1.1These test methods are used to determine grain size from measurements of grain intercept lengths, intercept counts, intersection counts, grain boundary length, and grain areas.
1.2These measurements are made with a semiautomatic digitizing tablet or by automatic image analysis using an image of the grain structure produced by a microscope.
1.3These test methods are applicable to any type of grain structure or grain size distribution as long as the grain boundaries can be clearly delineated by etching and subsequent image processing, if necessary.
1.4These test methods are applicable to measurement of other grain-like microstructures, such as cell structures.
1.5This standard deals only with the recommended test methods and nothing in it should be construed as defining or establishing limits of acceptability or fitness for purpose of the materials tested.
1.6This 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.
1.7The sections appear in the following order:
| Section | Section |
| Scope | 1 |
| Referenced Documents | 2 |
| Terminology | 3 |
| Definitions | 3.1 |
| Definitions of Terms Specific to This Standard | 3.2 |
| Symbols | 3.3 |
| Summary of Test Method | 4 |
| Significance and Use | 5 |
| Interferences | 6 |
| Apparatus | 7 |
| Sampling | 8 |
| Test Specimens | 9 |
| Specimen Preparation | 10 |
| Calibration | 11 |
| Procedure: | |
| Semiautomatic Digitizing Tablet | 12 |
| Intercept Lengths | 12.3 |
| Intercept and Intersection Counts | 12.4 |
| Grain Counts | 12.5 |
| Grain Areas | 12.6 |
| ALA Grain Size | 12.6.1 |
| Two-Phase Grain Structures | 12.7 |
| Procedure: | |
| Automatic Image Analysis | 13 |
| Grain Boundary Length | 13.5 |
| Intersection Counts | 13.6 |
| Mean Chord (Intercept) Length/Field | 13.7.2 |
| Individual Chord (Intercept) Lengths | 13.7.4 |
| Grain Counts | 13.8 |
| Mean Grain Area/Field | 13.9 |
| Individual Grain Areas | 13.9.4 |
| ALA Grain Size | 13.9.8 |
| Two-Phase Grain Structures | 13.10 |
| Calculation of Results | 14 |
| Test Report | 15 |
| Precision and Bias | 16 |
| Grain Size of Non-Equiaxed Grain Structure Specimens | Annex A1 |
| Examples of Proper and Improper Grain Boundary Delineation | Annex A2 |
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