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A polishing procedure incorporating the use of diamond abrasives was developed for assignments representing the three major problem areas in metallographic preparation of ferrous and non-ferrous alloys, namely, loss of non-metallic inclusions, surface distortion, and insufficient flatness of field. Efforts were made to keep the metallographic technique simple and suitable for use even by relatively inexperienced personnel.
Results of the study indicated that the utilization of diamond abrasives minimized, to a large degree, polishing difficulties ordinarily experienced in the above mentioned problem areas. In addition, it was found that by using this polishing medium, one basic procedure could be used, thus avoiding the need of specialized techniques and experience often required when only conventional abrasives were employed.
Use of diamond abrasives was recommended in metallographic work wherein retention of nonmetallic inclusions, surface distortion, or flatness of field constitute a problem.
Olden, E C
Research Division, Frankford Arsenal, Philadelphia, Pa.