Metal treatment – Compositions – Heat treating
Patent
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
Nazmy Mohamed
Rydstad Hans
BBC Brown Boveri & Company Limited
Rutledge L. Dewayne
Wyszomierski George
LandOfFree
Process for increasing the oxidation resistance and corrosion re does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for increasing the oxidation resistance and corrosion re, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for increasing the oxidation resistance and corrosion re will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-790668