低碳钢等径弯曲通道变形数值模拟及组织分析

38320043JOURNALOFXIANJIAOTONGUNIVERSITYVol.383Mar.20041,1,2,1,1(1.,710049,;2.,210094,):,.,.,,,0.408,211,.,,,,.:;;;:TG37613:A:0253-987X(2004)03-0226-04NumericalSimulationofEqualChannelAngularPressingofaLow2CarbonSteelandAnalysisofItsMicrostructureWangLizhong1,AnJing1,WangJingtao2,Guocheng1,ChenJinde1(1.SchoolofMechanicalEngineering,XianJiaotongUniversity,Xian710049,China;2.DepartmentofMaterialsScienceandEngineering,NanjingUniversityofScienceandTechnology,Nanjing210094,China)Abstract:Numericalsimulationandmicrostructureanalysistoanequalchannelangularpressing(ECAP)oflow2carbonsteelwereconducted,andtheeffectivestraindistributionandthepatternofpressingloadwereob2tainedviathenumericalsimulation.Thesimulatedpressingloadincreaseswithincreasingfrictioncoefficient,andwithafrictioncoefficientof01408itis211timesofthatwithoutfriction,whichcoincidesroughlywiththeexperimentalobservation.MicrostructureobservationafteronepassofECAPshowsthatgrainrefinementmightbemoresignificantatthebottomthanatthetopofthesample,andthedistributioncorrespondstotheeffectivestrainfeatures.Keywords:equalchannelangularpressing;lowcarbonsteel;numericalsimulation;microstructure,101000nm,,[1].,.(EqualChannelAn2gularPressing,ECAP).ECAP,,,1.4,4,99%.,,015m.,ECAP,,,.1.ECAP,:2003-08-28.:(1968),,;(),,,.:(59974018).©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.(a)1(b)21ECAP.,,.ECAP,.,ECAP,0,Segal[2,3]€N=2N31/2cot(1):N;=/2;.,Iwahashi[4],€N=N31/22cot2+2+cos2+2(2),Goforth[5],(2)€N=N31/22cot+2+(3),5%.(1)(3)ECAP,,,.€N,.,Superform,ECAP,,.,,,.1Q235A,2500kN,C[6]ECAP(1),15mm15mm60mm.90,10mm,20.(),20119601408.ECAP,JCM-200T(T).ECAP,MSCSuperform.,.,,:=mk,m0()0119601408().4961,40006,,,6.23,-(S-F)2,,.2S-F(1),.m=0(),186kN,m=01408,581kN,395kN.,ECAP,,,,.(2),,.m=0,S-F().ECAP,7223,:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,.,,,,.,,.333,.(),.(a)m=0(b)m=01196(c)m=0140833,m=0,0117811422,201155;m=01196,0128611823,201192;m=01408,0147031314,201355.m,,2.,,ECAP.,,,.,ECAP.4m=01408.,3:1,;3,,,,;2,,,.,2,,,,,.,,ECAP,.4ECAP54(a)(b)5Q235A82238©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved..,Q235AECAP,T,.5a,0139m;5b,0148m,.34,2,().,.5(1),ECAP,,,ECAP.(2),Q235A.,m,.m=01408,211,.(3),Q235A,,,,.,.(4),,.,().:[1]ValievRZ,IslamgalievRK,AlexandrovIV.Bulknanostructuredmaterialsfromsevereplasticdeformation[J].ProgressinMaterialScience,2000,45(2):103189.[2]SegalVM,RereznikovVI,DrobyshevskiyAD,etal.Plasticworkingofmetalsbysimpleshear[J].RussianMetallurgy,1981(1):99115.[3]SegalVM.Materialsprocessingbysimpleshear[J].MaterialsScienceandEngineeringA,1995,l97(2):157164.[4]IwahashiY,WangJ,HoritaZ,etal.Principleofequal2channelangularpressingfortheprocessingofultrafine2grainedmaterials[J].ScriptaMater,1996,35(2):143146.[5]AidaT,MatsukiK,HoritaZ,etal.Estimatingtheequiv2alentstrainintheequalchannelangularpressing[J].ScripMater,2001,44(4):575579.[6]VladimirVS,ZhuYT,AlexandrovIV,etal.Influ2enceofECAProutesonthemicrostructureandpropertiesofpureTi[J].MaterialsScienceandEngineeringA,2001,299(1/2):5967.()2003129,,2002(CSTPCD),,.,.,,,,,().9223,:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.