Method for locating metallic nitride inclusions in metallic alloy ingots.
White JC; Traut DE; Oden LL; Schmitt RA
U.S. Pat 5,110,546, 1992 May; :1-5
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.
Metal alloys; Metallurgy; Metallurgical processes; Analytical processes
U.S. Patent 5,110,546