Method for bonding and/or repairing component parts made of an oxide dispersion-hardened nickel-based superalloy in the zone-annealed state of coarse-grained, longitudinally oriented column crystals

摘要

Component parts made of an oxide dispersion-hardened nickel-based superalloy in the state of coarse-grained, longitudinally oriented column crystals are renovated by fusion welding according to the argonarc, electron-beam, laser-beam or plasma-burner method by build-up welding (deposition welding, overlay welding) and/or joined together by junction welding, by first being subjected to a heat treatment in order to increase their ductility. Said heat treatment comprises solutionisation in the temperature range between 1160@C and 1280@C, followed by slow cooling at a rate of from 0.1@C/min to 5@C/min, to a temperature in the range between 500@C and 700@C, followed by cooling in air down to room temperature. Particularly advantageous economical method for in situ repairs on guide vanes (diffuser blades) and rotor blades of gas turbines. IMAGE