Abstract: In order to improve the microstructure of laser directional solidification cladding for DZ22, realize large area repairing for directional solidification base materials, fixed variable method was adopted in this work, with which the influence of laser process parameters on the microstructure of directionally solidification alloy DZ22 was studied by changing the laser process parameters. The results showed that the primary dendrites spa-cing and the height of the steering dendrites zone became larger, the number of the secondary dendrites and the volume was bigger, and the zone of isoaxial crystal was increased with the increase of current and pulse width; The zone of isoaxial crystal in the laser cladding upper layer was enlarged first and then reduced, and the primary dendrites were tapering with the increase of frequency; Scanning velocity was negatively correlated with the primary dendrites scale, and the primary dendrites spacing and the height of the steering dendrites zone became smaller with the increase of scanning velocity, besides, high scanning speed was not conducive to the formation of columnar structure.
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