热机械控制工艺对热轧TRIP钢力学性能的影响

42220072IronandSteelVol.42,No.2February2007TRIP1,2,2(1.,110034;2.,110004):(TMCP)TRIP:,,,(TRIP)70050%,791MPa,538MPa36%:TRIP;;;:TG333.7:A:04492749X(2007)0220039205EffectofThermoMechanicalControlledProcessingontheMechanicalPropertiesofHotRolledTRIPSteelLIZhuang1,2,WUDi1(1.DepartmentofMaterialandEngineering,ShenyangInstituteofAeronauticalEngineering,Shenyang110034,Liaoning,China;2.StateKeyLabofRollingandAutomation,NortheasternUniversity,Shenyang110004,Liaoning,China)Abstract:Theeffectsofthermomechanicalcontrolledprocessing(TMCP)onthemechanicalpropertiesofhotrolledtransformationinducedplasticity(TRIP)steelwereinvestigatedbyusingalaboratoryhotrollingmill.Theresultsshowedthatdeformationinducedferritetransformationoccurrsduringhotdeformation.Severedeformationatlowtemperatureresultsinferritegrainrefining.Thestabilityoftheretainedausteniteisincreasedwithdecreasingfin2ishingrollingtemperatureandincreasingfinishingrollingreductionrate,causingsatisfactoryTRIPeffect.Tensilestrength,yieldstrengthreachtheirmaximumvalues(791MPa,538MPaand36%,respectively)whilethetotalisreducedby50%onfinishingrollingattemperatureof700.Keywords:hotrolledTRIPsteel;reductionrateoffinishingrolling;finishingrollingtemperature;mechanicalproperties:(19642),,,;E2mail:[e-mail];:2006204201(TRIP)[1]TRIPTRIP[2,3],400,[3],TRIPTRIP,,,TRIP(TMCP),TRIP,TMCPTRIP11.1130kg,:w(C)=01233%w(Si)=11365%w(Mn)=11540%w(P)=01007%w(S)=01004%w(Al)=01080%80mm120mm800mm15mm,8mmGleeble1500,tnrAr3Ar1:tnr=910,Ar3=780,Ar1=640421.21.2.1,450mm20mm,17mm20mm650mm,180mm1,12,34(+)(1)7007508003,10/s660,40020min,1.2.2,50mm15mm5mm/min4%D/max2rAX(XRD,CuK)22.1TRIP1Fig.1Scheduleoflaboratoryrolling1Table1Hotrollingparameters//mm/%(R1)(R2)(R3)197011.045454529306.640404038108604.04040404700,750,8002.02.8304050,TRIP22,TM2CPTRIP(1),,3,,700750800,,,,TRIP,80030%,,769MPa523MPa28%700750,,80070050%,791MPa538MPa36%2.2TRIP50%,2Fig.2Relationshipsofmechanicalpropertiesandfin2ishingrollingtemperature042:TRIP700,75080033,700750800,4.4m5.1m5.3m,,,,,,700R1R2R3,44,,,30%(R1)5.5m50%(R3)4.4m(,)TMCP,5700(R3)5,(),(),M/A(),,,M/A(a)700;(b)750;(c)8003Fig.3Microstructuresofspecimensfinishedatdifferenttemperatures(a)30%;(b)40%;(c)50%4Fig.4Microstructuresofspecimensfinishedwithdifferentreductionrates(a);(b)5Fig.5SEMmicrographsofthespecimenbeforeandaftertensiletest1442(a);(b);(c)6(R3)Fig.6TEMmicrographsofspecimenR3beforetensiletestTRIP,M/A,670050%,,0.5m700(R1,R2R3)X,22,,33.1TMCP4(1,1)(34),Ae3,(DIFT),TMCP,,,,[4],,,800700,30%50%,(3(a),4(c)),,,,TRIP2Table2Retainedaustenitevolumefractionbeforeandaftertensiletest%R11810R22113R32215,(2)3.2,,,[5],,(6),,,,700750,,[6],,,,(+),,,(35),,,Si,,Si,,TRIP(35,2)TRIP,(),,,M/A(35),TMCP,,,TRIP242:TRIP[7]:3,TRIP,,,(5,2),(2),(2)TMCP,,,,,,TRIP(2)70050%,,791MPa,538MPa36%4(1)TRIPTMCP,(2),,TRIP(3)TRIP,,TRIP,70050%,791MPa538MPa36%:[1]BandyopadhyayNR,DattaS.EffectofManganesePartitioningonTransformationInducedPlasticityCharacteristicsinMicro2alloyedDualPhaseSteels[J].ISIJInt.,2004,44:9272934.[2]TimokhinaIB,HodgsonPD,PerelomaEV,etal.EffectofDeformationScheduleontheMicrostructureandMechanicalPropertiesofaThermomechanicallyProcessedC2Mn2SiTrans2formation2lnducedPlasticitySteel[J].MetallurgicalandMate2rialsTransactionsA,2003,34A:159921609.[3]PerelomaEV,TimokhinaIB,HodgsonPD,etal.Transfor2mationBehaviourinThermomechanicallyProcessedC2Mn2SiTRIPSteelswithandwithoutNb[J].MaterialsScienceandEngineering,1999,273:4482452.[4]WengYQ,SunXJ,DongH,etal.OverviewontheTheoryofDeformationInducedFerriteTransformation[J].IronandSteel,2005,40(Supply):9215.[5]LuoH,ZhaoL,KruijverSO,etal.EffectofIntercriticalDe2formationonBainiteFormationinA12containingTRIPSteel[J].ISIJ.Int.,2003,43(8):121921227.[6]BasukiA,AernoudtE.InfluenceofRollingofTRIPSteelintheIntercriticalRegionontheStabilityofRetainedAustenite[J].Journal.Materials.ProcessingTechnology,1999,89290:37243.[7]GodetS,HarletP,DelannayF,etal.EffectofHot2rollingCon2ditionsontheTensilePropertiesofMultiphaseSteelsExhibi2tingaTRIPEffect[J].SteelResearch,2002,73(6+7):2802286.200720072007139,11,7,7,7,4,2()34