Ti-V-Nb微合金管线钢水下焊接粗晶区的韧性与沉淀物行为

204199912IRONSTEELVANADIUMTITANIUMVol.20,No.4December1999Ti-V-Nb()X60,X65X70(CGHAZ)Ti-V-Nb,X,Ti(X60,X70)Ti(X65),X65,(TiV),(CGHAZ)BEHAVIOROFCGHAZTOUGHNESSANDPRECIPITATESOFUNDERWATERWELDEDTi-V-NbMICROALLOYEDPIPELINESTEELSShiYonghuaWangGuorong(SouthChinaUniversityofTechnology)AbstractMicrostructure,impacttoughnessandprecipitationbehaviorsofTi-V-Nbparticlesinboththeunderwaterandin-airweldedcoarse-grainedheat-affectedzone(CGHAZ)ofX60,X65andX70microalloyedpipelinesteelswereinvestigated.TheprecipitatecompositionwasalsoexaminedwithEner2gyDisparsiveX-ray(EDX)unit.Theresultsshowedthatgrainsizeofhigh-Tisteels(X60andX70)CGHAZzonewassmallerthanthatoflowTisteels(X65)andimpacttoughnesshigherthanthatofit.Itisrelatedtothestabilityofdifferentmicroalloyingprecipitates(Ti-richandV-rich)inthethermalweldcyclesandtheirdifferentsizedistributionsinparentmaterials.HighercoolingspeedofunderwaterwetweldingresultedinthepresenceofgreaterquantitymartensiteintheCGHAZsothattheirimpacttoughnesswaslowerthanthatofin-airwelding.KeyWordsprecipitate,microalloying,underwaterwelding,coarse-grainedheat-affectedzone(CG2HAZ),toughness1(Ti,V,NbC,N),(CGHAZ),:(970547)©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[3],,80ml700ml120ml(TEM)015mm,X(EDX)GB265089,5mm10mm55mm(X60,X65),10mm10mm55mm(X70),3,3%,,V33111X70Ti-V-NbX60,X65X7061428181313m,32(a)X70;2(b)1X702002199920©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.…LmX6061464158312X652818841212116X7013137618113122X702005,6:;,Ti(X60X70)0142mm,Ti(X65)0154mm;,,0128mm,,X60X7064157618m,X658412m(3);38312,11312,12116m,,312(),3X65,TiC,N,VC,N,NbC,N3X65720004(a)Ti,TiMn,FeNb,Cu4(b)VV,Nb313,56nm,120nm334:Ti-V-Nb©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(a)X6035nm,X65,X7025,35nmTi(X60,X70)Ti-Nb,NbTi75(a),(b),(c)TiV(X60)3611nm,,4416mm(5(a));TiV(X65)TiV(X70),,4080nm;5…dNs,[24,8,9],4199920©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(),TiN,4,7,9,11TiNTiCNTiNb,VTi,VTiV(X65)3144,10kgX60,X65,X70325,342345,210,216247,4(10kg)X60196325210X65205342216X70210345247-15V,X60X655mm10mm55mm,X7010mm10mm55mm,36,,,,,6()6,TiX65TiX60,X70X65V69%4,V,,X60Ti87%4,,,X70,V,Ti,(3),,(6)X60,X70,TiN2,6:X65140J/cm24,(3)54:Ti-V-Nb©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1)TiNb,V,Nb,VTiN/TiCNTi-V-Nb(2)V/,,,(3)Ti-V-Nb(4),TiX60X70X651HoughtonDC,WeatherlyGC,EmburyD.MicrochemistryofCarbonitridesintheHAZofHSLASteels.Proc.Int.Conf.onAdvancesofPhysicalMetallurgyandApplicationsofSteels,1981.131.2StridJ,EasterlingKE.OntheChemistryandStabilityofComplexCarbidesandNitridesinMicroalloyedSteels.ActaMetall,1985,33(11):20572074.3.Ti-V-Nb.,1991,6:344,,1999,9:25315VarugheseR,PenseAW.MicrostructuralDevelopmentintheCoarse-Grained,Heat-AffectedZoneinTitanium-VanadiumMicroalloyedHSLASteels.IMSConvention,Cincinnati,Ohio,USA,1990:3543.6RakI,GlihaVandKocakM.WeldabilityandToughnessAssessmentofTi-MicroalloyedOffshoreSteel.MetallurgicalandMaterialsTransactionsA,1997,28A(1):199206.7WilliamsJG,KillmoreCR,BarettJF,etal.ControlledRollingofHeavyPlatesforOffshorePlatformAp2plica-tions,ProcessingMicrostructureandPropertiesofHSLASteels,ThemetalsSociety,Pittsburgh,1988:133152.8WangGuorong,ShiYonghua.PrecipitateEffectsonToughnessofUnderwaterWeldonPipelineSteels.Proceedingsofthe9thInternationalOffshoreandPolarEngineeringConference(IV),Brest,France,May1999:199206.9SuzukiS,WeatherlyGC.HoughtonDC.TheresponesofCarbo-NitrideParticlesinHSLASteelstoWeldThermalCycles.ActaMetall,1987,35:341352.10HasuiA,SugaY.OnCoolingofUnderwaterWelds.TransactionsoftheJapanWeldingSociety,1980,11(1):2128.11EasterlingKE.IntroductiontothePhysicalMetallurgyofWelding.1sted.,ButterworthsMonographsinMetals,London,1983:104155.(1999-08-09)6199920©1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.