冷镦钢ML40Cr盘条热变形阻力的实验研究

264ML40Cr111112,331.1100042.1100043.411101Gleeble-3800ML40Cr,ML40CrML40Cr,TG335.6AStudyofDeformationResistanceofML40CrColdHeadingSteelGAOXiu-hua1,PANGBo1,QIUChun-lin1,QIKe-min1,TIANYan-wen2,YUANLi-zhong3,WUShui-long3,QINYe-jun3(1.TheStateKeyLaboratoryofRollingandAutomation,NortheasternUniversity,Shenyang110004,China2.SchoolofMaterialsandMetallurgyNortheasternUniversity,Shenyang110004,China3.HunanHalingXiangtanIron&steelCo.,Ltd,Xiangtan411101,China)Abstract:Themetal-plasticdeformationresistanceofML40CrsteelhadbeenstudiedbyisothermalcompressiontestintheGleeble-3800thermal-mechanicalsimulator.Themathematicalmodelofthedeformationresistanceisestablishedbyanalyzingtherelationshipofthedeformationtemperature,deformationrate,deformationdegreeanddeformationresistance.Additionally,thedeformationresistanceexpressionwasregressedusingoriginsoft.ItisabletooffertheoreticbasetocalculaterollingforceofML40Crsteel.Keywords:coldheadingsteel;thermal-mechanicalsimulate;deformationresistance1[1-2][3-4]ML40CrML40CrML40Cr211015mm,Gleeble-3800ML40Cr20/s11503min20/s70011505030s1:20050385921966265500.5s-12s-110s-130s-11(%)Table1ThechemicalcompositionsofML40Cr(mass,%)CSiMnPSNiCrCuAsAlML40Cr0.40.220.710.0220.0080.0150.9990.0310.0080.0233.11700800[5]-70080070080090010001100120050100150200250300350400450500=0.3strainrate0.5/sstrainrate2/sstrainrate10/sstrainrate30/sDeformationresistance,MPaTemperature,70080090010001100120050100150200250300350400450500strainrate0.5/sstrainrate2/sstrainrate10/sstrainrate30/sDeformationresistance,MPaTemperature,=0.51Fig.1Relationshipofdeformationresistanceanddeformationtemperatureunderdifferentdeformationrates3.22ML40Cr2660.5/s10000.5/s100030/s0.00.10.20.30.40.50.60.70501001502002503000.5s-11150110010501000950900850800MPa7007500.00.10.20.30.40.50.60501001502002503001100100011501050950900850MPa7007502s-10.00.10.20.30.40.50.605010015020025030035040010s-11150110010501000950900850750800MPa7000.00.10.20.30.40.505010015020025030035040045050030s-1115010501000950900800750700MPa2Fig.2Truestress-truestraincurvesunderdifferentdeformationtemperature3.3326705101520253035404550100150200250300350400450500=0.3Deformationresistance,MPaStrainrate,/s700750800850900950100010501100115005101520253035404550100150200250300350400450500=0.5Deformationresistance,MPaStrainrate,/s70075080085090095010001050110011503Fig.3Relationshipofdeformationresistanceanddeformationratesunderdifferentdeformationtemperature3.4OriginML40Cr)]4.0/(70556.0)4.0/(70556.1[)10/)(33263.296187.2exp(5.18643222.000097.008319.0εεεσ−−−TT&0.97ML40CrML40Cr41Gleeble-38002ML40Cr34ML40Cr[1].[J]2005263:31-34.[2]GillesPierson.Improvementsanddevelopmentsinthecoldheadingfield[J].Wirejournalinternational,1986,(12):51-55.[3].[J].2002,(2):22~24.[4].[J].2003,38(1):25~27.[5].[M].1991.