Grain Structure Analysis is covered by Specification ASTM E112-13 covers the measurement grain size in all single phase metals. If there are two phases, or a phase and a constituent, a combination of two methods is used as a measurement of the volume fraction of each phase.
To prepare the sample for measurement of grain structure we have suggested equipment which may be suitable. It is always good to discuss your exact application regarding size and number of samples. A range of new and used metallurgical equipment is available with full consumables support and expert advice.