In order to construct a well-characterized initial microstructure for Monte-Carlo simulation, computer-generated two dimensional modcl-microstructures were obtained by a mosaic method, and the characteristics of grains were analyzed. In this method, a microstructure is represented by a system consisting of 200• 200 lattice sites which are arranged periodically with a triangular shape. On this lattice, five microstructures, each consisting of 1000 grains with 100 randomly distributed orientations, were generated. The diameter and areal distribution of grains were in accordance with a gamma function, whereas the distribution of the number of sides shows a log-normal function, which was attributed to the behaviors of the grains of extreme shapes. Overall, the model-microstructure is suitable for the simulation of oriented grain growth since the topological characteristics, such as the relationships among the diameter, areal size and the number of sides of grains, are close to what are observed in real microstructures.
In order to investigate the effect of GBCD on microstructural evolution, a Monte-Carlo computer simulation method was developed in which the texture of real material was closely reconstructed in the simulated microstructure. This method consists of extracting a volume fraction and a Gaussian half-width from an experimental ODF of a Fe-3%Si alloy and planting them into the simulated microstructure. Using the reconstructed microstructure, the recrystallization texture formation characteristic of this alloy was studied with a particular focus on the anisotropic mobility of grain boundaries. By deliberately assigning a high anisotropic mobility (1000 times) to the grain boundaries with a misorientation angle in the range of 20 to 45 degrees, the abnormal grain growth phenomenon was analyzed. It was found that a selective growth of grains occurred when they were subjected to such pertinent conditions as their own high mobility accompanied by the presence of the neighboring low-mobility grains. Grains with a Goss orientation conformed to this general pattern of selective coarsening. Therefore, the present result strongly suggests that the theory of Hayakawa et al. -based on the selective growth of the Goss grains with particular boundary misorientation angles -needs to be modified so as to incorporate more general cases.
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