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; :
A method is described for quantitatively determining the dissolution history of metallic nitride inclusions in metallic melts by (a) mixing together a halide of a metal and hafnium halide, (b) coreducing the mixture to form a metal-hafnium alloy sponge, (c) nitriding or reacting in air the sponge to form hafnium-labeled nitride or oxynitride inclusions, (d) seeding the metallic sponge to be melted with the hafnium-labeled nitride pieces to form ingots, (e) neutron activating the ingots, and (f) locating the hafnium locations in the ingot by radiometric means.
U S Pat 5 110 546 May 5, 1992