Microstructure prediction of laser surface remelting zone of single crystal alloy DD2

A growth velocity analysis was carried out during laser surface remelting processing based on a minimum undercooling criterion and the relationships among dendrite growth velocities in the three <100> direction, moving velocities of the solid/liquid interface and laser scanning velocities for the different crystallographic orientations were also set up. The analytic results show that the growth direction of dendrites in the melting pool is obviously affected by the orientation of the matrix grain. According to this analysis, the melting pool shapes were reconstructed and predicted, which is agreement with the experimental results.