【英文标准名称】:StandardTestMethodforElectrochemicalReactivation(EPR)forDetectingSensitizationofAISIType304and304LStainlessSteels
【原文标准名称】:检测AISI304和304L型不锈钢增感作用的电化学再活化性(EPR)的标准试验方法
【标准号】:ASTMG108-1994(2010)
【标准状态】:现行
【国别】:美国
【发布日期】:1994
【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】:G01.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:carbideprecipitation;electrochemicalreactivation(EPR)test;electrochemicaltest;intergranularcorrosion;sensitization;stresscorrosioncracking;Sensitization;Stainlesssteel(corrosiontesting);Stresscorrosioncracking(SCC);Carbidepreci
【摘要】:ThistestmethoddescribesanEPRtestmethodforquantitativelydeterminingtherelativedegreeofsensitizationinAISIType304and304Lstainlesssteels.TheEPRtesthasfoundwideuseasameanstoprovideanumericallevelofsensitizationinstudiesoftheeffectsofsensitizationonintergranularcorrosionandintergranularstresscorrosioncrackingbehavior.Theresultsofthistestmethodcorrelatewithothertestmethods(forexample,PracticesA262andTestMethodsG28)thatarecommonlyusedtoassesssensitizationinstainlesssteels.TheEPRtestcanalsobeusedforproductacceptance,serviceevaluation,regulatorystatutes,andmanufacturingcontrolsprovidingthatboththesupplieranduserhaveagreeduponappropriateacceptancecriteriaandasensitizingtreatment.Thetestisnotintendedfordesignpurposessincethetestconditionsacceleratecorrosioninamannerthatdoesnotsimulateanyactualserviceenvironment.TheEPRtestinvolvesthemeasurementoftheamountofchargeresultingfromthecorrosionofthechromium-depletedregionssurroundingtheprecipitatedchromiumcarbideparticles.Mostoftheseparticlesinasensitizedmicrostructurearelocatedatthegrainboundaries.However,discreteparticleslocatedwithingrains(referredtoasintragranularprecipitates)willalsocontributetothetotalmeasuredcharge.(SeeFig.2.)Therefore,itisimportanttoexaminethealloymicrostructurefollowinganEPRtesttodeterminetherelativeproportionofcorrosionsitesassociatedwithintergranularversusintragranularprecipitates.SitesofintergranularattackwillappearsimilartograinboundaryditchingasdefinedinPracticeAofPracticesA262.Note8212;ThecalculationofPaisbasedontheassumptionsillustratedatleft.Mildcasesofsensitizationusuallyresultinacombinationofintergranularattackandpittingasillustratedatright(7).FIG.2SchematicMicrostructuresAfterEPRTesting1.1Thistestmethodcoversalaboratoryprocedureforconductinganelectrochemicalreactivation(EPR)testonAISIType304and304L(UNSNo.S30400andS30403,respectively)stainlesssteels.Thistestmethodcanprovideanondestructivemeansofquantifyingthedegreeofsensitizationinthesesteels(1,2,3).Thistestmethodhasfoundwideacceptanceinstudiesoftheeffectsofsensitizationonintergranularcorrosionandintergranularstresscorrosioncrackingbehavior(seeTerminologyG15).TheEPRtechniquehasbeensuccessfullyusedtoevaluateotherstainlesssteelsandnickelbasealloys(4),butthetestconditionsandevaluationcriteriausedweremodifiedineachcasefromthosecitedinthistestmethod.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H25
【国际标准分类号】:77_140_20
【页数】:9P.;A4
【正文语种】:英语