New ASTM E112 2012 Edition revises Standard Test Methods for Determining Average Grain Size

There is a new ASTM E112 2012 Edition, “Standard Test Methods for Determining Average Grain Size,” that has just been released and is available from Document Center Inc. in either paper or pdf format.  Commonly used to determine the quality of a specific alloy, the standard provides the methodology for a tester to compare the grain structure of a sample to a series of graded images using wall charts, clear plastic overlays, or a grain counting eyepiece reticle.

The widely cited ASTM E112 not only covers the measurement of average grain size by the comparison procedures (as noted above), but also the planimetric (or Jeffries) procedure and the intercept procedures.  Testers use the standard to determine the average grain size of specimens with a unimodal distribution of grain areas, diameters, or intercept lengths.

To see the differences between the new ASTM E112-12 and the previous (now obsolete) ASTM E112-10 (from 2010), you may want to purchase the redline edition.  This will give you two copies of the standard.  The current 2012 edition comes in a “clean” copy, and an additional copy of the 2010 is included with all changes “marked up.”

For determining the mean grain size, and the distribution of grain intercept lengths or grain areas, for polycrystalline metals and nonmetallic materials with equiaxed or deformed grain shapes, with uniform or duplex grain size distributions, and for single phase or multiphase grain structures, use the companion standard ASTM E1382.

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