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A new multilayer abrasive grinding disk has been developed to overcome the grinding and polishing problems associated with metallographic specimen preparation. These problems are discussed in detail. The discussion focuses on the contributing factors of poor specimen preparation, how they affect the surface, and how they are alleviated. The difficulties of surface deformation, edge rounding, soft-phase undercutting, pullout, and chipping of brittle specimens are reviewed together with their root causes. This foundation was used to design a superior grinding system employing the benefits of diamond.
Micrographs of specimens prepared using conventional techniques are compared to that of the new grinding system. The micrographs illustrate that edge rounding and soft-phase undercutting can be eliminated with chipping and pullout greatly reduced. Other examples show that the new grinding system greatly improves the specimen surface finish and that three grinding disks of the new design can replace five or six conventional grinding and polishing steps.
specimen grinding, specimen polishing, specimen undercutting, edge rounding, surface deformation, chipping, diamond abrasives, cubic boron nitride, metallography, metallurgical specimens, microstructure, metallographic techniques
President, TBW Industries, Inc., Furlong, PA