Abstract
The weld metal of stainless steel SUS310S was investigated for the purpose of making clear the direction of grain boundary migration. Using a vertex dynamics model, we calculated the transient process of the grain growth in the base metal and grain boundary migration in the weld metal. The results was compared with the observation of the grain boundary migration in the weld metal. The results are obtained as follows.
(1) A frictional coefficient for grain boundary migration is assumed to be proportional to the third power of the grain boundary length. The grain growth rate calculated using this coefficient agrees with the quarter power of growth time shown in our experiment.
(2) The distribution of numbers of edges surrounding a grain is apt to be universal and independent of the initial conditions and the vertex dynamics model.
(3) The moving direction of the grain boundary triple junctions calculated in the weld metal has good agreement with the experiment results.
