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21220006TRANSACTIONSOFMETALHEATTREATMENTVol.21No.2June2000(,710072):2000201210;:2000204212:(1920),,,,,,,4,30015:;CCTTT,,(),,:;;;30Bain,5060Aaronson,,[13],1,(Bu)(Bl)[4](BCF)[5][6]BIBIIBIII[7]:BCFBIBIIBu,BIIIBl;[810]Gs(1a),(M2A),,;(1b),(M2A)(BF),BuSi(meta2bainite)(Bm)[1012],BF(AR1AR2)(2a),AR1BF,AR2BF,,(2b);(2c),(BCBC1BC2BC3)AR1(Bu),AR2(Bl)BF(Bl)BCCu1[13]BmBF,,1©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.115CrMnMoV(a)(b)[10]Fig.1Granularstructure(a)andgranularbainite(b)in15CrMnMoVsteel240CrMnSiMoV920,320a)20min,,b)2.5min,BF,c)120min,Fig.240CrMnSiMoVsteelaustenitizedat920andtreatedat320for20min,darkfieldofaustenite(a);for2.5min,darkfieldofBF(b);andfor120min,brightfield(c)22.13a)[10],:,,,,,,[14]TEMCuZn,Trivedl[15]2.2TTTTTT[1013](3b),GsBuBl,CGs,TTTTTTC,(bay),Cu,C[13]33.1[1621],32:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.315CrMnMoV970(a)TTT(b)Fig.3Growthkinetics(a)andmiddletemperatureTTTdiagram(b)in15CrMnMoVsteelaustenitizedat9704,(4a),BF(4b)Cu[13]Fe2Ni[22]48Mn8SiMo125035058h,SAM(a)(OM)BF(b)Fig.4CarbondistributionneargrainboundaryofaustenitemeasuredwithSAM(a)andnucleationsitemeasuredwithOM(b)in8Mn8SiMosteelaustenitizedat1250andtreatedwith35058h3.2()TEM(5a)[2325],()(110)b(111)f,Wayman[26](252)5a),8Mn8SiMo,1250,Ms-60,35060hTEM,TEM(350),BF(5b),BBB,10minB1B1B1,,,Cu[13]Fe[27,28]Cu[29]/,[30],(),[12]421©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.58Mn8SiMo125035058h(60h+10mim),BF(a)BF(b)Fig.5Morphologyofbainiticnucleus(a)andBFwidening(b)in8Mn8SiMosteelaustenitizedat1250andtreatedwith350for58hand(60h+10min)(2b),()[12],47Si3,920315,TEMBF1,,17Si3BF[3132]Table1ExperimentalandtheoreticaldataofcrystallographyofBFin7Si3steel0.3709650.6899120.6216160.3674730.6992230.6132300.2450.420(111)f(011)b0.5(111)f(011)b0.28[101]f[111]b3.5[101]f[111]b4.085Fe2C,,(BF),[3336]:+1+1BF+1(1)1(x0)(xd)(x1);BFBF(xd)BF(xd)GBF=-G+1+G(2)52:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.Fe2C2M,BuBlBs2,,2BsTable2Bstemperature,resistanceanddrivingforceofbainitictransformationbyshearinsteelsBuBlBs//Jmol-1/Jmol-1Bs//Jmol-1/Jmol-115SiMn3Mo450621-6203401260-125040CrMnSiMoV420747-7503101382-13509SiCr4001026-11002601860-182061)BuBl(Bm),BmBFCu1,2)C,CTTT,3)BF,4),5)(),6),Cu1HehemannAF,KinsmanKR,AaronsonHI.Thedebateonthebainitereaction.MetallTransA,1972,(3):1077.2Symposiumoninternationalconferenceonbainite,PartI,MetallTransA.1990,21A(4):767889.PartII,1990,21A(6):13431547.3Procecedingsofthepacificrimconferenceontherolesofshearanddiffusionintheformationofplate-shapedtransformation;products,PartI,PartII,MetallMatersTransA,1994,25A(9)and25A(12):1781and2549.4MehlRT.Hardenabilityofalloysteels.ASM,Cleveland,OH,1939,1:54.5...,1954,.:,1955:81.6HabrakenL.Proc.4thint.congr.ontheelectro2microscopy,Berlin,SpringerVerlog,1958,1:621.7.Someproblemsonbainitetransformationandpropertiesofbainite.,1979,65(1):126.8,..:.,,1987:92.621©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.9,,..(),1983,19(4):2.10KangMK,ChenDM,YangSP,HuGL.Thetime2temperature2transformationdiagraminsomealloysteels.MetallTransA,1992,25A:785.11..,1988,2(3):12.12,,..,1996,32(9):897.13MengXK,KangMK,YangYQ,etal.TheformationmechanismofplatebetaCu-ZnandCu-Zn-A1alloys.MetallMatersTransA,1994,25A:2601.14EntwisleAR.Formationkineticsofmartensiteinsteels.MetallTransA,1971,2A:2395.15YangYQ,LiuDH,MengXK,KangMK.GrowthkineticsandhightemperatureTEMinsituobservationofbainiteinaCu-Znalloy.MetallMatersTransA,1994,25A:2609.16KangMK,YangYQ,WeiQM,etal.Ontheprebainitephenomenoninsomealloys.MetallMatersTransA,1994,25A:1941.17,.Cu-Zn-A1.,1993,29(3):A359.18,,,.Fe-C.,1994,15(3):12.19WuXL,ZhangXY,KangMK.Formationofcarbon-poorregionsduringpre-bainitictransformation.MaterialsLetters,1995,22:141.20,,..,1988,2(3):32.21FengH,KangMK.Montecarlosimulationoflamellarproductsofmiddletemperaturerange.ICOMAT-92,Montery,California,1992:779.22ShenR,ChenJQ,KangMK.Pre-bainitictransformationinFe-Nialloy.JIronandSteelRes.Int,1998,5(2):47.23,,,.TEM.,1997,33(7):697.24,,.TEM.,1997,18(2):14.25,,..,1998,19(1):1.26SandvikBJP,WaymanCM.Thesubstructureof(252)fmartensiteformedinFe-8Cr-1Calloy.MetallTransA,1983,14:2455.27,,.9CrSi/.,1993,14(2):190.28,,.TEM.,1997,11(1):13.29YangYQ,KangMK,HanD,etal.Comparativestudyofseveralinterphaseboundariesinbrass.PRCM-1,ShiCX,LiHD,AScott,eds;TMSPress,1993,469.30,,..(E),1998,28(6):481.31,..,1991,27(3):A23232SunJL,KangMK.Substructureandcrytallographicfeatureoflowerbainite.ICOMAT-92,Montery,California,EditedbyWaymanCM,PerkinsJ,1992:809.33WuXL,ZhangXY,KangMK,etal.Displacemechanismofbainiticformationincarbon-depletedregionsofaustenite.MetallTransJim,1994,55(11):782.34,,.Fe-C-M.,1994,15(3):735.35WuXL,MengXK,ZhangXY,etal.Thermodynamicsofbainiteformationincarbon-depletedregionsinFe-Calloy.JMatersSciTechnol,1994,10(4):441.36,,.Fe-C.,1995,31(3):A115.72:©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.ThePrincipalReviewonResearchofBainiticTransformationTheoryKangMokuang(NorthwesternPolytechnicalUniversity,Xian710072)Abstract:Bainitecanbeclassifiedi