Method for locating metallic nitride inclusions in metallic alloy ingots

Patent · Tue Dec 31 23:00:00 EST 1991

OSTI ID:868274

White, Jack C ^[1]; Traut, Davis E ^[2]; Oden, Laurance L ^[1]; Schmitt, Roman A ^[2]

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1. Albany, OR
2. Corvallis, OR

A method of determining the location and history of metallic nitride and/or oxynitride inclusions in metallic melts. The method includes the steps of labeling metallic nitride and/or oxynitride inclusions by making a coreduced metallic-hafnium sponge from a mixture of hafnium chloride and the chloride of a metal, reducing the mixed chlorides with magnesium, nitriding the hafnium-labeled metallic-hafnium sponge, and seeding the sponge to be melted with hafnium-labeled nitride inclusions. The ingots are neutron activated and the hafnium is located by radiometric means. Hafnium possesses exactly the proper metallurgical and radiochemical properties for this use.

• Research Organization: National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV
• Assignee: United States of America as represented by Secretary of (Washington, DC)
• Patent Number(s): US 5110546
• OSTI ID: 868274
• Country of Publication: United States
• Language: English

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