Astm E562-19e1 [exclusive] -

The standard explicitly notes limitations:

ASTM E562-19e1 is the current industry standard for the Systematic Manual Point Count astm e562-19e1

The core purpose of this standard is to provide a to estimate the volume fraction of a constituent in a microstructure. The fundamental principle is based on the Delesse principle (1847), which states that the area fraction of a phase on a random planar section is equal to its volume fraction in the material. The standard explicitly notes limitations: ASTM E562-19e1 is

Essential for its niche, but showing its age. Cathodic protection (CP) is a technique used to

The standard provides tables linking expected volume fraction, desired relative error, and required total grid points. For a phase at 10% volume fraction, to achieve 5% relative error, you need approximately 400 hits → 400 / 0.10 = 4,000 total grid points.

ASTM E562-19e1 is a standard that provides guidelines for the systematic scanning of a metal or metallic surface to assess its relevance to cathodic protection. Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. The standard, officially known as "Standard Practice for Systematic Scanning of a Metal or Metallic Surface for Relevance to Cathodic Protection," was last updated in 2019 and includes a notable revision (denoted by "19e1").

By following its systematic sampling plan, respecting its statistical guidelines, and properly preparing samples, users can achieve volume fraction estimates accurate enough for R&D, quality assurance, and failure analysis – all with just a microscope, a grid, and careful attention.