ASTM E1180-2008 宏观结构检验用硫印准备的标准实施规范

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【英文标准名称】:StandardPracticeforPreparingSulfurPrintsforMacrostructuralEvaluation
【原文标准名称】:宏观结构检验用硫印准备的标准实施规范
【标准号】:ASTME1180-2008
【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】:E04.01
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:Baumannprint;ferrousalloys;macrostructuralevaluation;photographicpaper;specimenpreparation;sulfurprint;Baumannprints;Castiron(testing);Deoxidation;Failureendpoint--metals/alloys;Ferrousmetals/alloys;Killedsteelsulfurdistribution;
【摘要】:Thesulfurprintrevealsthedistributionofsulfurassulfideinclusionsinthespecimen.Thesulfurprintcomplementsmacroetchmethodsbyprovidinganadditionalprocedureforevaluatingthehomogeneityofasteelproduct.Sulfurprintsofas-castspecimensgenerallyrevealthesolidificationpatternandmaybeusedtoassessthenatureofdeoxidation,thatis,rimmingactionversuskilledsteelsulfurdistributions.Sulfurprintswillrevealsegregationpatterns,includingrefilledcracks,andmayrevealcertainphysicalirregularities,forexample,porosityorcracking.Thenatureofmetalflow,suchasinvariousforgingoperations,canberevealedusingsulfurprintsofspecimenscutparalleltothemetalflowdirection.Thesulfurprintmethodissuitableforprocesscontrol,researchanddevelopmentstudies,failureanalysis,andformaterialacceptancepurposes.Theintensityofthesulfurprintisinfluencedbytheconcentrationofsulfurinthesteel,thechemicalcompositionofthesulfideinclusions,theaggressivenessoftheaqueousacidsolution,andthedurationofthecontactprintingbetweentheacidsoakedemulsioncoatedpaperandthegroundsurfaceofthespecimen(thistimeistheorderofsecondsratherthanminutes).Verylowsulfurcontentsteelswillproducetoofaintanimagetobeusefulformacrostructuralevaluations.Selectionofappropriateprintingpracticesincludingselectionoftypeofemulsioncoatedmedia,acidtypeandstrength,willyieldsatisfactoryprints.VeryfaintimagesinthesulfurprintcanbemademorevisiblebyscanningthesulfurprintintoaPC,andusingaphotoeditortoincreasethecolorsaturation.Steelswithcompositionsthatproducepredominantlytitaniumorchromiumsulfideswillnotproduceusefulimages.1.1Thispracticeprovidesinformationrequiredtopreparesulfurprints(alsoreferredtoasBaumannPrints)ofmostferrousalloystorevealthedistributionofsulfideinclusions.1.2Thesulfurprintrevealsthedistributionofsulfidesinsteelswithbulksulfurcontentsbetweenabout0.010and0.40weightpercent.1.3Certainsteelscontaincomplexsulfidesthatdonotrespondtothetestsolutions,forexample,steelscontainingtitaniumsulfidesorchromiumsulfides.1.4Thesulfurprinttestisaqualitativetest.Thedensityoftheprintimageshouldnotbeusedtoassessthesulfurcontentofasteel.Undercarefullycontrolledconditions,itispossibletocompareprintimageintensitiesiftheimagesareformedonlybymanganesesulfides.1.5Thesulfurprintimagewillrevealdetailsofthesolidificationpatternormetalflowfromhotorcoldworkingonappropriatelychosenandpreparedtestspecimens.1.6Thispracticedoesnotaddressacceptancecriteriabasedontheuseofthemethod.1.7ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,seeSection9.
【中国标准分类号】:G04
【国际标准分类号】:
【页数】:4P.;A4
【正文语种】:英语