ASTM A923-2008 测定双联奥氏体/铁素体不锈钢不稳定金属间相的标准试验方法

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【英文标准名称】:StandardTestMethodsforDetectingDetrimentalIntermetallicPhaseinDuplexAustenitic/FerriticStainlessSteels
【原文标准名称】:测定双联奥氏体/铁素体不锈钢不稳定金属间相的标准试验方法
【标准号】:ASTMA923-2008
【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】:A01.14
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:成双的;双工
【英文主题词】:duplex;intermetallic;stainlesssteels;Austeniticstainlesssteel;Charpyimpacttest;Detrimentalintermetallicphasedetection;Duplexstainlesssteel;Etchstructures;Ferricchloridecorrosiontest;Ferriticstainlesssteel;Intermetallicphasedet
【摘要】:1.1Thepurposeofthesetestmethodsistoallowdetectionofthepresenceofintermetallicphasesinduplexstainlesssteelstotheextentthattoughnessorcorrosionresistanceisaffectedsignificantly.Thesetestmethodswillnotnecessarilydetectlossesoftoughnessorcorrosionresistanceattributabletoothercauses.1.2Duplex(austenitic-ferritic)stainlesssteelsaresusceptibletotheformationofintermetalliccompoundsduringexposuresinthetemperaturerangefromapproximately600to1750x00B0;F(320to955x00B0;C).Thespeedoftheseprecipitationreactionsisafunctionofcompositionandthermalorthermomechanicalhistoryofeachindividualpiece.Thepresenceofthesephasesisdetrimentaltotoughnessandcorrosionresistance.1.3Correctheattreatmentofduplexstainlesssteelscaneliminatethesedetrimentalphases.Rapidcoolingoftheproductprovidesthemaximumresistancetoformationofdetrimentalphasesbysubsequentthermalexposures.1.4Compliancewiththechemicalandmechanicalrequirementsfortheapplicableproductspecificationdoesnotnecessarilyindicatetheabsenceofdetrimentalphasesintheproduct.1.5Thesetestmethodsincludethefollowing:1.5.1TestMethodA8212;SodiumHydroxideEtchTestforClassificationofEtchStructuresofDuplexStainlessSteels(Sections3-7).1.5.2TestMethodB8212;CharpyImpactTestforClassificationofStructuresofDuplexStainlessSteels(Sections8-13).1.5.3TestMethodC8212;FerricChlorideCorrosionTestforClassificationofStructuresofDuplexStainlessSteels(Sections14-20).1.6Thepresenceofdetrimentalintermetallicphasesisreadilydetectedinallthreetests,providedthatasampleofappropriatelocationandorientationisselected.Becausetheoccurrenceofintermetallicphasesisafunctionoftemperatureandcoolingrate,itisessentialthatthetestsbeappliedtotheregionofthematerialexperiencingtheconditionsmostlikelytopromotetheformationofanintermetallicphase.Inthecaseofcommonheattreatment,thisregionwillbethatwhichcooledmostslowly.Exceptforrapidlycooledmaterial,itmaybenecessarytosamplefromalocationdeterminedtobethemostslowlycooledforthematerialpiecetobecharacterized.1.7Thetestsdonotdeterminetheprecisenatureofthedetrimentalphasebutratherthepresenceorabsenceofanintermetallicphasetotheextentthatitisdetrimentaltothetoughnessandcorrosionresistanceofthematerial.1.8Examplesofthecorrelationofthermalexposures,theoccurrenceofintermetallicphases,andthedegradationoftoughnessandcorrosionresistancearegiveninAppendixX1andAppendixX2.1.9Thevaluesstatedineitherinch-poundorSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.10Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.3.1Thesodiumhydroxideetchtestmaybeusedfortheacceptanceofmaterialbutnotforrejection.Thistestmethodmaybeusedwithotherevaluationteststoprovidearapidmethodforidentifyingthosespecimensthatarefreeofdetrimentalintermetallicphasesasmeasuredintheseothertests.