Astm: E562-19e1

High; human operators easily distinguish phases despite slight etching gradients or artifacts.

ASTM E562 expresses precision as Percent Relative Accuracy (%RA). A lower %RA indicates higher confidence. It is calculated as:

: Utilized to measure volumetric porosity in 3D-printed alloys and graphitic nodularity or phase distribution in specialized cast irons.

The designation indicates a standard originally developed or majorly revised in 2019, with its first editorial correction ("e1") applied to maintain accuracy. This standard describes a stereological procedure where an operator superimposes a structured grid of points over a microstructural image (via an optical microscope, scanning electron microscope, or digital display) and manually counts how many points fall within the phase of interest.

s=∑(Pi−P̄)2N−1s equals the square root of the fraction with numerator sum of open paren cap P sub i minus cap P bar close paren squared and denominator cap N minus 1 end-fraction end-root P̄cap P bar is the average point count per field ( Relative Accuracy ( RAcap R cap A astm e562-19e1

The ASTM E562 method is a meticulous, step-by-step process that balances the need for statistical accuracy with practical laboratory procedures.

Aris shook her head. “No. But we have 48 hours before critical failure. E562 gave us the precise void fraction. That number lets us calculate exactly how long the struts will hold. We can evacuate.”

: It can be applied to any solid material—metals, ceramics, or polymers—provided a clear two-dimensional section can be prepared.

It is important to note that standards are living documents. ASTM has opened a for the revision of E562–19e1. The stated rationale is "review and modernization" of the standard. While the fundamental principles are not expected to change, a future revision (likely E562–25 or similar) may include updated references, clarifications of procedures, or new annexes incorporating modern best practices. It is calculated as: : Utilized to measure

Extremely Fast; processes dozens of fields of view within seconds.

The fundamental premise of ASTM E562-19e1 relies on the Delesse principle, which dictates that the volume fraction of a phase in a 2D plane is statistically equal to the area fraction, and consequently, the volume fraction in a 3D structure.

), typically a square pattern of 16, 25, 49, or 100 points, is superimposed onto the live or captured microstructure image.

Quantifying lamellar vs. equiaxed structures in cyclic induction heat-treated TiAl alloys directly predicts forging yields and high-temperature creep performance. Try again later.

Aris tapped the standard’s code on her tablet. . “Because someone, decades ago, decided that counting dots on a grid wasn’t boring. It was the difference between guessing and knowing. Between hope and a body count.”

P̄P=∑Pin⋅Ncap P bar sub cap P equals the fraction with numerator sum of cap P sub i and denominator n center dot cap N end-fraction Picap P sub i = Sum of points counted in the -th field. = Total number of fields examined. = Total number of points on the test grid (e.g., 25). Calculating the Standard Deviation (

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