细晶粒低碳钢的轧制工艺对显微组织的影响

18920069JournalofIronandSteelResearchVol.18,No.9September2006:(2001AA332020):(19652),,,;E2mail:[e-mail];:2005205211,,,,(,110004):,,,,,,:;;;;:TG14214:A:100120963(2006)0920032204EffectofRollingParametersonMicrostructureofLowCarbonUltra2FineGrainedSteelGAOCai2ru,LIUHui,DULin2xiu,LIUXiang2hua,WANGGuo2dong(StateKeyLaboratoryofRollingTechnologyandAutomation,NortheasternUniversity,Shenyang110004,Liaoning,China)Abstract:Thekeytechniqueofhotrollinglowcarbonultra2finegrainedsteelstripconsistsincontrolledrollingandcontrolledcooling.Althoughsomeeffectsofrollingparameterssuchasrollingtemperature,rollingschedule,coolingrateetconmicrostructurehavebeenstudied,therearealsootherfactors,suchasenergyconsumption,cost,stripshapeandmillcapacityshouldbeconsidered.Asaresult,therollingparametersshouldbeoptimizedfurther.Rollingparametersofultra2finegrainedstripweresimulatedbythermomechanicalsimulationandsimula2tedresultswereinreasonableagreementwithmeasuredinpractice.Microstructureofsampleswasobservedandconclusionsweredrawn.Allofthesearehelpfulfordeterminingrollingparametersonline.Keywords:ultra2finegrainedsteel;thermomechanicalsimulation;hotrolling;technicalcondition;microstructure,,[14],,,,1C2MnANS400,35mm,(,%)C01121,Si01131,Mn1130,P01012,S01005,N010021,Als01001300mm600mm100mm12mm,8mm15mm3,,11455,131111()20/s1000,3min,5/s980,980950920890860,01101101201401655,1s-1,5/s,6s1/s10/s20/s31122()15,01655014012011011,11133()1,100980930880830760,1Gleeble1500,LEICADMIRM1Fig11Schematicofthermo2mechanicalexperiment221121,3(1/s10/s20/s),,[5,6],;,2,1/s10/s,1212m415m,10/s20/s,012m,,3,,,,,,,,,,,,,,,[7],,,(a)1/s;(b)10/s;(c)20/s2(1)Fig12Effectofcoolingrateonmicrostructure339:212322,,1,,2,,:1/s10/s20/s,,,,,,[8]9809509208908601s-1,900[9]11105,2012,,213(b)(c),10/s,,,,,,[5,6],,,,,,2134331(a)1/s;(b)10/s;(c)20/s3(2)Fig13Microstructureofsamplescooledatdifferentrate(a)1/s;(b)10/s;(c)20/s4(3)Fig14Microstructureofsamplescooledfrom760atdifferentrate4318,1,3850760,1/s,1212m312m;10/s,312m311m;20/s,,,3(980930880830760),1,3,,,4,760,1/s,10/s20/s,Ar3,830,Ar3[1012](5),32(830)[13][9],5/s,Ar3760770760,,,(01655),Z,,,[1416]35Ar3Fig15RelationshipbetweenAr3anddeformationtemperature,1/s,,10/s20/s1/s,,,,,3,3(1),(10/s),;10/s,(2),,,(3),,Ar3,1/s:[1],.CSP[J].,2002,14(1):42246.[2],.[J].,2001,13(1):36239.[3],.[J].,2000,12(5):36239.[4],.[J].,2000,12(6):29232.[5].[M].,,.:,2002.[6],.[M].,,,.:,1996.[7],,.[M].:,1989.[8].[D].:,2001.[9].[D].:,2001.[10],,.[J].,2002,38(2):1962202.[11]DULinxiu,ZHANGCaibei,DINGHua.DeterminationofUpperLimitTemperatureofStrain2InducedTransformationofLowCarbonSteels[J].(55)539:4(1)K423A850105013808501440,(2),,(1500)(950),(3)1050,14401500950,1440,:[1].K423A[R].1992.[2].[M].2.:,2002.[3],.K423A[J].,2003,15(7):1922195.[4].[M].:,1978.(35)ISIJInternational,2002,42(10):111921124.[12],,,.[J].,2002,38(10):103121036.[13]JongKyoChoi,Dongg2HanSeo,Jae2SangLee,etal.Forma2tionofUltrafineFerritebyStrain2InducedDynamicTransfor2mationinPlainLowCarbonSteel[J],ISIJInternational,2003,43(5):7462754.[14],,.[A]..2001[C].:,2001.8572859.[15],,.[A]..[C].:,2001.2712274.[16]SUNZQ,YANGWY,QIJJ,etal.DeformationEnhancedTransformationandDynamicRecrystallizationofFerriteinaLowCarbonSteelDuringMultipassHotDeformation[A]..[C].:,2001.1202123.559:K423A