ASTM E2283-2008 在钢铁和其它微结构特点中非金属内含物的极值分析的标准实施规程

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【英文标准名称】:StandardPracticeforExtremeValueAnalysisofNonmetallicInclusionsinSteelandOtherMicrostructuralFeatures
【原文标准名称】:在钢铁和其它微结构特点中非金属内含物的极值分析的标准实施规程
【标准号】:ASTME2283-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:E04.09
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:extremevaluestatistics;inclusionlength;maximuminclusionlength;maximumlikelihoodmethod;Extremevaluestatistics;Inclusionlength;Inclusions;Indigenousinclusions;Maximuminclusionlength;Metallographicanalysis/inspection;Microstructure
【摘要】:Thispracticeisusedtoassesstheindigenousinclusionsorsecond-phaseconstituentsinmetalsusingextremevaluestatistics.Itiswellknownthatfailuresofmechanicalcomponents,suchasgearsandbearings,areoftencausedbythepresenceoflargenonmetallicoxideinclusions.Failureofacomponentcanoftenbetracedtothepresenceofalargeinclusion.PredictionsrelatedtocomponentfatiguelifearenotpossiblewiththeevaluationsprovidedbystandardssuchasTestMethodsE45,PracticeE1122,orPracticeE1245.Theuseofextremevaluestatisticshasbeenrelatedtocomponentlifeandinclusionsizedistributionsbyseveraldifferentinvestigators(3-8).Thepurposeofthispracticeistocreateastandardizedmethodofperformingthisanalysis.Thispracticeisnotsuitableforassessingtheexogenousinclusionsinsteelsandothermetalsbecauseoftheunpredictablenatureofthedistributionofexogenousinclusions.Othermethodsinvolvingcompleteinspectionsuchasultrasonicsmustbeusedtolocatetheirpresence.1.1Thispracticedescribesamethodologytostatisticallycharacterizethedistributionofthelargestindigenousnonmetallicinclusionsinsteelspecimensbaseduponquantitativemetallographicmeasurements.Thepracticeisnotsuitableforassessingexogenousinclusions.1.2Baseduponthestatisticalanalysis,thenonmetalliccontentofdifferentlotsofsteelscanbecompared.1.3Thispracticedealsonlywiththerecommendedtestmethodsandnothinginitshouldbeconstruedasdefiningorestablishinglimitsofacceptability.1.4ThemeasuredvaluesarestatedinSIunits.Formeasurementsobtainedfromlightmicroscopy,linearfeatureparametersshallbereportedasmicrometers,andfeatureareasshallbereportedasmicrometers.1.5Themethodologycanbeextendedtoothermaterialsandtoothermicrostructuralfeatures.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H11
【国际标准分类号】:77_040_99
【页数】:11P.;A4
【正文语种】:英语