Co-Cr-Mo powder metallurgy articles and process for their manufacture
AssigneeCRS Holding, Inc.
InventorGregory J. Del Corso
Life of this patent
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Abstract
A powder metallurgy article formed from a Co--Cr--Mo alloy powder and a method for making the article are disclosed. The Co--Cr--Mo alloy powder contains, in weight percent, about 0.35% max. C, about 1.00% max. Mn, about 1.00% max. Si, about 26.0-30.0% Cr, about 5.0-7.0% Mo, about 3% max. Ni, about 0.25% max. N, about 1.00% max. Fe, about 0.01% max. of oxide forming metals, and the balance is essentially Co. Within their respective weight percent limits C and N are controlled such that they satisfy the relationship: 62.866+360.93.times.(%C)+286.633.times.(%N)-682.165.times.(%C).sup.2 -641.702.times.(%N).sup.2 .gtoreq.120.
Claims18
A method for producing a Co--Cr--Mo alloy article having a unique combination of strength, hardness, ductility, and corrosion resistance comprising the steps of:
- preparing a powdered alloy charge consisting essentially of, in weight percent, about:
- ______________________________________ % ______________________________________ Carbon 0.35 max. Manganese 1.00 max. Silicon 1.00 max. Chromium 26.0-30.0 Molybdenum 5.0-7.0 Nickel 3.00 max. Nitrogen 0.25 max. Iron 1.00 max. Cobalt Balance ______________________________________
- wherein the amounts of carbon and nitrogen in said alloy satisfy the relationship:
- 62.866+360.93.times.(%C)+286.633.times.(%N)-682.165.times.(%C).sup.2 -641.702.times.(%N).sup.2 .gtoreq.120;
- and
- consolidating said powdered alloy charge at a temperature and pressure selected to produce a substantially fully dense compact.
A substantially fully dense, powder metallurgy article, formed from a Co--Cr--Mo alloy powder having a composition in weight percent of about:
- ______________________________________ % ______________________________________ Carbon 0.35 max. Manganese 1.00 max. Silicon 1.00 max. Chromium 26.0-30.0 Molybdenum 5.0-7.0 Nickel 3.00 max. Nitrogen 0.25 max. Iron 1.00 max. Oxide Forming Metals 0.01 max. Cobalt Balance ______________________________________
- wherein the amounts of carbon and nitrogen in said alloy satisfy the relationship:
- 62.866+360.93.times.(%C)+286.633.times.(%N)-682.165.times.(%C).sup.2 -641.702.times.(%N).sup.2 .gtoreq.120.
Dependencies are inferred from the claim text.