The standard provides specific calculations to ensure the reliability of the results: Average Volume Fraction ( Ppcap P sub p
: Measurements must be taken on different fields of view. Repeatedly counting the same micrograph is not permitted by the standard. astm e56219 pdf
The accuracy of the ASTM E562-19 method depends on rigorous sample preparation and systematic field selection. The standard provides specific calculations to ensure the
: A transparent grid with equally spaced points is superimposed over a specimen image (micrograph or viewing screen). Points falling within the phase of interest are counted across multiple fields to achieve statistical significance. The Point Counting Procedure : A transparent grid with equally spaced points
The primary goal of ASTM E562-19 is to offer a standardized, unbiased, and simple procedure for quantifying microstructural features. While automated image analysis is covered under ASTM E1245 , E562 remains a critical benchmark for manual verification and research.
: It applies to opaque materials where distinct phases can be identified, such as metals and alloys (e.g., ferrite in duplex stainless steel), ceramics , and composites .
