Description: Proposed techniques for 'hot'' metallographic preparation are described. The following data from experiments on saw cutting, hand grinding, and electrolytic polishing have been obtained: radioactive contamination from saw cutting and grinding; depths of scratches and cold worked metal from saw cutting and grinding; metal removal rates for various grades of emery grinding papers; metal removal rates for electropolishing; optimum sequence for specimen grinding on emery papers; and time requirements for satisfactory electrolytic polishing of saw cut, rough ground, and fine ground uranium specimens. It has been shown that an efficient and effective procedure for preparation of saw cut uranium is the removal of about three-fourths of the cold worked layer with grade number 2 paper, followed by grades 3/0 and 4/0. The remaining fine scratches and thin layer of cold worked metal were removed by prolonged electropolishing in phosphoric acidethylene glycol-ethyl alcohol solution. (auth)
Date: January 1, 1957
Creator: Brown, F.L.
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