HG70钢的焊接性分析

HG701,2(1.,400044;2.,430080):HG70,E6015-D1,,,,,,,:;;;:TG406:A:0253-360X(2004)03-117-040,[1],MoBNbV,,,[2,3]HG70700MPa,s500MPa;b:685830MPa;517%;AKV17J,,,,,GB/T3375-94,,,:,();,,,,HG70,,,1HG70,1580GB4675.1-841Table1Chemicalcompositionandmechanicalpropertiesofsteeltested(,%)CSiMnPSMoCrNbVs/MPab/MPa5(%)AKV/J0.060.291.560.0140.0080.330.610.040.045707252669::2003-08-08,2,25320046TRANSACTIONSOFTHECHINAWELDINGINSTITUTIONVol.25No.3June2004©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(mms-1)E/(kJmm-1)200150181110241.61.4E6015-D122.1(JSSC),90%,,,,,,w[4]:w=0.05RF(MPa),RF,RF=700h(MPa),h(mm)w=630MPa,(570MPa),,,,,2.22.2.11,,(),1.5mm1.6mm2.1mm,5.2mm1,(),();,1Fig.1Curveofhardeningcharacteristic2.2.233Table3Testresultsoftensile0.2/MPab/MPa5(%)(%)70154069720.559.770253870121.661.33,,(1),,2.2.3,11825©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1)(22)-40,(2),;-40,(3),2.5mm,;(-40),(4)22-40,,2.33,(4a),(4b),(4b),,(4a)3Fig.3Opticalmetallographofparentmaterial[5],M/A,,,(GrainStruc2ture,GS);,,M/A(GranularBainite,GB),GSGB,GS,M/A4Fig.4TEMmicrostructuresofparentmaterial5,HG70TKS(1100),,,5a;TKSAC3,,,GS,,5b;AC3AC1,,,GS,,5c;,AC1,,,(580),,,5d,,,HG70M/A,,35b,,,,,GBGS,GS[5],,,GB,3,:HG70119©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1)HG70,,HG70(2),,;,,,;,,2.5mm,,,AKV40J;(-40),(3),,HG70()(4),HG70:[1].[J].,1993,23(11):39.[2],,.HG80[J],,1999,34(3):5357.[3],.[M].:,1990.[4]RD,WD.[M].:,1985.[5],.[J].,1990,():8492.:,,1958850Email:[e-mail]12025©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.:liquidfilmsolution-diffusionwelding;Cu-basepow-der;meshsize;microstructuresandproperties.EffectofH2SonsulfidestresscrackingofbasemetalsandweldedjointsofdomesticX70pipelinesteelsTAOYong-yln,DUZe-yu,LIYun-tao,LIJian-ju(SchoolofMaterialsScienceandEngineering,TianjinUni2versity,Tianjin300072,China).p105-108Abstract:Slowstrainratetestwasadoptedtostudythesulfidestresscracking(SSC)resistanceofdomesticX70steelsandweldedjoints,andtheinfluenceofH2ScontentandweldingtechniqueonSSCwasdiscussed.TheresultsrevealthatwithincreasingofH2S,theSSCresistancedecrease,andatthesamecondition,theSSCresistanceforweldedjointsarelowerthanthatofbasemetal.TheeffectofH2SonSSCofdomesticX70pipelinesteelsandweldedjoisntsisveryimportant.Keywords:domesticX70pipelinesteels;weldedjoint;H2S,sul-fidestresscrackingEffectsofheatinputonmechanicalandcorrosionpropertiesofdu-plexstainlesssteeltubularweldedjointJINXiao-junI,HUOLi-xingI,ZHANGYu-feng1,BAIBing-ren2,LIXiao-wei2,CAOJun2(1.SchoolofMaterialScienceandTechnology,TianjinUniversity,Tian2jin300072,China;2.ChinaOffshoreOilEngineeringLtd.,Tianjin300452,China).p109112Abstract:Duplexstainlesssteelpipeswereall-positionweldedbydif2ferentweldingprocedure.Microstruetures,mechanicalandcorro-sionprop2ertiesoftheweldedjointswereinvestigatedonconditionofdif-ferentheatinputs.Thetestresultsshowheatinputisanimportantfactorwhichhaseffectonphaseratio.Itwillleadtomoretransformationofaus-tenitewithhigherheatinput.Meanwhile,phaseratioalsohasinfluenceonthemechanicalprop2ertiessuchastension,impacttoughnessoftheweldedjoints.Thecorrosionsurfacemorphologyandcrystallographiccharacteristicsofcrevicecorrosionpitwereinvestigatedbyscanningelec-tronmicroscope(SEM).SEMobserva2tionrevealsthatferriteiscorrodedpreferentiallyandtubularausteniteisun2covered.Theoccurrenceofcorro-sionisduetothedisparityintheelectro2chemicalpotentialsofferriteandanstenite.Keywords:duplexstainlesssteel;heatinput;mechanicalprop-erty;weldedjointlnterfacialbehavioroffilledjointsbyelectrosparkoverlayingZHANGFu-ju1,HUAAi-bingI,XUKai,MALi-qingI(1.WuhanUni-versi2ty,Wuhan430072,China;2.HarbinWeldingInstitute,Harbin,150080,China).p113116Abstract:Theinterfacialbehavioroffilledjointsbyeleetrosparko-ver2layingwithfillerwire,lowpulsepowerandlowenergyinputisre-searched,itisprovedbymicroscopy,EPMAanalysisthattheinterfaeiajoinoverlayedbyeleetrosparkismetallurgyconnection.Atleastthenon-uniformlymixedmutualmeltingcrystallization,thethinlayermeltingin-terdiffusioncrystal2lizationandthemicrediffusionunconspieuoussecondarysolidificationcrystal2lizationareconcluded.Keywords:electrospark;overlaying;interfacialjoinWeldabilityofHGTOsteelSHENGGuang-minI,GAOChang-vi2(1.ChongqingUniversity,Chongqing400044,China;2.WuhanIronandSteelCo.,Wuhan430080,China).p117120Abstract:TheweldabilityofHG70steel,includingthejointandusageproperties,isinvestigated.Undertheconditionofrestraintweld-ing,thecoldcrackrateiszerg,showinganexcellentjointproperty.Theexperimentalresultsofte