Modeling of the Influence of Initial Grain Sizes on Dynamic Recrystallization Using a Cellular Automaton Model

Abstract

A two-dimensional modified cellular automaton (CA) model was developed to simulate the dynamic recrystallization (DRX) behaviour during thermo-mechanical processing. It provides a link for multiscale modeling to bridge the mesoscopic dislocation activities with the macroscopic mechanical properties. This model is applied to investigate the effect of initial grain sizes on DRX process in commercial pure copper. The simulated results indicate that the stable size of recrystallized grain is independent on initial grain sizes. However, the percentage of DRX is not only related to the thermo-mechanical parameters, but also influenced by the initial microstructure. It is concluded that larger initial grain sizes promote a delay in the DRX occur on commercial pure copper. The calculated results compare well with the limited number of experimental observations and theoretical conclusions.

Quantitative Analysis of Dynamic Softening Behaviors Induced by Dynamic Recrystallization for Ti-10V-2Fe-2Al Alloy

“…The reason is that most of the peak stresses were higher than 398 MPa and the initial grain size was large. Deng et al has demonstrated that larger initial grain size delays the occurrence of DRX, and such delay induces the increase of Q value [26]. The fact is that large size grains have a lower fraction of grain boundaries acting as nucleation sites, and then DRX onset is delayed by the lower density of nucleation sites [27].…”

Modeling and Simulation of Dynamic Recrystallization of GCr15 Steel Using Cellular Automaton Method

“…It is generally thought that DRX consists of two regimes, nucleation and grain growth, both of which are dependent on the size, distribution and volume fraction of dispersed particles in particlecontaining alloys. The detail of introducing for DRX-CA model of particle-free alloy is already presented in the previous articles [7,8]. Here, the modified equations for particle-containing alloy are summarized in the following.…”

“…Cellular automaton (CA) is a mathematical algorithm which describes the evolution law of the complex system in discrete space and time. It is one of universal meso-scale and micro-scale simulated methods [2], which has been employed to simulate DRX successfully [3][4][5][6][7][8]. Gotez and Seetharaman [3] developed the first DRX-CA model.…”