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Method for locating metallic nitride inclusions in metallic alloy ingots.

Authors
White-JC; Traut-DE; Oden-LL; Schmitt-RA
Source
U.S. Pat. 5,110,546, 1992 May; :1-6
NIOSHTIC No.
10002236
Abstract
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.
Keywords
Metal alloys; Metals; Metallurgical processes; Metallurgy
Publication Date
19920505
Document Type
Patent
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
P 2-92
NIOSH Division
ALRC
Source Name
U.S. Pat. 5,110,546
State
OR
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