Designation: E 112 – 96 (Reapproved 2004) e2Standard Test Methods forDetermining Average Grain Size1This standard is issued under the fixed designation E 112; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use byagencies of the Department of Defense.e1 NOTE—Reference (2) was editorially corrected in May 2006.e2 NOTE— Equation A1.9 was editorially corrected in November 2006.INTRODUCTIONThese test methods of determination of average grain size in metallic materials are primarilymeasuring procedures and, because of their purely geometric basis, are independent of the metal oralloy concerned. In fact, the basic procedures may also be used for the estimation of average grain,crystal, or cell size in nonmetallic materials. The comparison method may be used if the structure ofthe material approaches the appearance of one of the standard comparison charts. The intercept andplanimetric methods are always applicable for determining average grain size. However, thecomparison charts cannot be used for measurement of individual grains.1. Scope1.1 These test methods cover the measurement of averagegrain size and include the comparison procedure, the planimet-ric (or Jeffries) procedure, and the intercept procedures. Thesetest methods may also be applied to nonmetallic materials withstructures having appearances similar to those of the metallicstructures shown in the comparison charts. These test methodsapply chiefly to single phase grain structures ...
