Field Metallurgical Replication (FMR), in field metallography, is the use of metallurgical preparation on surfaces in the field, by polishing to a mirror image, along with application of acetate or other thin plastic films designed to nondestructively duplicate the microstructure of a part or structure in-situ.
Field Metallurgical Replication (FMR) is about conducting metallurgical preparations on-site, including polishing surfaces to a mirror-like finish and using acetate or similar thin plastic films to create non-destructive replicas of a part's microstructure without altering the original specimen.