连铸异型坯凝固过程的数值模拟

272Vol.27No.220054JournalofUniversityofScienceandTechnologyBeijingApr.20052004–11–102005–01–12(No.2002-566)(1982)HH[1]H[2,3]H1110m,(2)0.26,0.96,2.08,3.2m1)1)1)2)2)2)1)1000832)243003ANSYSSS400;;;TF777.71Fig.1Cross-sectionofabeamblankbycontinuouscastingFFFF2Fig.2SecondarycoolingzoneofabeamblankcasterAB1B2•174•2005222.1(1)(2)(q)(3)(4)(5)(6)(7)(8)2.2cTt=xkTx+ykTy+zkTz+q(1)kg/m3cJ/(kgK)kW/(mK)qJTts2.3eeNcNt+eeNxkxNx+NykyNyeqNq=0(2)=1,2,,r}NN=N1,N2,,Nrkxxkyyeq2.4(1)[4]SS400T=1536{415.3[%C]+12.3[%Si]+6.8[%Mn]+124.5[%P]+183.9[%S]+4.3[%Ni]+1.4[%Cr]+5.1[%Al]}(3)T=1536{90[%C]+6.2[%Si]+1.7[%Mn]+28[%P]+40[%S]+2.9[%Ni]+1.8[%Cr]+2.6[%Al]}(4)SS400T=1454T=1517(2)7.0g/cm37.4g/cm37.2g/cm3[4](3)3[56]K=mk.m85(4)L[4]C=C+LTT(5)CL.(5)[6]SS400(4)2.5(1)qW/cm2[7]q=268.0t(6)0400800120016002000/3SS400Fig.3ThermalconductivityofSS400steelusedintheheat-flowmodel2030405060/(WmK1)040080012001600/4SS400Fig.4SpecificheatofSS400steelusedintheheat-flowmodel0246/(kJkg11)Vol.27No.2•175•tt=60L/V(7)LmV,m/minSS400750mm×450mm×120mm0.6m0.78m/min239.78m3/h7.95q=268.019.6160L/V(8)(2)hq=hTTTT[4]0.4~0.6L/kg,20%EBolle[4]h=0.36W0.556(9)h=+0.35W(10),0W0.35L/(m2s),=0.27,W0.35L/(m2s),=0.35(3),,5.8,:q=T+2734T+2734(11)h=T+2732+T+2732T+273+T+273(12)2.6CITMH1.3ANSYS750mm×450mm×120mm1/453.16SS400R4661SS400Table1TechnicalparametersofSS400beamblankinoperation//(mmin1)/(Lmin1)/L123456715340.78240.253.436.473.894.802.912.992.9615500.82243.343.486.994.665.693.133.743.7515190.69237.353.355.603.273.922.402.552.325Fig.5Finiteelementmodelfortemperatureanalysis•176•200527RSS400900~1250730~900SS4007SS400R()900SS400R110,120156550,600780/m100/m3.28,SS40015mmR12mm18mm3.3927#SS400RR3.4SS40031#0510152025/m6SS400RFig.6CalculatedtemperaturesofanSS400beamblank0510152025/m7SS400RFig.7TemperatureplotatdifferentpointsonthesectionofanSS400beamblankR6008001000120014001600/14231/21423....8SS400Fig.8TemperaturedistributionofanSS400beamblank,moldexitR6008001000120014001600/927#SS400Fig.9TemperaturedistributionofanSS400beamblank,27#rol-ler1.2.12Vol.27No.2•177•150132#142231#32#,3.5RR4(1)ANSYSSS400100mm(2)SS400R12mm(3)RR(4)SS400R(5)100/m(6)SS40031#32#[1]..2001.126[2]KimK,HanHN,YeoT,etal.Analysisofsurfaceandinternalcracksincontinuouslycastbeamblank.IronmakingSteelmak-ing,1997,24(3):249[3]LeeJE.Predictionofcracksincontinuouslycaststeelbeamblankthroughfullycoupledanalysisoffluidflow,heattransfer,anddeformationbehaviorofasolidifyingshell.MetallMaterTransA,2002,31A(1):225[4]..1990[5]..1995[6]..1996[7].:[]..2000NumericalsimulationofthermalprocessingincontinuouslycastbeamblankLOUJuanjuan1),BAOYanping1),LIUJianhua1),SUNWei2),DUSonglin2),HUANGSheqing2)1)MetallurgicalandEcologicalEngineeringSchool,UniversityofScienceandTechnologyBeijing,Beijing100083,China2)MasteelCo.Ltd,Maanshan243003,ChinaABSTRACTThesolidificationinabeamblankwasnumericallysimulatedbyusingANSYScommercialsoft-wareinordertoanalyzesurfacalandinternalcracksinthebeamblank.Theboundaryconditionswerebasedonme-asuredtechnicalparametersinpracticalproduction.Thesimulatedresultisinaccordancewiththemeasuredsurfacetemperatureofthebeamblank.ItisshownthatthesurfacaltemperatureofSS400beamblankisinthebrittlenesstemperaturezoneexceptthatofthefilletunderthepresentcondition.Inordertomakethesurfacetemperatureofthebeamblankintotheplastictemperaturezonebeforeitgoesintothestraighteningzone,itisnecessarytoweakentheintensityofsecondarycooling.KEYWORDSbeamblank;continuouscasting;solidification;secondcooling;numericalsimulation