ASM Handbook, Volume 9: Metallography And Microstructures by ASM

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Fig. 25: results of abrading on a fine fixed-abrasive lap. See also the taper section in Fig. 26, 27, and 28. As-polished. 500× Fig. 26 Fig. 27 Fig. 28 Longitudinal taper sections of abraded surfaces in gray iron (horizontal magnification 1000×, vertical magnification 10,000×). Fig. 26: results of abrading on 220-grit silicon carbide paper. Fig. 27: results of abrading on 600-grit silicon carbide paper. Fig. 28: results of abrading on a fine fixed-abrasive lap. Picral Because problems in preserving graphite correctly also arise during polishing, it is unwise to rely on subsequent polishing to correct damage introduced by abrasion.

8) A mixed structure of recrystallized grains and parent-metal grains containing deformation twins Parent-metal grains containing deformation twins that are likely to be aligned in bands in the direction of the initiating abrasion scratches (Fig. 9) When polishing has been continued long enough for removal of the abrasion-damaged layer, the true structure may be observed (Fig. 10). Efficient preparation procedures depend on avoiding the production of deep abrasion-damaged layers prior to polishing, eliminating the need for removing them by excessive polishing.

Mount Marking and Storage After mounting, specimens are usually identified using hand scribers or vibrating-point engravers. Markings made with these tools can then be inked over to increase their visibility. If a transparent mounting material is used, a small metal tag or piece of paper bearing the identification can be included in the mount. An indelible ink must be used, but identification is then permanently visible and protected with the specimen. Specimens are usually stored in a dessicator to minimize surface oxidation during preparation and examination.

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