ASM Handbook, Volume 9: Metallography And Microstructures by ASM

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

Sample text

The specimen is held against the working surface of a wheel and rotated slowly in a direction opposite that of the wheel. The next step involves handling the specimen. This is more difficult because the specimen must be held and rotated so that the section surface is maintained precisely in a horizontal plane against the working surface of the abrasive or polishing wheel. The full surface must maintain contact with the working surface. The specimen should be rotated counter to the direction of wheel rotation.

Fig. 45: specimen was, polished on 10- to 20-μm Al2O3 on billiard cloth. Fig. 46: specimen was polished on 4- to 8-μm diamond on synthetic suede cloth. Both specimens were abraded on a fixed-abrasive lap before polishing. Aspolished. 350× Fig. 47 Fig. 48 Comparison of polishing methods for showing phases in Al-13Si alloy. Fig. 47: specimen was polished on 10- to 20-μm Al2O3 on billiard cloth. Fig. 48: specimen was polished on 4- to 8-μm diamond on a synthetic suede cloth. Both specimens were abraded on a fixed-abrasive lap before polishing.

48 Comparison of polishing methods for showing phases in Al-13Si alloy. Fig. 47: specimen was polished on 10- to 20-μm Al2O3 on billiard cloth. Fig. 48: specimen was polished on 4- to 8-μm diamond on a synthetic suede cloth. Both specimens were abraded on a fixed-abrasive lap before polishing. As-polished. 250× Retention of Graphite in Gray Iron. Earlier in this article it was demonstrated that although the graphite in cast iron can be damaged severely by abrasion, it is possible by suitable choice of abrasion process to obtain a reasonably true representation of the structure.

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