Answer
$N= 32\ grains/inch^{2}$
Work Step by Step
Given:
ASTM grain size (n)= 6
Required:
grains per square inch under a magnification of 100x
Solution:
Using Equation 4.16, we find:
$N= 2^{n-1} = 2^{6-1} = 32\ grains/inch^{2}$
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