400MPa级超细晶粒钢的焊接(4)

2001,Vol.22,No.6　　　TRANSACTIONSOFTHECHINAWELDINGINSTITUTION　3

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TRANSACTIONSOFTHECHINAWELDINGINSTITUTION(TCWI)wasstartedin1980.Thisperiodical(Bimonthly)issponsoredbyChineseMechanicalEngi2neeringSociety.Itistobedistributedbothathomeandabroad.Itmainlyreportstherecentscientificandtechnologicalachievementsonwelding.Manyofthembe2longtothefrontierinthefieldsoflearning.ItbasicallyreflectsChinaweldinglevelandpossessestheacademicauthorityinChinaweldingfield.ThisperiodicalwasaffirmedthefirstbatchcoreperiodicalofChinascience.Ithasalargenumberofsubcribersathomeandhasmadeaninternationalreputation.

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MAINTOPICS,ABSTRACTS&KEYWORDS

Weldingof400MPaUltra2fineGrainSteels　　TIANZhi2ling(CentralIron&SteelResearchInstitute,Beijing100081,China),HEChang2hong,ZHANGXiao2mu,ZOUGang,QUZhao2xia.p1～3

Abstract:ThegraingrowthandmicrostructuretransformationintheHeat2affectedZone(HAZ)ofa400MPaultra2finegrainsteelwereRemarkablegraingrowthoccurred.Thegraingrowthistoweldingheatinput.Hardnessspec2imensandcrossweldoccurredintheHAZ.Allthecrossweldrupturedinthebasemetal.Themi2crostructureofthecoarse2grainedzoneismainlycomposedofbainiteandsideplateferrite.Charpy2Vimpactingtestonsub2sizespecimens,however,showedthatthenotchimpactvaluesoftheHAZareequivalenttothatofthebasemetal.Thisneedstobefurtherstudied.

Keywords:ultra2finegrainsteel;HAZ;graingrowth;microstructure

joint

guo,HUOLi2xing,ZHANGYu2feng.p7～10

Abstract:Itisrequiredthattheshouldhaveenoughdynam2icunderdynamicloading.Mtheicisexpensiveanddifficult,soitthefracturebehavioratdynamicloadingformaterialandaccessedusingstaticfracturetoughnessresult.Inthispaper,thefracturetoughnessforweldedjointwasmeasuredatdifferentloadingrates,andthefracturebehavioratdynamicloadingwaspredictedsuccessfullyfromstaticfracturetoughnessresultbasedonthelocalapproach.Thetempera2tureimprovinginthematerialitselfisconsideredduringthepredictionanaly2sis.Itisprovedthatthelocalapproachiseffectivetoanalysisthefracturebe2havioratdynamicloading.

Keywords:loadingrate;fracturetoughness;localapproach;welded

PropertiesofJointofSiCP/LD2AluminumMetalMatrixCompositesUsingContinuousWaveLaser　　ZHANGDe2ku(NationalKeyLaboratoryofAdvancedWeldingProductionTechnologyofHarbinInstituteofTechnolo2gy,Harbin150001,China),CHENYan2bin,NIUJi2tai,KONGLing2chao.p4

ImprovementofNi3AlWeldingPropertywithAdditionofWC　　SUOJin2ping(DepartmentofMaterialsSience&Engineering,HuazhongUniversityofScience&Tecnology,Wuhan430074,China),FENDDi,QIANXiao2liang,CUIKun.p11～14

Abstract:Ni3Alisacandidatematerialsforhightemperaturestructure

～6

Abstract:Inthispaper,continuouswaveCO2laserwasusedtojoinSiCP/LD2aluminummatrixcompositesandthefactorsdegradingtheproper2tiesofthejointwereanalyzed.Theresultsshowedthatforthiscomposites,thefactorsinfluencingonpropertiesofthejointarevarious,forexample,formationofthebrittlealuminumcarbide,porosityandincompletefusionforhighviscos2ityofmoltenpool,theexistenceofalveolategasporesandaluminumoxidefilm.Ofallthefactors,themostprimacyfactoraswellasthemostdifficulttoeliminateisformationofaluminumcarbide.Themeasuresofavoidingdefectsandimprovingthepropertiesofjointwereproposed.

Keywords:SiCP/LD2composites;laserbeamwelding;propertiesofjoint

materialsandwearresistantmaterials,butitsweldabilityisn’tgoodbecauseitcontainshighcontentAl.EffectofWCcontentinweldingrodsontheweldingpropertyofNi3Alwasinvestigatdinthispaper.TheweldingsurfaceofNi3AlcrackedbecausealotofAlwasoxidized.Whentherodscontained5%2wtWC,partialAlwasoxidized,andWCtransformedintoW2C,thematrixtrans2formedintoNi3(AlTi)Casaresultthatoxide2embraced2carbide/nickelalu2minidecompositesformed.WithWCcontentintherodsupto30%2wt,noAlwasoxidized,andcrack2freeweldingsurfacewasobtained.

Keywords:WCaddition;improvingweldingproperty;compositeweld2ingrod;intermetalliccompound

InfluenceofThermalCyclesontheCoatingCorrosionResistanceof

PredictionofFractureBehavioratDynamicLoadingforWeldedJoints

SprayedPorcelainPipe　　WANGYong(UniversityofPetroleum,Shan2dong257061,China),HANTao,ZHANGWen2yue.p15～17

　　JINGHong2yang(TianjinUniversity,Tianjin300072,China),LIUXiu2