ASTM B311-2008 孔隙度小于2％的粉末冶金材料密度的标准试验方法
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【英文标准名称】:StandardTestMethodforDensityofPowderMetallurgy(PM)MaterialsContainingLessThanTwoPercentPorosity
【原文标准名称】:孔隙度小于2％的粉末冶金材料密度的标准试验方法
【标准号】:ASTMB311-2008
【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】:B09.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:cementedcarbides;density;hardmetals;metalinjectionmolded(MIM)parts;powdermetallurgy(P/M);powderforged(P/F)parts;powdermetallurgy
【摘要】:ForPMmaterialscontaininglessthantwopercentporosity,adensitymeasurementmaybeusedtodetermineiftheparthasbeendensified,eitheroverallorinacriticalregion,tothedegreerequiredfortheintendedapplication.Densityalonecannotbeusedforevaluatingthedegreeofdensificationbecausechemicalcompositionandheattreatmentaffectthepore-freedensity.Forcementedcarbides,adensitymeasurementisnormallyusedtodetermineifthereisanysignificantdeviationincompositionofthecarbidegrade.Forstraighttungstencarbide-cobaltgrades,therelationshipisstraightforward.Forcomplexcarbidegrades(forexample,gradescontainingtantalumcarbideortitaniumcarbide,orboth,inadditiontotungstencarbide-cobalt),thesituationismorecomplicated.Ifthemeasureddensityisbeyondthespecifiedlimits,thecompositionisoutsideofthespecifiedlimits.Ameasureddensitywithinthespecifiedlimitsdoesnotensurecorrectcomposition;compensationbetweentwoormoreconstituentscouldresultintheexpecteddensitywiththewrongcomposition.Densityalonecannotbeusedforevaluatingacementedcarbidegrade.1.1Thistestmethodcoversthedeterminationofdensityforpowdermetallurgy(PM)materialscontaininglessthantwopercentporosityandforcementedcarbides.Thistestmethodisbasedonthewaterdisplacementmethod.Note18212;Atestspecimenthatgainsmasswhenimmersedinwaterindicatesthespecimencontainssurface-connectedporosity.Unsealedsurfaceporositywillabsorbwaterandcausedensityvalueshigherthanthetruevalue.Thistestmethodisnotapplicableifthisproblemoccurs.1.2Withtheexceptionofdensityvalues,forwhichtheg/cm3unitistheindustrystandard,thevaluesstatedinSIunitsaretoberegardedasthestandard.Valuesininch-poundunitsareshowninparenthesesandresultfromconversioninaccordancewithIEEE/ASTMStandardSI10.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H16
【国际标准分类号】:77_160
【页数】:4P.;A4
【正文语种】:英语
【原文标准名称】:孔隙度小于2％的粉末冶金材料密度的标准试验方法
【标准号】:ASTMB311-2008
【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】:B09.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:cementedcarbides;density;hardmetals;metalinjectionmolded(MIM)parts;powdermetallurgy(P/M);powderforged(P/F)parts;powdermetallurgy
【摘要】:ForPMmaterialscontaininglessthantwopercentporosity,adensitymeasurementmaybeusedtodetermineiftheparthasbeendensified,eitheroverallorinacriticalregion,tothedegreerequiredfortheintendedapplication.Densityalonecannotbeusedforevaluatingthedegreeofdensificationbecausechemicalcompositionandheattreatmentaffectthepore-freedensity.Forcementedcarbides,adensitymeasurementisnormallyusedtodetermineifthereisanysignificantdeviationincompositionofthecarbidegrade.Forstraighttungstencarbide-cobaltgrades,therelationshipisstraightforward.Forcomplexcarbidegrades(forexample,gradescontainingtantalumcarbideortitaniumcarbide,orboth,inadditiontotungstencarbide-cobalt),thesituationismorecomplicated.Ifthemeasureddensityisbeyondthespecifiedlimits,thecompositionisoutsideofthespecifiedlimits.Ameasureddensitywithinthespecifiedlimitsdoesnotensurecorrectcomposition;compensationbetweentwoormoreconstituentscouldresultintheexpecteddensitywiththewrongcomposition.Densityalonecannotbeusedforevaluatingacementedcarbidegrade.1.1Thistestmethodcoversthedeterminationofdensityforpowdermetallurgy(PM)materialscontaininglessthantwopercentporosityandforcementedcarbides.Thistestmethodisbasedonthewaterdisplacementmethod.Note18212;Atestspecimenthatgainsmasswhenimmersedinwaterindicatesthespecimencontainssurface-connectedporosity.Unsealedsurfaceporositywillabsorbwaterandcausedensityvalueshigherthanthetruevalue.Thistestmethodisnotapplicableifthisproblemoccurs.1.2Withtheexceptionofdensityvalues,forwhichtheg/cm3unitistheindustrystandard,thevaluesstatedinSIunitsaretoberegardedasthestandard.Valuesininch-poundunitsareshowninparenthesesandresultfromconversioninaccordancewithIEEE/ASTMStandardSI10.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H16
【国际标准分类号】:77_160
【页数】:4P.;A4
【正文语种】:英语
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