金相组织对双相钢强度影响的研究

(,201900),,,THEINFLUENCEOFMICROSTRUCTUREONTHETENSILEPROPERTYOFDUALPHASESTEELWenDonghui(R&DCenter,BaosteelCo.,Ltd.)AbstractVarioustheoriescommonlyappliedtoDual2phase(DP)steelswerebrieflyreviewed.ThemaineffectswhichinfluencedpropertyofDPsteelwerethecarboncontentinmartensite,thevolumefractionofeachconstituentphaseandtheferritegrainsize.Therefore,anewequationtoevaluatetheDPsteeltensilestrengthwaspresentedwhichcouldevaluatethemechanicalpropertyofDPsteelproperly.KeyWordsDualPhaseSteel,Microsructure,TensileProperty,EvaluationEquationforTensileProperty1,[1],,,,[2],;[35],,,,,2Posco20mm,011%C-115%Mn-0187%Si950(1h),,15mm15mm65mm(1)A3A1950,(825,800,750725),10h276Vol127,No1651200511SHANGHAIMETALSNovember,2005120mm4mmInstron,,510-3s-1-,012%,,4%10g3311,2,(),-,,,2:abcd7257508008252527,,2,,312(3),,,[6],4,3-4,50,4411,,[710],(dp):dp=f(1-Vm)+mVmdp=f+(m-f)Vmdp,f,m,Vmfm,:dp=A+BVm(1)ABDavies[7]Marder[10](1),dpVmDavies:tdp=365+1630Vmydp=103+1111Vm(2)Marder:tdp=480+910Vm(3)ChangandPreban[11]tdpVm,(df)Hall-Petchtdp=0t+Ktdf-1P2and,ydp=0y+Kydf-1P2(4)df,0,KChangPreban0KVmVm0152356:ChenandCheng[12]:tdp=497+2289Vm[(Cd-Cf)PVm+Cf]1P2+111Vm-67Vm2(5)Cd,CfCm(5)55,-,,,:dp=fVf+mVm(6),VfVm,fm,dp,fmdpVm412,[13],,6,6100%,:m=a+k%Cm(7)a0,k6,:|%C|dpf=|%C|mVmm+|%C|f(1-Vm)f^Cm=(Cdp-Cf)PVm+CfCmCfCdp=mfdp=,,,:Cm=CdpPVm(8),,,,(8)(7),4527,(8)413,Hall-Petchf=0+Kfdf-1P2ChangPreban[11]:ft(df)=0t+Ktdf-1P2(9):0t=26213MPa,Kt=28913MPa(um)1P2:fy(df)=0y+Kydf-1P2(10):0y=8813MPa,Kt=57314MPa(um)1P2414,(6)(10),(11)(12):dpt=(1-Vm)(0t+Ktdf-1P2)+Vm(at+ktCdpPVm)(11)dpy=(1-Vm)(0y+Kydf-1P2)+Vm(ay+kyCdpPVm)(12),(11)(12)at,kt,ay,ky:at=48213kt=333313ay=58311ky=32713(11)(12),dpt=(1-Vm)(26213+28913df-1P2)+Vm(48213+3333CdpPVm)(13)dpy=(1-Vm)(8813+57314df-1P2)+Vm(58311+32713CdpPVm)(14)(13)(14):5011C-115Mn-0187Si,,,[1]D.T.Llewellyn,D.J.Hillis.IronmakingandSteelmakeing.1996,23(6):471478[2]S.T.Mileiko.JournalofMaterialsScience.1969,4(11):974977[3]I.Tamura,Y.Tomota,andM.Ozawa.Proc.3rdInt.Conf.ontheStrengthofMetalsandAlloys.Cambridge.1973,1:611615[4]M.F.Ashby.Phil.Mag.1966,14:11571178[5]M.F.Ashby.ed.A.KellyandR.B.NicholsonStrengtheningMethodsinCrystals.1971,137Amsterdam,ElsevierPublishingCo.[6]H.Cimenoglu,E.S.Kayali,ScriptaMetall.Mater.1990,24(12):24372442[7]R.G.Davies.MetallurgicalTransactionA.1978,9A:671679[8]R.G.Davies.MetallurgicalTransactionA.1979,10A:113118[9]T.S.Byun,I.S.Kim.J.ofMater.Sci..1993,28:29232932[10]A.R.Marder.MetallurgicalTransactionA.1982,13A:8592[11]P.H.Chang,A.G.Preban.ActaMetallurgica.1985,33(5):897903[12]H.C.Chen,G.H.Cheng.JournalofMaterialsScience.1986,26(6):1991[13]R.A.Grange,C.R.Hribal,andL.F.Porter.MetallurgicalTransactionA.1977,8A:1775:2005205226556: