ASTM E562-19e1 outlines a manual procedure called . Instead of calculating absolute surface areas, the test superimposes a distinct grid of points (typically crosshairs) over a series of microstructural images. By counting how many points land directly on a target phase versus the total number of grid points, operators determine a statistically representative volume fraction. Deciphering the Designation Code
) of a specific constituent, phase, or constituent in a microstructure.
Quantitative Description of the Microstructure of Duplex ... - MDPI
Do not rely on a single field of view. Move the microscope stage to a new, non-overlapping field without looking through the eyepiece to prevent selection bias. Repeat the counting process for a predetermined number of fields ( astm e562-19e1
While automatic image analysis is common, ASTM E562 remains critical in several scenarios.
Understanding the volume fraction of phases in a material is critical because it dictates the material's mechanical properties, such as tensile strength, ductility, hardness, and corrosion resistance.
is typically desired for high-precision quality control and research. A is acceptable for routine industrial screenings. ASTM E562-19e1 outlines a manual procedure called
: A transparent overlay containing a regular array of points (typically intersections of lines). Common grid sizes include (16 points), (25 points), (100 points), or circular arrays.
A complete test report according to ASTM E562-19e1 should always include:
[ P = \left( \frac1.96AP \right)^2 \left( \frac1 - V_VV_V \right) ] Deciphering the Designation Code ) of a specific
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Determining the percentage of porosity or voids in powder metallurgy components or additive manufacturing (3D printed) parts.
ASTM E562-19e1 is the standard test method for determining the volume fraction of metallic microconstituents using a systematic manual point count, serving as a reliable "referee" method for quantifying phase distribution. It is extensively applied to determine ferrite-austenite balance in stainless steels and evaluate microstructure in additive manufacturing. You can find more information about this standard at MDPI's article on steel microstructure .
When she finished, she ran the calculation: Volume fraction of voids = 11.8%.