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46520115IronandSteelVol.46,No.5May2011李文韬,李正操,张寒,白秉哲(,100084):,,(PBR),TEMPBRPBR,,,,,PSB1080,20mm1600~1610MPa,1400~1420MPa,8.5%,5.0%;32mm1450~1500MPa,1140~1200MPa,9.0%,5.0%:;;;(Ti,V)C:A:0449749X(2011)05007605DevelopmentofAirCooledSuperStrengthFinishRolledRebarLIWentao,LIZhengcao,ZHANGHan,BAIBingzhe(DepartmentofMaterialScienceandEngineering,TsinghuaUniversity,Beijing100084,China)Abstract:Superstrengthfinishrolledrebarbasedonaircooledwasstudiedinlaboratoryandindustrialproductionwascarriedout.Vanadiummicroalloyedwasdevelopedonthebaseofmanganeseseriesbainiticsteelsinordertoimproveperformance,reducecostsandsimplifytechnology.Besides,morphology,sizeanddistributionofvanadiumprecipitateswerestudiedbyuseofTEM.Theaircooledbainitesteeldevelopedwithoutexpensivealloyelementsshowshighstrengthandlowyieldratio,whichfullymeetsthestandardofPSB1080.20mmrebarhasmechanicalpropertiesasfollows:Rm16001610MPa;ReL14001420MPa;A8.5%;Agt5.0%.32mmrebar:Rm14501500MPa;ReL11401200MPa;A9.0%;Agt5.0%.Keywords:manganeseseriesbainiticsteel;superstrengthfinishrolledrebar;vanadiummicroalloying;(Ti,V)C:(2004CB619105,2010CB731600):(1985),,;Email:liwt04@mails.tsinghua.edu.cn;:201006112070,,,,,1000MPa40Si2MnV40Si2MnMoV45Si2CrB,,,,[13],,1成分设计,[3],,/,,,,,600,,,,,5:,,0.9%,,,,0.02%,(0.10%),GB/T200652006,,(PBR)2成分组织和力学性能2.1PBR[45]11,PBRPRB,20~32mm:!!!!,,300,50cm60t1()Table1Chemicalcompositionofsuperstrengthfinishrolledrebar%CSiMnCrBPSTiMoVNi40Si2MnMoV()0.4701.770.9200.0260.0240.1800.20040Si2MnV()0.4601.740.8960.0260.0180.12545Si2CrB()0.4681.730.6750.460.0020.0170.0140.00370.0570.0020.021AJL1080()0.4801.700.9500.400.0120.0050.1900.17070SiMnCr()0.7200.491.2700.130.0150.015PBR0.3100.940.100.0290.0060.02900.029PBR40Si2MnMoV40Si2MnV45Si2CrB11,PBRPBR45Si2CrB60,100,200MPaPBR300,2[45]1PBR4Fig.1Hardness(HV)distributionoffinishrolledrebarusingPRB1andotherfourclassicalmaterials12,PBR32mm,20mm1400MPa,1600MPa2,AJL1080,PBR,,40Si2MnV()[5],TemperCore(),,,.,,,100~300MPaReL850MPaReL850MPa,ReL930MPa,Z8%AJL1080,,1,PBRAJL1080∀77∀462PBR300Table2MechanicalpropertiesoffinishrolledrebarusingPBRtemperedat300/mmRm/MPaReL/MPaA/%Agt/%201600~16101400~14208.55.00.87~0.88PBR251510~15201223~12308.54.00.80~0.81321450~15001140~12009.05.00.76~0.8340Si2MnMoV()321100900140.8245Si2CrB()25~321155~11601040~105012.3~13.50.90~0.9140Si2MnV()32995~1080760~8258~12#0.7670SiMnCr()-1270113010.00.89AJL1080(1))321280119011.60.931)AJL108045Si2MnMoV,,40Si2MnMoV40Si2MnV45Si2CrB,PBR,;1080/1230MPa,2.2232mmPBR,(a);(b)232mmFig.2Microstructureofthecoreandsurfaceof32mmrebar20mm32mmPBR3434,PBR,/,B/M+IF()(a)20mm;(b)32mm3Fig.3Microstructureofthecoreofrebarwithdifferentdiameters∀78∀5:(a)M/A;(b)M/A;(c);(d)PBR4PBRM/AFig.4M/Aisland,martensiteandproeutectoidferriteinPBR2.3(Ti,V)C3[6]:1),;2),22nm;3),/(∃15nm)lgw([V])∀w([C])=672-9500/T,PBR,812[7]:VTi,2,(Ti,V)(C,N),,1100PBR1050,(Ti,V)(C,N),,VC,2[6]:(Ti,V)(C,N),,;,5TEM:,,6,PBR,30nmEDS:(Ti,V)C;,8nm6(d),18nm40nm2%&,21.5nm,30nm15nmPBR5Fig.5Classicalmorphologyofprecipitates∀79∀46(a);(b);(c)EDS;(d)6(Ti,V)CFig.6Sizeanddistributionof(Ti,V)C3结论1),(PBR),1450~1500MPa,1140~1200MPa,90%,5.0%40Si2MnV40Si2MnMoV45Si2CrB,PBR,,,1200MPa,2)PBR(Ti,V)C,,(∋40nm),;215nm,30nm15nm:[1],,,.[J].,1998(7):11.[2],,,.Mn[J].,2008(23):3.[3],,,.[M].:,1999.[4]WangTing,MaPusheng,ZhangWanshan,etal.StudyonProductionProgress,MicrostructureandPropertiesof1080/1230MPaGradeFinishRerolledRebar[C]//SecondInternationalConferenceonAdvancedStructuralSteels.Shanghai:2004.[5],,,.[J].:,2003,24(3):268.[6]BakerTN.Processes,MicrostructureandPropertiesofVanadiumMicroalloyedSteels[J].MaterialsScienceandTechnology,2009,25(9):1083.[7],,,.NbVTiVTi[J].,2007,43(7):753.∀80∀