ASTM E112 PDF

Corrosion ASTM E Standard Test Methods for Average Grain Size These test methods cover procedures for estimating and rules for expressing the average grain size of all metals consisting entirely, or principally, of a single phase. The test methods may also be used for any structures having appearances similar to those of the metallic structures shown in the comparison charts. The three basic procedures for grain size estimation are:Comparison Procedure. The comparison procedure does not require counting of either grains, intercepts, or intersections but, as the name suggests, involves comparison of the grain structure to a series of graded images, either in the form of a wall chart, clear plastics overlays, or an eyepiece reticle. These test methods cover the measurement of average grain size and include the comparison procedure, the planimetric or Jeffries procedure, and the intercept procedures. These test methods may also be applied to nonmetallic materials with structures having appearances similar to those of the metallic structures shown in the comparison charts.

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Need it fast? Ask for rush delivery. Most backordered items can be rushed in from the publisher in as little as 24 hours. Some rush fees may apply. Add to Cart. View Full Details and Buy. Complementary Documents and Links:. These test methods cover the measurement of average grain size and include the comparison procedure, the planimetric or Jeffries procedure, and the intercept procedures.

These test methods may also be applied to nonmetallic materials with structures having appearances similar to those of the metallic structures shown in the comparison charts. These test methods apply chiefly to single phase grain structures but they can be applied to determine the average size of a particular type of grain structure in a multiphase or multiconstituent specimen. These test methods are used to determine the average grain size of specimens with a unimodal distribution of grain areas, diameters, or intercept lengths.

These distributions are approximately log normal. These test methods do not cover methods to characterize the nature of these distributions. Characterization of grain size in specimens with duplex grain size distributions is described in Test Methods E Measurement of individual, very coarse grains in a fine grained matrix is described in Test Methods E These test methods deal only with determination of planar grain size, that is, characterization of the twodimensional grain sections revealed by the sectioning plane.

Determination of spatial grain size, that is, measurement of the size of the three-dimensional grains in the specimen volume, is beyond the scope of these test methods.

These test methods describe techniques performed manually using either a standard series of graded chart images for the comparison method or simple templates for the manual counting methods. Utilization of semi-automatic digitizing tablets or automatic image analyzers to measure grain size is described in Test Methods E These test methods deal only with the recommended test methods and nothing in them should be construed as defining or establishing limits of acceptability or fitness of purpose of the materials tested.

The measured values are stated in SI units, which are regarded as standard. Equivalent inch-pound values, when listed, are in parentheses and may be approximate. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Browse Publishers.

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ASTM E112 Test Using Grain Reticles

Historical Version s - view previous versions of standard. More E The grain size of specimens with two phases, or a phase and a constituent, can be measured using a combination of two methods, a measurement of the volume fraction of the phase and an intercept or planimetric count see Section The test methods may also be used for any structures having appearances similar to those of the metallic structures shown in the comparison charts. The three basic procedures for grain size estimation are:.

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Standard Test Methods for Determining Average Grain Size

ASTM E has standard test methods for average grain sizing. The comparison method does not require the tester to count grains, but rather comparing of the grain structure to a series of graded images, either in the form of a wall chart, clear plastic overlays, or a grain counting eyepiece reticle. There appears to be a general bias in that comparison grain size ratings claim that the grain size is somewhat coarser than it actually is. Test Method E , one of the most widely cited ASTM standards, is concerned with the measurement of grain size when the grains are equiaxed in shape non-deformed , although it does contain some information about measurement of grain size when the grains have been elongated by processing. There are other situations where Test Method E is not helpful and other standards have been developed. For example, certain alloys may not exhibit a uniform distribution of grain sizes. Each of these grain reticles was created for use with a 10x microscope objective.

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ASTM E112 Standard Test Methods for Average Grain Size

Active view current version of standard. Other Historical Standards. More E These test methods may also be applied to nonmetallic materials with structures having appearances similar to those of the metallic structures shown in the comparison charts. These test methods apply chiefly to single phase grain structures but they can be applied to determine the average size of a particular type of grain structure in a multiphase or multiconstituent specimen.

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