ASM Handbook, Volume 9: Metallography And Microstructures by ASM

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Extra info for ASM Handbook, Volume 9: Metallography And Microstructures (ASM Handbook)

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Fig. 33: results of abrading on 600-grit silicon carbide paper. Fig. 34: improved results obtained by abrading on a fine fixed-abrasive lap. As-polished. 250× Embedding of Abrasive. The points of the contacting abrasive particles of an abrasive paper fracture readily during abrasion. These fragments may become embedded in the surface of a very soft metal, such as lead or annealed high-purity aluminum, where they are difficult to discern by optical microscopy. However, a surface with a high concentration of embedded abrasive characteristically has a rough, torn appearance (Fig.

Fig. 4: taper section (horizontal magnification 600×, vertical magnification 6060×) of surface layers that were abraded on 220-grit silicon carbide paper. Fig. 5 and 6: results of abrading on 600-grit silicon carbide paper and then polishing until about 1 μm (Fig. 5) and 3 μm (Fig. 6) of metal are removed. Figure 5 shows abrasion artifacts. Figure 6 shows the true structure. Electrolytic: oxalic acid. 500× When a surface contains artifacts of the type shown in Fig. 5, it can be assumed that a deep surface layer will have to be removed to obtain an artifact-free surface.

61). Fig. 60 Fig. 61 Fig. 62 Effect of addition of different amounts of NH4OH to the suspending liquid in vibratory polishing of a cast α-β brass. Specimens were polished with magnesia suspended in a 3:1 mixture of propylene glycol and water. Fig. 60: using no addition of NH4OH; note numerous polishing scratches. Fig. 61: using an optimum addition of NH4OH. Fig. 62: using excessive NH4OH; note excessive relief between the two phases. As-polished (etched during polishing). 500× The optimum polishing conditions are arrived at largely by experimentation, guided by a few broad principles.

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