: To provide a statistically valid estimate of the volume fraction of an identifiable phase or constituent in a metallographic specimen.
: It uses a grid of points overlaid on a microstructure image. A technician counts how many points fall on the phase of interest to calculate its percentage of the total volume. astm e56219 pdf
ASTM E562-19 outlines a systematic manual point-count procedure to determine the volume fraction of microstructural constituents in materials, utilizing a grid-based overlay for statistical estimation. This standard, which supports accurate phase identification, provides a 95% confidence interval for measuring constituent ratios in metals, ceramics, and composites. Purchase the official ASTM E562-19 PDF from ASTM International ASTM International : To provide a statistically valid estimate of
The accuracy of the ASTM E562-19 method depends on rigorous sample preparation and systematic field selection. which supports accurate phase identification