Proper grain size determination?
Proper grain size determination?
(OP)
Am I doing this correctly? I get an mean intercept of about 0.23 mm measured at 30x. Per ASTM E112, the G0=1=(-3.2877-6.64398log(0.23)). The Q=6.6439*log(30/100)=-3.5, so the ASTM grain size (microscopically determined) is -2.5?





RE: Proper grain size determination?
RE: Proper grain size determination?
I think the second equation you are using is likely used if you are determining grain size by the comparison method at a magnification other than 100X.