ASTM E930-1999(2007) 评价在金相磨片中观察到的最大晶粒(ALA晶粒)的标准试验方法

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【英文标准名称】:StandardTestMethodsforEstimatingtheLargestGrainObservedinaMetallographicSection(ALAGrainSize)
【原文标准名称】:评价在金相磨片中观察到的最大晶粒(ALA晶粒)的标准试验方法
【标准号】:ASTME930-1999(2007)
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:E04.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:金属;粒度;金相学
【英文主题词】:ALAgrain;caliperdiameter;comparisonprocedure;ellipsemeasurement;grainsize;largestgrain;measuringprocedure;metallography;microstructure;outliergrain;point-countprocedure
【摘要】:Thepresenceoflargegrainshasbeencorrelatedwithanomalousmechanicalbehaviorin,forexample,crackinitiation,crackpropagation,andfatigue.ThusthereisengineeringjustificationforreportingtheALAgrainsize.Thesemethodsshallonlybeusedwiththepresenceofoutliercoarsegrains,3ormoreASTMgrainsizenumberslargerthantherestofthemicrostructureandcomprising5%orlessofthespecimenarea.AtypicalexampleisshowninAnnexA1asFig.A1.1.Thesemethodsshallnotbeusedforthedeterminationofaveragegrainsize,whichistreatedinTestMethodsE112.ExamplesofmicrostructuresthatdonotqualifyforALAtreatmentareshowninAnnexA1asFig.A1.2,Fig.A1.3,andFig.A1.4.Thesemethodsmaybeappliedinthecharacterizationofduplexgrainsizes,asinstructedintheproceduresforTestMethodsE1181.1.1Thesetestmethodsdescribesimplemanualproceduresformeasuringthesizeofthelargestgraincross-sectionobservedonametallographicallypreparedplanesection.1.2Thesetestmethodsshallonlybevalidformicrostructurescontainingoutliercoarsegrains,wheretheirpopulationistoosparseforgrainsizedeterminationbyTestMethodsE112.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H24
【国际标准分类号】:19_120
【页数】:6P.;A4
【正文语种】: