Astm E56219 Pdf ❲LATEST | SERIES❳

ASTM E562-19 outlines a systematic manual point count method to determine the volume fraction of microstructural phases in materials. This standard enables the quantification of constituents, such as ferrite or pearlite, by superimposing a test grid over 2D microstructure images. For the full standard document, visit ASTM International.

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The Procedure

Step 1: Specimen Preparation The metallographic sample must be cut, mounted, ground, and polished to a scratch-free finish. Etching is required to reveal the phases of interest.

Step 2: Grid Selection Choose a grid spacing such that there are at least 3 to 5 grid points within the phase of interest. If the phase is small (e.g., fine pearlite), you need a finer grid. ASTM E562-19 outlines a systematic manual point count

Step 3: Systematic Scanning Move the microscope stage in a systematic raster pattern (left to right, top to bottom). Do not move randomly.

Step 4: Counting Points For each field of view, count how many grid points fall on the phase of interest. Do not "guess" at boundaries; the standard defines rules for points falling exactly on edges. ASTM International’s Compass (astm

Step 5: Total Count The standard requires a total of at least 400 to 1,000 counts (points) to achieve a 95% confidence level. For low-volume phases (e.g., 5% area), you may need to count 2,000+ points.

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Purpose and Scope

ASTM E562-19 is specifically designed for estimating the volume fraction of a single phase or constituent in a two-phase or multiphase microstructure. It applies to polished and etched sections examined using light or electron microscopy. Unlike automatic image analysis, this method relies on manual counting of points from a regular grid overlay. It is particularly useful when contrast differences between phases are insufficient for automated thresholding or when equipment for image analysis is unavailable.