ASTM-E1382:2023 Edition

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E1382-97(2023) Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis

Published By	Publication Date	Number of Pages
ASTM	2023	24

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Description

ASTM E1382-97-Reapproved2023

Active Standard: Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis

ASTM E1382

Scope

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 The sections appear in the following order:

1.7 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Keywords

ALA grain size; anisotropy index; area fraction; ASTM grain size number; austenite grains; automatic image analysis; calibration; chord length; confidence level; digitizing tablet; duplex grain structures; equiaxed grains; etchant; ferrite grains; grain boundary; grains; grain size; intercept length; intersection count; magnification; non-equiaxed grains; polycrystalline; prior-austenite grain boundaries; relative accuracy; semiautomatic image analysis; skeletonization; standard deviation; twin boundary; watershed segmentation.;

ICS Code

ICS Number Code 13.300 (Protection against dangerous goods)

DOI: 10.1520/E1382-97R23

Additional information

Referenced Documents	2
Precision and Bias	16
Grain Size of Non-Equiaxed Grain Structure Specimens	Annex A1
Sampling	8
Intercept and Intersection Counts	12.4
Grain Boundary Length	13.5
Definitions of Terms Specific to This Standard	3.2
Individual Chord (Intercept) Lengths	13.7.4
Test Specimens	9
Calibration	11
Section	Section
Significance and Use	5
Scope	1
Definitions	3.1
Specimen Preparation	10
Calculation of Results	14
Apparatus	7
Individual Grain Areas	13.9.4
Automatic Image Analysis	13
Procedure:
Terminology	3
Intercept Lengths	12.3
Symbols	3.3
Grain Counts	13.8
Examples of Proper and Improper Grain Boundary Delineation	Annex A2
Mean Grain Area/Field	13.9
Interferences	6
Intersection Counts	13.6
Mean Chord (Intercept) Length/Field	13.7.2
Two-Phase Grain Structures	13.10
ALA Grain Size	13.9.8
Summary of Test Method	4
Semiautomatic Digitizing Tablet	12
Grain Areas	12.6
Test Report	15