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Description of ASTM-E1382 2010ASTM E1382 - 97(2010)Standard Test Methods for Determining Average Grain Size Using Semiautomatic and Automatic Image AnalysisActive Standard ASTM E1382 | Developed by Subcommittee: E04.14 Book of Standards Volume: 03.01
Translated Standard: Russian ASTM E1382Significance and Use 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. 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. 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. 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. 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 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:
ASTM Standards E3 Guide for Preparation of Metallographic Specimens E7 Terminology Relating to Metallography E112 Test Methods for Determining Average Grain Size E407 Practice for Microetching Metals and Alloys E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count E883 Guide for Reflected-Light Photomicrography E930 Test Methods for Estimating the Largest Grain Observed in a Metallographic Section (ALA Grain Size) E1181 Test Methods for Characterizing Duplex Grain Sizes E1245 Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image Analysis 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; ALA grain size; Anisotropy index; ASTM grain size number (G); Calibration--metals/alloys analysis instrumentation; Digitizing tablet; Duplex grain structures; Equiaxed grains; Etching (materials/process); Image analysis--metals/metallic materials; Intercept length/count; Metallographic analysis/inspection; Metals and metallic materials; Microscopic examination--metals/alloys; Microstructures; Nonequiaxed grains; Nonmetallic materials; Photomicrography; Polycrystalline materials; Semi-automated methods; Specimen preparation (for testing)--metals/alloys; Watershed segmentation; ICS Code ICS Number Code 19.120 (Particle size analysis. Sieving) DOI: 10.1520/E1382-97R10 ASTM International is a member of CrossRef. ASTM E1382This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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