Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1997-04-22
1999-05-04
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C22F 118
Patent
active
059000830
ABSTRACT:
A cast article is heat treated by vacuum annealing at an annealing temperature above the alpha/beta transition temperature of the cast article. Further, the cast article is subjected to a hot isostatic pressing step and a post-weld stress relief processing step. The vacuum annealing step is executed prior to the hot isostatic pressing step and the hot isostatic pressing step is executed prior to the post-weld stress relief processing step. The resulting impact resistance of the heat treated cast article, as measured by the Charpy test, represents an increase of approximately 50-200%, as compared to the untreated cast article. Further, even where the article is subjected to a post-HIP anneal the impact resistance increases by approximately 10-50%.
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C.M. Schwartz and M.W. Mallett, "Observations On The Behavior Of Hydrogen In Zirconium" Mar. 23, 1953 pp. 1-13.
Felzien Floyd Grant
Reed Dale Scott
Sheehan John
The Duriron Company, Inc.
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