Astm E562-19e1 [best]
ASTM E562-19e1 is a standard test method developed by the American Society for Testing and Materials (ASTM) that provides a procedure for point counting by random manual point counting. This method involves using a microscope to count the number of points that fall on a specific phase or feature within a material's microstructure. The standard was last updated in 2019 and includes the e1 designation, which indicates that it is an editorially corrected version.
: Capable of reflecting light to view polished and etched specimens.
: While modern laboratories often use automated image analysis software (governed by standards like ASTM E1245
of various phases or constituents in a metal's microstructure using a systematic manual point-count procedure. Formally titled the
Understanding ASTM E562-19e1: The Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count astm e562-19e1
The choice between utilizing manual stereology and automated digital image thresholding depends heavily on specific laboratory capabilities, budgets, and sample characteristics. Feature / Metric ASTM E562-19e1 (Manual Point Count) ASTM E1245 / Digital Image Thresholding
P̄=∑Pincap P bar equals the fraction with numerator sum of cap P sub i and denominator n end-fraction Standard Deviation (
: Count as 1 if the grid intersection falls completely within the phase of interest.
: A transparent test grid featuring a specific number of cleanly intersecting points ( PTcap P cap T ASTM E562-19e1 is a standard test method developed
Measuring porosity (the volume of empty spaces) is essential for validating the structural integrity of 3D-printed metal parts.
To verify compliance with ASTM E562, calculate the Relative Accuracy ( RAcap R cap A ). The standard generally targets an RAcap R cap A of
Point counting is relied upon across global manufacturing and metallurgical failure analysis sectors:
) obtained from a random section is an unbiased estimator of the of that phase. Core Methodology: Step-by-Step : Capable of reflecting light to view polished
. This tells the engineer not just the volume fraction, but the margin of error (e.g., Relative Accuracy
“Vega, I need a cross-section of the strut,” Aris ordered. “Etch it with nital. I’m coming down.”
A transparent overlay grid containing a specific number of systematically arranged intersections (points) is placed over the image. Common grid sizes include: ( 25 points ( 49 points ( 100 points (
ASTM E562-19e1 is a widely accepted, foundational manual test method for determining the volume fraction of microstructural phases by superimposing a grid over a micrograph. Considered an economical and relatively simple technique, it is ideal for smaller labs, though it is highly operator-dependent, slow, and can have errors exceeding 10%. For a detailed overview, visit Infinita Lab .
To fulfill the verification protocols demanded by ASTM E562-19e1, operators calculate the mean value and determine the standard deviation across multiple independent microscopic fields of view.