Designation:A892−09(Reapproved2014)´1StandardGuideforDefiningandRatingtheMicrostructureofHighCarbonBearingSteels1ThisstandardisissuedunderthefixeddesignationA892;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—UnitsstatementwasinsertedinSection1.5editoriallyinOctober2014.1.Scope1.1Thisguidecoversthedescriptionofcarbidestructuresinannealedhighcarbonbearingsteels.1.2Includedisaguideforratingsteelspecimensbyagradedseriesofphotomicrographsshowingtheincidenceofcertainconditions.1.3Thereferencephotomicrographsaregradedillustrationsofannealedcarbidescategorizedbysize,network,andlamellarcontent(shape).1.4Thisguideistofacilitatecommunicationanddescrip-tionofmicrostructure.Itdoesnotestablishlimitsofaccept-ability.Suchlimitsareamatterofagreementbetweenuserandproducer.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E3GuideforPreparationofMetallographicSpecimensE407PracticeforMicroetchingMetalsandAlloysE1245PracticeforDeterminingtheInclusionorSecond-PhaseConstituentContentofMetalsbyAutomaticImageAnalysis2.2ASTMAdjuncts:PhotomicrographsforDefiningandRatingtheMicrostruc-tureofHighCarbonBearingSteels33.Apparatus3.1Inordertoadequatelycomparethestructureofaspecimenwiththephotomicrographs,itwillbenecessarytoviewaproperlypreparedsampleat1000×magnificationwithgoodresolution.4.SpecimenPreparation4.1SamplesthatrepresentaportionofthecrosssectionofthematerialshallbepreparedusingthepracticesdescribedinGuideE3.Thesizeofthesampleshallbenegotia...
