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ASTM E562

ASTM E562
-Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count


 
1.INTRODUCTION
This test method may be used to determine the volume fraction of constituents in an opaque specimen using a polished, planar cross section by the manual point count procedure.
This test method describes a systematic manual point counting procedure for statistically estimating the volume fraction of an identifiable constituent or phase from sections through the microstructure by means of a point grid.
The use of automatic image analysis to determine the volume fraction of constituents is described in Practice E 1245.
 
2.Summary of Test Method
A clear plastic test grid or eyepiece reticle with regular array of test points is superimposed over the image, or a projection of the image, produced by a light microscope, scanning electron microscope, or micrograph, and the number of test points falling within the phase or constituent of interest are counted and divided by the total number of grid points yielding a point fraction,usually expressed as a percentage, for that field. The average point fraction for n measured fields gives an estimate of the volume fraction of the constituent. This method is applicable only to bulk opaque planar sections viewed with reflected light or electrons.
 
3.Acceptance Results
Corrosion specimens are observed at multiples of at least 400 of the magnifying glass, ferrite content between 35% to 65% is accepted.At the same time, microstructure should be no intermetallic phases and precipitates. Following picture is showed we did the test before, for reference purposes only.
 
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