Cellular automaton calculation for dynamic recrystallization

Abstract

Since the mechanical behavior of superalloys can be optimized by tailoring the microstructure, the evolution of microstructure should be carefully controlled by thermo-mechanical treatments. To study the microstructure evolution of Ni-Cr-Fe based 718 alloy during hot forging, computational simulation and microstructure prediction model can be combined with experimental observation. It is necessary to establish a microstructure prediction model considering the recrystallization during the hot working process. In this work, cellular automaton (CA) method was used to simulate the dynamic recrystallization phenomena of 718 alloy during hot compression. The strain rate and temperature were considered as the processing variables. CA stress strain curves were compared with the experimental results and the prediction for the grain nucleation and growth were presented.