Process for increasing the oxidation resistance and corrosion re

Details Process for increasing the oxidation resistance and corrosion re Process for increasing the oxidation resistance and corrosion re

1986-02-26

1990-03-20

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 115Q, 148903, C21D 109

Patent

active

049098594

ABSTRACT:
A process for increasing the oxidation resistance and corrosion resistance of a component made of a dispersion strengthened superalloy by means of a surface treatment, the object of which in every case is to produce or retain a fine-grained surface zone (5) while the core zone (4) of the component in all circumstances is forced to form coarse grains during the final recrystallization annealing in the temperature range between the recrystallization temperature and the solidus temperature. A fine-grained surface zone (5) is produced by cold-working the surface zone (3, 5) by shot-peening, surface milling or pressing or by heating the surface zone (7) to a temperature about 100.degree. to 140.degree. C. below the recrystallization temperature by means of a laser (9) or an arc (10) while the core zone is kept at less than 900.degree. C., or by application of a 10 to 50 .mu.m thick nickel layer onto the surface followed by diffusion of the nickel into the surface zone (nickel-rich surface layer 14) of the component at a temperature below the recrystallization temperature. In each case, recrystallization annealing in order to establish coarse grains in the core zone (4) is finally carried out.

REFERENCES:
patent: 4015100 (1977-03-01), Gnanamuthu et al.
patent: 4531981 (1985-07-01), Singer

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