Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-04-14
1994-09-13
Dean, Richard O.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
75 1017, 75 1018, 75 1045, 75 1047, 75 1054, 75628, 148708, 148710, 148712, 427405, C22F 110
Patent
active
053465636
ABSTRACT:
Superalloy articles are made more oxidation resistant by a process which includes heat treating the article in the presence of foreign chemical species, at a temperature at which the foreign chemical species reacts with and modifies any oxide film present on the article surface. The heat treatment is best carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. Alternatively, the heat treatment may be carried out within the range defined by the incipient melting temperature of the article and about 150.degree. C. below the incipient melting temperature of the article. At such temperatures the foreign chemical species reacts with and modifies the oxide film on the article surface. Sulfur is then able to diffuse through such modified film, and a more oxidation resistant component is produced.
REFERENCES:
patent: 1710846 (1929-04-01), Smith et al.
patent: 2823139 (1958-02-01), Schulze et al.
patent: 3403058 (1968-09-01), Pollock
patent: 3853540 (1974-12-01), Schlatter et al.
patent: 3891425 (1975-06-01), McCarty
patent: 4209348 (1980-06-01), Duhl et al.
patent: 4719080 (1988-01-01), Duhl et al.
patent: 4895201 (1990-01-01), DeCrescente et al.
Corrosion & Particle Erosion at High Temperatures, by V. Srinivasan and K. Vedula, editors; The Minerals, Metals & Materials Society (1989); "Effect of Sulfur Removal on Scale Adhesion to PWA 1480", by B. K. Tubbs and J. L. Smialek (p. 459).
Adherent Al.sub.2 O.sub.3 Scales Formed on Undoped NiCrAl Alloys by James L. Smialek, Metallurgical Transactions A, vol. 18A, Jan. 1987, pp. 164-167.
Allen William P.
Bornstein Norman S.
Chin Stephen
DeCrescente Michael
Duhl David N.
Dean Richard O.
Koehler Robert R.
Sohl Charles E.
United Technologies Corporation
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