Simulation Analysis of Static Recrystallization by Molecular Automaton

Abstract

Abstract. In this paper, people mainly take three two-dimensional arrays State, Energy and Ori (Ori is the positive integer of max 1 Ori Ori ≤ ≤ ) to perform the molecular states and build models. According to the simulation results of molecular automaton, people have a research on the change and distribution of the grain diameter and the number of side during the process of static recrystallization, and conclude as follows, the relationship between the disappearing rate of individual deformation grain and the growth rate of individual recrystallization grain is characterized by randomness during the whole recrystallization process; the more the deformation, the smaller the mean diameter of grain is, at the finished moment of recrystallization; the grain diameters are not homogeneous during the static recrystallization process and at the finished moment of static recrystallization. ForewordIn recent years, it has been the hot spot of the research to simulate the microstructure evolution by molecular automaton. Since Hesselbarth [1] firstly simulated the recrystallization in two dimensional condition by molecular automaton in 1991, the molecular automaton model of recrystallization has been developed rapidly. However, the effect of the plastic deformation before the static recrystallization on grain forms has not been considered in the former models, and in fact, certain deformation is the essential requirement of the static recrystallization. Therefore, based on the parent phase structure of the equiaxed grains, the author can get the corresponding deformation structure through mesh mapping. On the basis of the above research, the author can build the static recrystallization model, lay emphasis on the analysis of the change rule of grain sizes, the distribution of grains diameter and the number of sides, and make a further understanding on the static recrystallization process. The building of molecular automaton modelIn this paper, people mainly take three two-dimensional arrays State, Energy and Ori (Ori is the positive integer of max 1 Ori Ori ≤ ≤ ) to illustrate the molecular states in the research models. State can record whether the molecule can be recrystallized, and the result "0" means the molecule has a deformed structure, "1" means the molecule forms the recrystallization core, and "2" means the molecule can form recrystallization through core growth. Energy records the storage energy of molecule, which can be taken as the driving force of molecular recrystallization. Ori illustrates the molecular motion orientation. The molecules with the same orientation can form a grain, while the grains with different orientation can form natural grain boundary. The initial grain orientation value Ori can be obtained after the different effects of the equiaxed grains deformation e. During the recrystallization process, with the extending of the time step, the deformed grains can be swallowed by the new-formed recrystallization core, and at the same time, three state variables of the molecule has the corresponding ...