ASTM E112 PDF
ASTM E methods for grain counting using microscope reticle. ASTM E GRAIN SIZE MEASURING METHODS, metallurgy, american society for testing and materials. ASTM E standard is commonly practiced within the United States for determining the quality of a specific alloy. This standard is routinely performed by .
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Historical Version s – view previous versions of standard. The grain size of specimens with two phases, or a phase and a constituent, can be measured using a asym of two methods, a measurement of the volume fraction of the phase and an intercept or aastm 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.
ASTM E – 13 Standard Test Methods for Determining Average Grain Size
The three basic procedures for grain size estimation are:. The precision of the method is a function of the number of grains counted.
An accurate count does require marking off of the grains as they are counted. The precision of the method w112 a function of the number of intercepts or intersections counted. Because an accurate count can be made without need of marking off intercepts or intersections, the intercept method is faster than the planimetric method for the same level of precision.
For higher degrees of accuracy in determining average grain size, the intercept or planimetric procedures may be used. The zstm procedure is particularly useful for structures consisting of elongated grains see Section Partially recrystallized wrought alloys and lightly to moderately cold-worked material may be considered as consisting of non-equiaxed grains, if a grain size measurement is necessary.
Grain Size Examination – ASTM E Grain Size Analysis | SGS MSi Testing
These charts were constructed to reflect the typical log-normal distribution of grain sizes that result when a plane is passed through a three-dimensional array of grains. Because they show a distribution of grain dimensions, ranging from very small to very large, depending on the relationship of the planar section and the three-dimensional array of grains, the charts are not applicable to measurement of individual grains. 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 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 aastm a fine grained matrix is described in Test Methods E Determination of spatial grain size, that is, measurement of the aastm of the three-dimensional grains in the specimen volume, is beyond the scope of these test methods.
ASTM E112 Grain Size Examination
Utilization of semi-automatic digitizing tablets or automatic image analyzers to measure grain size is described in Test Methods E Equivalent inch-pound values, when listed, are in parentheses and may be approximate. 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.
Results of Interlaboratory Grain Size Determinations. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part asrm the f112. Historical Version s – view previous versions of standard Translated Version s: The three basic procedures for grain size estimation are: Heyn Linear Intercept Procedure. Specimens with Non-equiaxed Grain Shapes. Fracture Grain Size Method.
Application to Special Situations. Link to Active This link will always route to the current Active version of the standard.