Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-04-14
1994-09-06
Dean, Richard W.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
75626, 75628, 148426, 148427, 148428, 148429, C22F 110
Patent
active
053445104
ABSTRACT:
Superalloy articles are made more oxidation resistant by a process which includes heating the article in an environment having a reduced pressure of inert gas and a low partial pressure of oxygen to a temperature at which the sulfur in the article diffuses out. The heat treatment is best carried out at a temperature 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. Alternatively, the heat treatment may be carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. At such temperatures, sulfur readily diffuses out of the article, and a more oxidation resistant component is produced.
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Corrosion & Particle Erosion at High Temperatures, by V. Srinivasan and K. Vedula; "Effect of Sulfur Removal on Scale Adhesion to PWA 1480", by B. K. Tubbs and J. L. Smialek (p. 459); 1989.
Allen William P.
Parille Donald R.
Dean Richard W.
Koehler Robert R.
Sohl Charles E.
United Technologies Corporation
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