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US 10,094,007 B2Granted
Method of manufacturing a ferrous alloy article using powder metallurgy processing
AssigneeCRS Holdings, Inc.
InventorsDavid E. Wert, Timothy R. Armstrong, David A. Helmick, Michael L. Schmidt
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Abstract
A method of manufacturing a ferrous alloy article is disclosed and includes the steps of melting a ferrous alloy composition into a liquid, atomizing and solidifying of the liquid into powder particles, outgassing to remove oxygen from the surface of the powder particles, and consolidating the powder particles into a monolithic article.
Claims27
A method of manufacturing a ferrous alloy article, comprising the steps of:
- melting a ferrous alloy composition into a liquid, the ferrous alloy composition including, in wt. % of about C 0.2-0.45;
- and of Co at least about 1 up to 6;
- atomizing and solidifying the liquid into powder particles;
- removing oxygen from surfaces of the powder particles through vacuum hot outgassing to remove oxides and reducing a bulk oxygen content to approximately ≤20 ppm;
- and
- consolidating the powder particles into a monolithic article.
3 more elements
A method of manufacturing a ferrous alloy article, comprising the steps of:
- melting a ferrous alloy composition into a liquid, the ferrous alloy composition including, in wt. % of about C 0.2-0.45;
- and of Co at least about 1 up to 6;
- atomizing and solidifying the liquid into powder particles;
- separating the powder particles by size;
- mixing the powder particles into a homogenized blend;
- removing oxygen from surfaces of the powder particles through vacuum hot outgassing to remove oxides and reducing a bulk oxygen content to approximately ≤20 ppm;
- and
- consolidating the powder particles into a monolithic article.
5 more elements
A method of manufacturing a ferrous alloy article, comprising the steps of:
- melting a ferrous alloy composition into a liquid, the ferrous alloy composition including, in wt. % of about C 0.2-0.45;
- and of Co at least about 1 up to 6;
- atomizing and solidifying the liquid into powder particles using a high pressure inert gas selected from the group consisting of nitrogen and argon;
- separating the powder particles by size;
- mixing the separated powder particles into a homogenized blend;
- vacuum hot outgassing to remove oxides from surfaces of the powder particles positioned in a container to reduce a bulk oxygen content to approximately ≤20 ppm;
- and
- consolidating the powder particles into a monolithic article using hot isostatic pressing (HIP).
5 more elements
Dependencies are inferred from the claim text.