12 December 2013 10 4K Report

We have the microstructure test specimen of various metals at the lab. I used those microstructure test specimen to calculate the grain size using the formula N*=2exp(n-1) at magnification of 100 X measured in an area of 1 sq. inch. I want to know if it is the standard method for obtaining the average grain size. Can anyone attach the American Society for Testing and Materials document ASTM E112-12?

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