ASTM_E112-2010

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1、Designation:E11210StandardTestMethodsfor1DeterminingAverageGrainSizeThisstandardisissuedundertheÞxeddesignationE112;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreappro

2、val.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.INTRODUCTIONThesetestmethodsofdeterminationofaveragegrainsizeinmetallicmaterialsareprimarilymeasuringproceduresand,becauseoftheirpurel

3、ygeometricbasis,areindependentofthemetaloralloyconcerned.Infact,thebasicproceduresmayalsobeusedfortheestimationofaveragegrain,crystal,orcellsizeinnonmetallicmaterials.Thecomparisonmethodmaybeusedifthestructureofthematerialapproachestheappearanceofoneofthestandardcomparisoncharts.Theinte

4、rceptandplanimetricmethodsarealwaysapplicablefordeterminingaveragegrainsize.However,thecomparisonchartscannotbeusedformeasurementofindividualgrains.1.Scope1.4Thesetestmethodsdescribetechniquesperformed1.1Thesetestmethodscoverthemeasurementofaveragemanuallyusingeitherastandardseriesofgra

5、dedchartimagesgrainsizeandincludethecomparisonprocedure,theplanimet-forthecomparisonmethodorsimpletemplatesforthemanualric(orJeffries)procedure,andtheinterceptprocedures.Thesecountingmethods.Utilizationofsemi-automaticdigitizingtestmethodsmayalsobeappliedtononmetallicmaterialswithtablet

6、sorautomaticimageanalyzerstomeasuregrainsizeisstructureshavingappearancessimilartothoseofthemetallicdescribedinTestMethodsE1382.structuresshowninthecomparisoncharts.Thesetestmethods1.5Thesetestmethodsdealonlywiththerecommendedtestapplychießytosinglephasegrainstructuresbuttheycanbemethod

7、sandnothinginthemshouldbeconstruedasdeÞningappliedtodeterminetheaveragesizeofaparticulartypeoforestablishinglimitsofacceptabilityorÞtnessofpurposeofgrainstructureinamultiphaseormulticonstituentspecimen.thematerialstested.1.2Thesetestmethodsareusedtodeterminetheaverage1.6Themeas