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

Standard No.

ASTM E1382-97(2023)

Release Date

2023

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM E1382-97(2023)

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: Section Section Scope 1 Referenced Documents 2 Terminology 3 Definitions 3.1 Definitions of Terms Specific to This Standard 3.2 Symbols 3.3 Section Section 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 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 These test methods are under the jurisdiction of ASTM Committee E04 on Metallography and are the direct responsibility of Subcommittee E04.14 on Quantitative Metallography. Current edition approved April 1, 2023. Published May 2023. Originally approved in 1991. Last previous edition approved in 2015 as E1382 – 97(2015). DOI: 10.1520/E1382-97R23. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 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. 1 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.

ASTM E1382-97(2023) Referenced Document

• ASTM E112 Standard Test Methods for Determining Average Grain Size
• ASTM E1181 Standard Test Methods for Characterizing Duplex Grain Sizes
• ASTM E1245 Standard Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image Analysis
• ASTM E3 Standard Practice for Preparation of Metallographic Specimens
• ASTM E407 Standard Practice for Microetching Metals and Alloys
• ASTM E562 Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count
• ASTM E7 Standard Terminology Relating to Metallography
• ASTM E883 Standard Guide for Reflected-Light Photomicrography
• ASTM E930 Standard Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size)

ASTM E1382-97(2023) history

• 2023 ASTM E1382-97(2023) Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis
• 1997 ASTM E1382-97(2015) Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis
• 1997 ASTM E1382-97(2010) Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis
• 1997 ASTM E1382-97(2004) Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis
• 1997 ASTM E1382-97 Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image Analysis