Abstract: In order to realize the full laser repair of Inconel718 superalloy cracks, the short pulse laser was used to clean and etch the cracks, and the high-power continuous laser was used to repair the cracks. The influence of parameters such as laser power, scanning speed, and defocus amount on repair morphology, microstructure, phase composition and mechanical property was studied. The results show that a defect-free repair specimen can be obtained by controlling the process parameters (laser power, scanning speed, defocusing amount), and the Inconel718 Ni-based superalloy powder and Inconel718 matrix can be bonded metallurgically without new phase formation, the microhardness of the repair zone is 87%—88% of the matrix, and the tensile strength is 89% of the matrix.
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2019, Vol. 33 
