2003 年 21 巻 2 号 p. 256-266
Monte Carlo simulation of grain growth and recrystallization behaviors in HAZ was carried out for GTA and LB weldments of carbon steel and nickel on the basis of the Potts model. The temperature distribution in HAZ was analytically computed by quasi-stationary heat conduction equations. The coarsening of grain in HAZ increased markedly in the vicinity of fusion boundary in the GTA weldments compared with LB weldments of carbon steel. The recrystallized zone spread over the HAZ along the fusion boundary in GTA and LB weldments of nickel. The recrystallized grains near the fusion boundary were also coarsened with increasing the heat input while the grains around the interface between recrystallized and un-recrystallized zones were refined. It was elucidated that the grain growth and recrystallization behaviors in HAZ could be well visualized by the Monte Carlo simulation.