Metal treatment – Stock – Ferrous
Reexamination Certificate
2005-12-13
2005-12-13
Wyszomierski, George (Department: 1742)
Metal treatment
Stock
Ferrous
C148S333000, C148S334000, C420S034000, C420S067000
Reexamination Certificate
active
06974506
ABSTRACT:
This invention relates to a method of manufacturing an improved ferritic or martensitic alloy based on iron and chromium strengthened by a dispersion of oxides, commonly called an Oxide Dispersion Strengthened or ODS alloy, and, more particularly to a method of manufacturing a ferritic or martensitic ODS alloy with large grains based on iron and chromium which has a single phase ferritic or martensitic matrix having an isotropic microstructure and a grain size that is sufficient to guarantee mechanical strength compatible with a use of this alloy at high temperature and/or under neutron irradiation.According to the invention, the method comprises slow cooling of an austenite at a cooling rate less than or equal to the critical cooling rate for transformation of this austenite into ferrite.
REFERENCES:
patent: 5167728 (1992-12-01), Weber
“Dispersion-Strengthed Nickel-base and Iron-base Alloys”, ASM Handbooks Online, “Volume 2: properties and selection: NonferrousAlloys and Special Purpose Materials” p 1-9.
Alamo Ana
Lambard Véronique
Seran Jean-Louis
Anderson Kill & Olick P.C.
Commissariat a l''Energie Atomique
Lieberstein Eugene
Meller Michael N.
Morillo Janelle
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