钢预应变马氏体相变的软模形核机制研究

21320009TRANSACTIONSOFMETALHEATTREATMENTVol.21No.3September2000,,,(,710048):1999212215;:2000203208:(1975),,,:Fe2C,,35SiMnCrMoV:;;,35SiMnCrMoV,135SiMnCrMoV,(w,%):C01270132,Si114117,Mn017110,Cr110113,Mo0140155,V01080115,Ni0125,S0101,P01013Geeble21500,12mm60mm1200;1000900800,40%,Û=(1%112%)s-1;30s110030s012mm,,TEMTEM200CX3,,;XTEM21©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.135SiMnCrMoV400Fig.1Microstructureof35SiMnCrMoVsteelwithdeformationquenching400a)1000deformation,b)900deformation,c)800deformation,d)1100nodeformation,35SiMnCrMoV12001100,;1000,,;900800,,XTEM,121(B)(AR)Table1Theresultsofmartensitelathsize(B)andresidualaustenitecontent(AR)/B/mAR(%)A1000014358B90001241012C80001318101100016953,900800,,,,,,800,800,900133:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.235SiMnCrMoVTEM29000Fig.2TEMofmartensitemorphologyof35SiMnCrMoVsteelunderprestrainquenching29000a)1100nodeformation,b)1000deformation,c)900deformation,d)900deformation,e)800deformation,f)800deformation3.1[1](SoftModePhonon),,,:,;;()Born[2]Milstein[3],Clapp[1],StrainSpinodal(),(ChemicalSpinodal),Clapp[1]2321©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,,,,XY[4]X(106),YX,,,,()Y+Y-,d-d,23,(),Y,,,,33Fig.3Martensitenucleationprocess,a)XfieldandYdipoleoccurrence,b)Y+andY-approachingandmartensiteoccurrence,c)transitionfieldcondensingapairofsharpinterface3.2Fe2C,Cu2ZnAu2CdFe2CFe2Ni,,Olson2Cohen[5],35SiMnCrMoV,,,XXY,333:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,XY,X,,YFe2C,,Yd=a/18[133][4],a/18(133)YFe2C,Y,a/2110a/6001+a/6331a/6331Y3,Ya/6331Y,,,,,Y,,;,,Y,a/6001,Y,,a/6001a/3001,Ya/3001,,a/6211a/6211,,,,,,,,35SiMnCrMoVABC(1),A;C,B,B,,41),,,,35SiMnCrMoV40%,100090080030s100030s,90080030s,,900,,,2),4321©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1ClappPC.Alocalizedsoftmodetheoryformartensitictransformations.PhysicaStatusSolodi(b),1973,57:561569.2BornM.Onthestabilityofcrystallattices.ProcCambridgePhilSoc,1940,36:160172.3MilsteinF.Theoreticalstrengthofaperfectcrystal.PhysRev,1971,B3:11301141.4..:,1993:3465.5OlsmGB,CohenM.Ageneralmechanismofmartensiticnucleation.MetallTrans,1976,7A:18971923.StudyonMechanismofMartensiteTransformationSoftModeNucleationunderPrestraininSteelWeiJingsong,GuChenqing,LuZhengxin,GeLiling(Dept.ofMaterials,XianUniversityofTechnology,ShanxiXian710048)Abstract:TheapplicationofmartensitetransformationsoftmodenucleationtheorydevelopedinrecentyearstotheFe2Calloysystemisinvestigated,andthedislocationreactionmechanisminmartensitetransformationsoftmodenucleationtheoryisalsodeepdeveloped.Theexperimentalresultsshowthattheadvancedmartensitetransformationsoftmodenucleationtheorycanbetterexplainthemartensiterefininglawof35SiMnCrMoVsteelthantraditionalmartensitetransformationnucleationtheories.Keywords:strain;softmodenucleationtheory;martensitetransformation533:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.