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A transparent overlay containing a regular grid array of points (usually formed by the intersections of lines) is chosen. Common grid sizes specified by the standard include: ( 25-point grid ( 49-point grid ( 100-point grid ( astm e56219 pdf
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ASTM E562-19, formally titled the Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count , is a globally recognized standard published by ASTM International. It provides a reliable, manual method for estimating the proportion (volume fraction) of specific phases or constituents within the microstructure of a solid material. The method is executed by overlaying a grid of regularly spaced points onto a two-dimensional image of a prepared material section and systematically counting the points that fall on the phase of interest. If you need a PDF copy of the
Examine multiple non-overlapping fields (approximately 30 fields are common) to ensure statistical reliability. Calculate the point fraction cap P sub p
ASTM E562-19 itself includes a condensed step-by-step guide (Annex A1) to streamline its application. This outlines a clear and logical workflow for obtaining statistically meaningful results: It provides a reliable, manual method for estimating
The test procedure involves superimposing a grid of equally spaced points (e.g., 9, 16, or more points) onto microstructure images. The operator counts how many points fall on the phase of interest across multiple fields of view. The volume fraction ( V_v ) is estimated as the number of points hitting the target phase divided by the total points counted:
Understanding ASTM E562-19: Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count
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A microscope is required, equipped with a grid reticle in the eyepiece (usually a rectangular grid with 25 or 100 points, or a grid of lines). 3. Grid Application A grid with total test points ( Ptcap P sub t ) is superimposed over the image of the microstructure.