Novel hybrid laser forging and arc additive repairing process for improving component performances

•A new hybrid laser forging and arc additive repairing process was developed to significantly improve the performance of repaired components.•The laser shocking pressure is much higher than the Hugonoit elastic limit of the high-temperature solidified metal, causing laser forging.•The high strain and severe plastic deformation induced by laser forging cause the martensite formation and grain refinement.