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42320073IronandSteelVol.42,No.3March2007Nb,,,,(,110004):Gleeble22000/NbX46,NbMnNb,:X46981.31,Nb:;;;Nb:TG142:A:04492749X(2007)0320037204ResearchofDeformationResistanceModelingforNbBearingSteelDuringCompactStripProcessZHANGXiao2fang,ZHOUXiao2guang,LIUZhen2yu,WANGGuo2dong,WUDi(TheStateKeyLabofRollingTechnologyandAutomation,NortheasternUniversity,Shenyang110004,Liaoning,China)Abstract:SinglepassreductiontestofX46steelproducedbycompactstriprollinglineatBenxiSteelwasperformedbyGleeble22000thermal/mechanicalsimulationtester.ConsideringtheeffectofMnandNbcontent,deformationresistancemodelingwasstudied.ProductiondataandsinglepassreductiontestresultsshowthatandtemperatureofrecrystallizationforX46steelis981.3;Dynamicrecrystallizationfractioniscloseto1duringroughrolling;Cal2culateddeformationresistancesareingoodagreementwithexperimentalresultsbyconsideringtheeffectofdynamicrecrystallizationandaccumulativestrain,showingthatthedevelopedmodelcanpredictdeformationresistanceoflowcarbonNbbearingsteelincompactstripprocess.Keywords:compactstripprocess;deformationresistance;dynamicrecrystallization;Nbbearingsteel:(5033401050474086):(19602),,,;E2mail:xiaoguangzhou@126.com;:2006209211,,,,Nb,Nb,Nb[1](25),NbX46,,11.1X46185mm,1743mm21Table1Chemicalcompositionofindustryexperimentalsteel%w(C)w(Si)w(Mn)w(P)w(S)w(Als)w(Nb)0.050.151.20.00530.0060.0250.02422Table2DatatakenfromtherollmilllogsR1R2F1F2F3F4F5/1086.71074.6996.7981.3963.7946.7929.2/(ms-1)0.561.041.752.633.64.575.36/s-12.66.213.321.830.442.732.6/mm47.2926.3516.3911.258.456.846.27/kN2945028626309302535422319157099252/mm9469437747737735965973Table3Chemicalcompositionofexperimentalsteel%w(C)w(Si)w(Mn)w(P)w(S)w(Als)w(Nb)10.0490.1201.1400.00390.00190.0280.01420.0480.1671.0860.00570.00100.0230.02530.0550.2041.2080.00420.00140.0590.03640.0530.1551.1780.00400.00120.0420.0501.238mm15mmGleeble22000,:100/s1250,30s,10/s1150,2min,5/s,10s,70%(1.204),21,22OROWANSIMS1Fig.1Schematicofsingle2passcompressiontest,SIMS:P=BlcQPK(1),B,lc;QP,K;PlcQP[2](1)22,4,4,X46Tnr981.333422X46Fig.2Changeofdeformationresistancewithpasstem2peratureofX46gradesteels833:Nb(a)3;(b)432Fig.3Stress2straincurvesofNo.3andNo.4steels3,,0.6,,,R1R2,,,,Nb142,NbNbMnMisaka=aexp(b+c[Nb]+d[Mn]T)0.210.13(2),[Nb],[Mn]NbMna13.17,b2704,c3345,d22044(a)F3F5,,,,,,(3)[3](3)3,,,,,,3,(4)modify=(1-Xdyn)+1.147.2exp(QdefRT)0.09(3),(2);Xdyn;Qdef;R;Ta=n+(1-X)n-1(4),an;nn;Xn-1;n-1n-14(b)4,,,3(1),X46981.3(2)4Nb9342(a);(b)4X46Fig.4DeformationresistanceondifferentstandsforX46gradesteel:,,1,(3)MnNb,X46,:[1],.CSP[J].,2005,22(1),30231.[2].[M].:.2002.[3]SicilianoJrF,MinamiK,MaccagnoTM,etal.MathematicalModelingoftheMeanFlowStress,FractionalSofteningandGrainSizeDuringtheHotStripRollingofC2MnSteels[J].ISIJInt.,1996,36(12):150021506.04