高铝锌合金比重偏析凝固过程数值模拟

:100321545(2003)0420017204,,(,471039):,PHOENICS,,,:;;:TG29:ATheSolidificationSimulationofZn2AlAlloywiththeConsiderationofGravitationalSegregationZhangZhanling,NiFeng,YangLiushuan(MaterialScienceandEngineeringCollege,HenanUniversityofScienceandTechnology,Luoyang471039,China)Abstract:Thetwo2phaseflowmodelofthesolidificationisestablishedandtheequationsaredifferentiatedandcom2putedin32Dcylindrical2polarcoordinationsystembyPHOENICStosimulatethegravitationalsegregationoftheZn2Alalloy.ltismanifestedthatthecomputedresultsarewellinagreementwiththeexperimentsindicatingthemodelcanbeusedtosimulatethegravitationalsegregationduringthesolidification.Keywords:Zn2Alalloy;Gravitationalsegregation;Solidificationsimulation,[1],,,,1,ZA27492380,,7.14gPcm3,2.70gPcm3,5.00gPcm3(Al)57%(w):(1999460014):2003201223,,[2],[3]22.1,,:(1);(2);(3)[4],,(Al),,(Al),;(4)[5],,;(5),184200382.2[6,7],:(,,)=+,:5()5t+¨(U)=¨(¨)+S+Sint+Sb(1):,,,U,S,Sint,Sb(,):=u1,v1,w1=vl=1S=gravitySint=friction+buoySb=0(a)=u2,v2,w2=vl=2S=gravitySint=friction+buoySb=0(b)=h1=(vlPPrl)=1S=0Sint=SnSb=Ss(c)=h2=(vlPPrl)=2S=0Sint=SnSb=Ss(d)=g1=0=1S=0Sint=SxSb=0(e)=g2=0=2S=0Sint=SxSb=0(f),(a),(b)(1);(c),(d)(1)[8];(e),(f)(1)12(Al):1,2(Al),g1,g2(Al),h1,h2(Al),u1,v1,w1,u2,v2,w2(Al),vl,Prl,(Al)0gravity,friction,buoy,Sn,Ss,Sx(Al)(1),(Al),,1(Al)[9],(Al):8120038friction=6vlr(U1-U2)Vg243r3(2):V,r(Al),U1,U2(Al)(2)(Al):buoy=1(Vg2)g(3):g(3)(Al),,,,;,:Sn=(g1V)1mL(4)Sx=(g1V)1m(5):m(Al),L(4),,:,h=f(T),:T=g(h)(6),h=g1h1+g2h2(7)(6),(5)g1g2,:c=c1g11+c2g22g11+g22(8):c1,c22.3[10](1)PP,P:Ss=A(i,j)[T(t,j)-T(t,i)]rh(i,j)+D(i)+D(j)(9):i,jij=6,A(i,j)i,rh(i,j)i,D(2),,,;,0;,,1,02.4PHOENICS3ZA27,90mm,220mm,,765K,,401155=24200112,21230mm180mm11/mmw(Al)P%w(Al)P%306510013517023.2527.5728.1028.8228.3023.5025.7026.8927.7729.1091184:2,ZA27(1),,,,,4(1),ZA27(2),[1]HabibyF,etal.Macrosegregationandundersideshrinkageinsandcastzinc27%2aluminumalloy[J].AFSTransactions,1984,(92):263269[2],.ZA27[J].,1990,11(1):5462[3],,.[M].:,1997:3540[4],,.[M].:,1987:7377[5].[M].:,1985:15[6].[M].:,1985:9194[7].[M].:,1988:5660[8].[M].:,1997:714[9].[M].:,1988:4246[10],.[M].:,1995:7581:,1967,,,,(16)p,m,m(3)FeMnSiCrNiCon,m,,700,m,(4)FeMnSiCrNiCo,,[1].[J].,1993,15(2):110[2].[J].,1993,15(3):18[3]OtuboJ,MeiPR,KoshimizuS.Productionandchar2acterizationofstainlesssteelbasedFe2Cr2Ni2Mn2Si(2Co)shapememoryalloys[J].JournaldePhysique,1995,5:427432[4]DunneDP,LiH.Themechanismofthermomechani2caltrainingofnewlydevelopedFe2Mn2Si2Cr2Cushapememoryalloy[J].JournaldePhysique,ColloqueC8,1995:415420[5]AnderssonM,AgrenJ.EffectofprestrainingandtrainingonthetransformationinFe2Mn2Sial2loys[J].JournaldePhysique,ColloqueC8,1995:457461[6],,.[M].:,2000:1952410220038