【英文标准名称】:StandardPracticeforAssessingtheDegreeofBandingorOrientationofMicrostructures
【原文标准名称】:评定显微结构带状物等级或取向的标准实施规范
【标准号】:ASTME1268-2001(2007)
【标准状态】:现行
【国别】:
【发布日期】:2001
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:E04.14
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:微观结构;显微照片
【英文主题词】:anisotropyindex;banding;featureinterceptions;featureintersections;microindentionhardness;orientation;steel;stereology
【摘要】:Thispracticeisusedtoassessthenatureandextentofbandingororientationofmicrostructuresofmetalsandothermaterialswheredeformationandprocessingproduceabandedororientedcondition.Bandedororientedmicrostructurescanariseinsinglephase,twophaseormultiphasemetalsandmaterials.Theappearanceoftheorientationorbandingisinfluencedbyprocessingfactorssuchasthesolidificationrate,theextentofsegregation,thedegreeofhotorcoldworking,thenatureofthedeformationprocessused,theheattreatments,andsoforth.Microstructuralbandingororientationinfluencetheuniformityofmechanicalpropertiesdeterminedinvarioustestdirectionswithrespecttothedeformationdirection.Thestereologicalmethodscanbeappliedtomeasurethenatureandextentofmicrostructuralbandingororientationforanymetalormaterial.Themicroindentationhardnesstestprocedureshouldonlybeusedtodeterminethedifferenceinhardnessinbandedheat-treatedmetals,chieflysteels.Isolatedsegregationmayalsobepresentinanotherwisereasonablyhomogeneousmicrostructure.Stereologicalmethodsarenotsuitableformeasuringindividualfeatures,insteadusestandardmeasurementprocedurestodefinethefeaturesize.Themicroindentationhardnessmethodmaybeusedforsuchstructures.Resultsfromthesetestmethodsmaybeusedtoqualifymaterialforshipmentinaccordancewithguidelinesagreeduponbetweenpurchaserandmanufacturer,forcomparisonofdifferentmanufacturingprocessesorprocessvariations,ortoprovidedataforstructure-property-behaviorstudies.1.1Thispracticedescribesaproceduretoqualitativelydescribethenatureofbandedororientedmicrostructuresbasedonthemorphologicalappearanceofthemicrostructure.1.2Thispracticedescribesstereologicalproceduresforquantitativemeasurementofthedegreeofmicrostructuralbandingororientation.Note18212;Althoughstereologicalmeasurementmethodsareusedtoassessthedegreeofbandingoralignment,themeasurementsareonlymadeonplanesparalleltothedeformationdirection(thatis,alongitudinalplane)andthethree-dimensionalcharacteristicsofthebandingoralignmentarenotevaluated.1.3Thispracticedescribesamicroindentationhardnesstestprocedureforassessingthemagnitudeofthehardnessdifferencespresentinbandedheat-treatedsteels.Forfullymartensiticcarbonandalloysteels(0.10-0.65%C),intheas-quenchedcondition,thecarboncontentofthematrixandsegregatemaybeestimatedfromthemicroindentationhardnessvalues.1.4Thisstandarddoesnotcoverchemicalanalyticalmethodsforevaluatingbandedstructures.1.5Thispracticedealsonlywiththerecommendedtestmethodsandnothinginitshouldbeconstruedasdefiningorestablishinglimitsofacceptability.1.6ThemeasuredvaluesarestatedinSIunits,whichareregardedasstandard.Equivalentinch-poundvalues,whenlisted,areinparenthesesandmaybeapproximate.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H24
【国际标准分类号】:07_030
【页数】:29P.;A4
【正文语种】: