V和V-N微合金化低碳钢

2005-03-30-1971-1961-27220062JournalofNortheasternUniversityNaturalScienceVol.27No.2=============================================================Feb.20061005-3026200602-0181-04VV-N110004VV-N860~740࠷VNVVVVVV-NVV-NTG335A2080DIFTDeformationInducedFerriteTransformation1Ar32DIFT3~55DIFT6VVDIFTV7NbTiV89VVV-N0.1%C~1.0%Mn860~740࠷10.1%C~1.0%MnVN11Table1ChemicalcompoSitionofexperimentalSteelS%CMnSiVNSPOAlV0.1240.9510.2550.0510.00840.00390.00700.00220.015V-N0.1101.1200.4090.0510.01990.00340.00800.00390.0361200࠷!8mm*15mmGleeble-1500120࠷s1100࠷2min5࠷s860࠷620%10s-110s2࠷s1Fig.1SchematicofdeformationprccedureinthermalSimulation0.3mmTEMPhilipsEM400100kV22.1231~6V-NVV-N1860࠷V2840࠷V-N3820࠷V4800࠷6760࠷V-N70%V50%VN26Fig.2MicroStructureofVandV-NSteelSatdifferentphaSeSduring6-paSSdeformationaV2bV4cV6dV-N2eV-N4fV-N63VV-N6Fig.3Changeofferriteolumefractioninthet?oSteelSduring6-paSSdeformation2.24V-N50nm4a4bV4c281277VV-NNVVVV-NV4TEMFig.4TEMimageSofprecipitateSinSideauSteniteaV-N2bV-N3cV22.32820࠷V-N5aV780࠷5b760࠷V5cV-NV5TEMFig.5TEMimageSofprecipitateSinSideferriteaV-N5bV5cV631VN2VNVV3V-NV1MatsumuraYYadaH.Evolutionofultrafine-grainedferriteinhotsuccessivedeformationJ.TransISIJ1987276492-498.2HicksonMRHurleyPJGibbsRKetal.Theproductionofultrafineferriteinlow-carbonsteelbystrain-inducedtransformationJ.MetalMaterTransA20023341019-1026.3Q235J2001376601-608YangPFuYYCuiFEetal.InfluenceofdeformingtemperaturesonthestraininducedtransformationinQ235plaincarbonsteelJ.ActaMetallSinica2001376601-608.4BeladiHKellyGLShokouhiAetal.Theevolutionofultrafineferriteformationthroughdynamicstrain-inducedtransformationJ.MaterSciEngA20043711-2343-352.3812VV-N5M2003.109-115DongHSunXJLiuQYetal.Ultrafinegrainsteels-theoryandcontrollingtechnologyofmicrostructurerefinementofsteelsM.BeijingMetallurgicalIndustryPress2003.109-115.6J1996261-6QianZS.ControlledrollingandcontrolledcoolingproductionofsinglestandmediumandheavyplatemillJ.WideandHeavyPlate1996261-6.7VJ200544291-294WangLJWuTWangKetal.EvolutionofmicrostructuresinV-microalloyedlowcarbonsteelduringmulti-passdeformationJ.JMaterMetal200544291-294.8StanislawZ.Precipitationandgrainrefinementinvanadium-containingsteelsA.InternationalSymposium2001onVanadiumApplicationTechnologyC.Beijing2001.62-82.9M2000.27-31DongCRRenHPJinTZetal.Microalloyednon-quenchedandtemperedsteelsM.BeijingMetallurgicalIndustryPress2000.27-31.PrecipitationBehaviorandEffectsofVanadiumCarbonitrideinVandV-NMicroalloyedMildSteelDuringMulti-PassDeformationWANGLi-junWANGKaiRENHai-pengLIUChun-mingSchoolofMaterials&MetallurgyNortheasternUniversityShenyang1100[e-mail]ureevolutionandprecipitationbehaviorofvanadiumcarbonitridewereexaminedusingaGleeble1500thermalsimulatoraswellastheirmutualeffectinVandV-Nmicroalloyedmildsteel0.1%C~1.0%Mnduringmulti-passdeformationat860~740࠷.TheresultshowedthataddingasmallamountofNtoVmicroalloyedsteelwillexpeditetheprecipitationofVCNespeciallyV-NindeformedausteniteandthedeformationinducedferritetransformationDIFT.ButtheconcentrationofVdissolvedinaustenitedecreasesbecauseoftheprecipitationofVCNthusweakeningtheeffectofVonsuppressingDIFTsoastoexpeditetheferritenucleation.MoreovertheprecipitationofVCNcauseslocallytheformationofcarbon-poorregioninaustenitethusexpeditingtheferritenucleationfurther.ComparingwiththeVmicroalloyedsteelunderthesametreatmentconditionstheprecipitationofVCNwithinferritesinV-NmicroalloyedsteelrequiresshorterinoculationtimewithhigherVCNvolumefractionlowergrowthrateandwiderdispersion.KeywordsVmicroalloyedsteelV-NmicroalloyedsteelcarbonitrideDIFTdeformationinducedferritetransformationReceivedMarch302005==================================================================XRRRunge-Kutta48127