations of experiments in which wedge forgings were produced at elevated temperatures. From the forgings, tensile specimens were machined and tested. Model predictions of the final yield strengths compare well to the experimental results.
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Brown, A.A. et al. (2011). Predictive Simulation of a Validation Forging Using a Recrystallization Model. In: Proulx, T. (eds) Time Dependent Constitutive Behavior and Fracture/Failure Processes, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-9794-4_9
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DOI: https://doi.org/10.1007/978-1-4419-9794-4_9
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