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In the paper, the grains growth of TC4-DT alloy joint durng EBW (electron beam welding) process was simulated by using Cellular Automaton method. In order to consider the effects of the growth of neigborhood cellular on the centre cells in the model, the solid fraction and solute distribution algorithms of classical CA model was improved. The growth of equiaxed grains and columnar crystals under uniform and non-uniform temperature field were simulated successfully by applying the modified model respectively. The temperature distribution near the fusion line of TC4-DT EBW joint was also calculated by using double ellipsoid heat source model. Then coupling the CA model with the temperature field, the grains growth process of the cross section of the welded zone was simulated. The simulation result fits well with experimental ones on the morphology and the size of the columnar crystals.

simulation