【英文标准名称】:StandardTestMethodforNonmetallicInclusionContentofPowdersIntendedforPowderForging(PF)Applications
【原文标准名称】:粉末锻造(PF)用非金属杂质含量的测定用标准试验方法
【标准号】:ASTMB796-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:低合金钢;金相学;冶金;非金属夹杂物;测试
【英文主题词】:nonmetallicinclusions;powderforged(PF)steelparts
【摘要】:Theextensiveporositypresentinpressedandsinteredferrousmaterialsmaskstheeffectofinclusionsonmechanicalproperties.Incontrast,thepropertiesofmaterialpowderforgedtonearfulldensityarestronglyinfluencedbythecomposition,size,sizedistribution,andlocationofnonmetallicinclusions.Thetestfornonmetallicinclusionsinpowderforgedsteelsisusefulasthefollowing:Characteristictoclassifyordifferentiateonegradeofpowderfromanother.Meansofqualitycomparisonofpowdersintendedforpowderforging,lottolot.Significantvariationsinnonmetallicinclusioncontentwilloccurif:Thepowderusedtoformthetestspecimendoesnotmeetpowderforgingqualitystandardsfornonmetallicinclusioncontent.Processingofthepowderforgedtestspecimenhasbeencarriedoutunderconditionsthatdonotpermitoxidereductionorallowoxidationofthetestspecimen,orboth.1.1Thistestmethodcoversametallographicmethodfordeterminingthenonmetallicinclusionlevelofpowdersintendedforpowderforging(PF)applications.1.2Thetestmethodcoversrepresspowderforgedtestspecimensinwhichtherehasbeenminimallateralmaterialflow(1%).Thecoreregionofthepowderforgedtestspecimenshallcontainnoporositydetectableat100.1.3Thistestmethodisnotsuitablefordeterminingthenonmetallicinclusionlevelofpowderforgedtestspecimensthathavebeenforgedsuchthatthecoreregioncontainsporosity.Atthemagnificationusedforthistestmethodresidualporosityishardtodistinguishfromoxideinclusions.Toomuchresidualporositymakesameaningfulassessmentoftheinclusionpopulationimpossible.1.4Thetestmethodmaybeappliedtomaterialsthatcontainmanganesesulfide(admixedorprealloyed)providedthenearneighborseparationdistanceischangedfrom30mto15m.Note1Thetestmethodmaybeappliedtopowderforgedpartswheretherehasbeenagreateramountofmaterialflowprovided:Thenearneighborseparationdistanceischanged,orTheinclusionsizesagreedbetweenthepartiesareadjustedfortheamountofmaterialflow.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H70
【国际标准分类号】:77_040_99
【页数】:3P.;A4
【正文语种】: