PROCESS FOR ENHANCING THE OXIDATION AND CORROSION RESISTANCE OF A COMPONENT MADE FROM A DISPERSION-HARDENED SUPERALLOY BY MEANS OF A SURFACE TREATMENT

摘要

1. A process for increasing the oxidation resistance and corrosion resistance of a component made of a dispersion strengthened superalloy by a surface treatment, characterised in that, regardless of the structural state of the starting material, the component is subjected to a surface treatment by coldworking, the degree of cold deformation in the surface zone (3, 5) being chosen so that, in the subsequent heat treatment, the available motive force leads to a fine-grained structure while the core zone (4) is forced to form coarse grains, and in that the component is subjected to recrystallization annealing in a temperature range above the recrystallization and below the solidus temperature.