5.1 These test methods cover procedures 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.

5.2 The measurements are performed using semiautomatic digitizing tablet image analyzers or automatic image analyzers. These devices relieve much of the tedium associated with manual measurements, thus permitting collection of a larger amount of data and more extensive sampling which will produce better statistical definition of the grain size than by manual methods.

5.3 The precision and relative accuracy of the test results depend on the representativeness of the specimen or specimens, quality of specimen preparation, clarity of the grain boundaries (etch technique and etchant used), the number of grains measured or the measurement area, errors in detecting grain boundaries or grain interiors, errors due to detecting other features (carbides, inclusions, twin boundaries, and so forth), the representativeness of the fields measured, and programming errors.

5.4 Results from these test methods may be used to qualify material for shipment in accordance with guidelines agreed upon between purchaser and manufacturer, to compare different manufacturing processes or process variations, or to provide data for structure-property-behavior studies.

1.1 These test methods are used to determine grain size from measurements of grain intercept lengths, intercept counts, intersection counts, grain boundary length, and grain areas.

1.2 These measurements are made with a semiautomatic digitizing tablet or by automatic image analysis using an image of the grain structure produced by a microscope.

1.3 These 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.

1.4 These test methods are applicable to measurement of other grain-like microstructures, such as cell structures.

1.5 This 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.

1.6 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.

1.7 The 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