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:1004-9762(2003)03-0227-05X,(,014010):;;;:TG142:A:,,.,,.,,.,,.,.EutectoiddecompositionofpearliteinsteelsLIUZong2chang,SONGYi2quan(MaterialScienceandEngineeringSchool,USTInnerMongolia,Baotou014010,China)Keywords:pearlite;prevenientphase;eutectoiddecomposition;interphaseprecipitationAbstract:Itisgenerallyconsideredthatthesimplemechanicalmixtureofferriteandcementiteisgainedinthepearlitetransformationandthereisprevenientphaseinthisprocess.Thescientifictheoryandmethodareappliedtostudythepearliticeutectoiddecompositionmechanisminsteelsandtheconceptofexistenceofso2calledprevenientphasewasnegated.Itisthoughtthatthepearlitetransformationandinterphasepre2cipitationofsupercoolingausteniteisaprocessthatferriteandcarbiedcancoexistandbecomeaeutectoidinthedecomposeprocess.Thetrans2formationmodelisdesignedforthetheory.Experimentsshowthatpearliticnucleuscanformontheausteniticgrainboundary,andthereistheorientationrelationshipbetweenferriteandcementitealso.Itisindicatedthatpearliteandinterphaseprecipitationinsteelaretwokindsofinte2gratedstructureofeutectoidferriteandcarbide.,20,20..42CrMo,U74,42Mn2V,,,.142CrMo,U74,42Mn2V,.,,.JEM-200CX.1.1(,%)Table1ChemicalcompositionofteststeelCSiMnSPCrMoV42CrMo0.410.200.410.0020.0220.110.19U740.740.190.770.0260.02142MnV0.420.210.510.0040.0300.2520039223JournalofBaotouUniversityofIronandSteelTechnologySeptember,2003Vol.22,No.3X:2002-06-23:(1940-),,,,.©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,.2,,,:(1).(2),.(3).(4),;,.,,,.[1].,.,,1.2.11,[2],,Ar1,:AP(F+Fe3C).(P),(F+Fe3C),1,1.,+,,,..Fe2C,,13%.,,.1,.2.21.,,,,,.,.,,w(C)=0.85%8,.,[3].,50/s230/s,40,w(C)=1.4%1.7%[1],.,,,.,,,(),,,,,1.,(F+Fe3C);+.1(a),(b).,,(),[4,5],.,,,,.,..,(+).,600700,Fe2C1100m/s[6].,,,1,1(b).,1(e)42MnV1,3m.,,,2.1,2,.2(a),,(F+Fe3C),,,2.2.3,.1(e),.(U74),3.:82220039223©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.1Fig.1Thesketchmapofpearliticnucleation2growth(a);(b)P(F+Fe3C);(c),(d);(e)TEM2Fig.2Nucleatingandgrowingsketchmapwithcementiteasprevenientphase3TEM,Fig.3TEM,micrographyforpearlitetonucleateongrainboundary(A)Z(+)P(F+Fe3C).1,,1;2,,2[6].1(b),(c),,Fe3C,.,,,;,,.,,1(c),(d),(e),1.1(e)42MnV,,1.,.,,,,,.,[7].3,,.[6],,Pitsch2PetchBagay2atski.JEM200CX,(U74),,.,4.Bagayatski:1#:(011)(Fe3C)(011);2#:(100)(Fe3C)(011).Pitsch2Petch:4#:(021)(Fe3C)(130);5#:(110)(Fe3C)(211);6#:(112)(Fe3C)(211).922:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.4,B(100)(Fe3C)(011)Fig.4Aelectronicdiffractionspectrum,Bagayatskiralation(100)(Fe3C)(011),,,.,,,.42060,,Nb,V.,.750850,10nm;600700,5nm[8].,.4.1(),,,.[9],VC(V4C3),.5VC.,,,.,,.4.2,,2,:,5VCTEMFig.5TEMmicrographofVCinterphaseprecipitationA1,,,,/,,/,.,/,[10,11]..[3],1,+(VC,NbC),,(F+MC),.+,,+,P(F+MC)P(F+Fe3C)2,P(F+MC)P(F+Fe3C).,AP(F+MC).03220039223©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,V,Nb,V,Nb,.V,Nb,,,,,..,,,,.5.(1),F+Fe3C,,.(2),,.(3),BagayatskiPitsch2Petch.:[1].[M].:,1987.49260.[2].[J].,2002,14(5):35241.[3].[M].:,1987.46280.[4].[M].:,2001.542163.[5],.[M].:,1996.552156.[6],.[M].:,1997.502100.[7].[M].:,1981.30245.[8],,.[M].:,2000.17219.[9].45MnVRE[J].,1988,(6):39244.[10].[M].:,1998.3202350.1,,,,11,1,1,,;,11,14,,12003-08-05(3)132:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.