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Ferrite Testing

Volume fraction estimate of δ-ferrite by manual point count per ASTM E562

Volume fraction estimate of δ-ferrite by manual point counting per ASTM E562 in stainless steels and related alloys is accomplished by use of an optical microscopy metallographic technique involving grid point counting.  This technique operates under the stereological principal that a grid with a number of uniformly spaced points, when systematically placed over an image, can provide an estimation of the volume fraction on an identifiable constituent.  After observing a given number of fields for a region of interest, an unbiased statistical estimation of the volume fraction of an identifiable consistent or phase (δ-ferrite) can be calculated to the desired level of confidence.


 

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