Stress corrosion cracking of carbon steel weldments.pdf

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1、STRESSCORROSIONCRACKINGOFCARBONSTEELWELDMENTSPoh-SangLamHighLevelLiquidWasteTankIntegrityWorkshopSavannahRiverSite,Aiken,SouthCarolinaMay13-15,2008Co-authors°UniversityofSouthCarolina:Mr.ChangminChengProfessorYuhJ.Chao°SRNL:RobertL.SindelarTinaM.StefekJamesB.Elder,IIIReference:PVP2005-71327,

2、ProceedingsofASMEPressureVesselsandPipingConference,Denver,Colorado,2005.ModelingEffortsProfessorBillY.J.ChaoMr.ChangminCheng(MSThesis)DepartmentofMechanicalEngineeringUniversityofSouthCarolina–ColumbiaSupportedbyU.S.NationalScienceFoundationAcknowledgements°DOEOfficeofScienceEnvironmentalMa

3、nagementScienceProgram(EMSP)°SRTC/HLWStrategicR&D°SRNLSupportAndyDuncan(MaterialPreparation)DonFisher(EquipmentDesign)GlennMckinney(Welding)KevinKalbaughandAngelaBowser(LabSupport)Outline°StressCorrosionCracking(SCC)TestAsubcriticalextensionofcracksdrivenbyenvironmentaleffects–Weldingoftests

4、pecimens–Testequipment–SCCtests–Cracksizing:Radiography,MT,andUT°WeldingSimulation–GasMetalArcWelding(GMAW)–Six-pass,threepereachsideindouble-vee–Clampedplates°WeldingResidualStressDetermination°CrackGrowthModelingandPrediction°ConclusionsandFutureDirectionStressCorrosionCrackingTestOverview

5、°MaterialofconstructionforSRSHLWTypesIandIItankswasselected(A285carbonsteel);water-jetcutinto12”x6”pieces.°HLWtankweldingprocedurewasused(GMAW)toformtwo12”x12”specimenplates.Clampingwasusedwhileweldingtosimulatejoiningoflargeplatesinthefield.°Oneoftheplateswasstressrelieved,perSRSHLWtankstan

6、dardtreatment;theotherplatewasas-welded.°SampleplatesweresenttovendorforEDMofseedcracks(eachplatehasthreethroughplatecracksandsixpart-throughcracks).°UTandradiographyexaminationswereperformedforestablishinginitialbaseline.°PlateswerecleanedwithClarke’ssolutionbeforesubmergedinto5MNaNO3soluti

7、onat90-95°C.°Periodicallyexaminationforcrackgrowth.°PlateswereremovedfromtesttankafterfiveweeksforMT.°Re-submergedforadditional6weeksandperformedfinalMTandUT.WeldingofSpecimenPlatesSeedCrackFabricationandCharacterizationV5P1P3V1V2V3P2P4V4FullPenetr