Standard Test Methods for

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1、Designation:E112−13StandardTestMethodsfor1DeterminingAverageGrainSizeThisstandardisissuedundertheÞxeddesignationE112;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatesthe

2、yearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.INTRODUCTIONThesetestmethodsofdeterminationofaveragegrainsizeinmetallicmaterialsareprimarilymeasu

3、ringproceduresand,becauseoftheirpurelygeometricbasis,areindependentofthemetaloralloyconcerned.Infact,thebasicproceduresmayalsobeusedfortheestimationofaveragegrain,crystal,orcellsizeinnonmetallicmaterials.Thecomparisonmethodmaybeusedifthestructureofthematerialapproachesth

4、eappearanceofoneofthestandardcomparisoncharts.Theinterceptandplanimetricmethodsarealwaysapplicablefordeterminingaveragegrainsize.However,thecomparisonchartscannotbeusedformeasurementofindividualgrains.1.Scope1.4Thesetestmethodsdescribetechniquesperformedmanuallyusingeith

5、erastandardseriesofgradedchartimages1.1Thesetestmethodscoverthemeasurementofaverageforthecomparisonmethodorsimpletemplatesforthemanualgrainsizeandincludethecomparisonprocedure,theplanim-countingmethods.Utilizationofsemi-automaticdigitizingetric(orJeffries)procedure,andth

6、einterceptprocedures.tabletsorautomaticimageanalyzerstomeasuregrainsizeisThesetestmethodsmayalsobeappliedtononmetallicdescribedinTestMethodsE1382.materialswithstructureshavingappearancessimilartothoseofthemetallicstructuresshowninthecomparisoncharts.These1.5Thesetestmeth

7、odsdealonlywiththerecommendedtesttestmethodsapplychießytosinglephasegrainstructuresbutmethodsandnothinginthemshouldbeconstruedasdeÞningtheycanbeappliedtodeterminetheaveragesizeofaparticularorestablishinglimitsofacceptabilityorÞtnessofpurposeoftypeofgrainstructureinamulti

8、phaseormulticonstituentthematerialstested.specimen.1.6ThemeasuredvaluesarestatedinSIunits,whichare1.2Th