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ISO 9042:1988 Steels - Manual point counting method for statistically estimating the volume fraction of a constituent with a point grid
standard by International Organization for Standardization, 12/01/1988
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Applies to constituents (a phase as well as a micrographic constituent composed of two or more phases) which are clearly identifiable. The point grid is superimposed a given number of fields of the observed surface. By counting the number of points the volume fraction is calculated.