Abstract
Abstract A material model is presented for the prediction of the initiation of dynamic recrystallization in two-phase materials in which the second phase does not deform. Initiation is based on the criterion of Poliak and Jonas in which both energy and kinetic conditions are considered. The criterion is generalized for multiaxial stress states, and coupled with elastic-viscoplastic constitutive equations for high-temperature rate-sensitive materials undergoing strain hardening, dynamic recovery and strain softening due to dynamic recrystallization. The model is embodied within a finite-deformation finiteelement code. Micromechanical finite-element cells are then developed to model two-phase materials, and the dependence of the initiation of dynamic recrystallization on the second-phase volume fraction, shape and distribution is investigated. Stress-state dependence is also examined. Increasing volume fraction of the second phase is found to lead to considerably enhanced hardening at low strains but. at hi...
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