20104。、,,,;[1-8]。,、、,;,,,,。,,,()。11.1、1.6L/2.0L,1。,AlSi7Mg0.3(A356),1。。,··,,,(,241009):,,,、。,。:;;:TG146.2+1:A:1674-6694(2010)04-0035-04ResearchontheSecondaryDendriteArmSpacingofKeyPartsinSPMCastAluminumAlloyCylinderHeadsXIANGDa-wei,ZHANGBing-rong,TIANShen-jun,XUShuai(CheryAutomobileCo.,Ltd,EngineEngineeringResearchInstitute,Wuhu,Anhui241009,China)Abstract:Thisworkfocusedonanalyzingthesecondarydendritearmspacingofdifferentkeypositionsinonecylinderheadunderthesamenormalproductionprocess.Theresultshowsthatthesemi-permanentgravitycastprocessofcylinderheadsmettherequirementoftheproductdesign.Therelationshipamongthesecondarydendritearmspacing,foundrytechnologyandtheproductdesignwerediscussed.Basedonthestudyingofthesolidificationsequenceinthewholecylinderheadcasting,thefoundrytechnologyandprocesseswerereasonable.Keywords:aluminumalloycylinderheads,keyposition,secondarydendritearmspacingSiCuMgTiFeAlSi7Mg0.3(A356)6.5~7.5≤0.20.25~0.450.10~0.20≤0.201(,%):2010-07-06:(1982-),,,:。FOUNDRYEQUIPMENTANDTECHNOLOGY20104Aug.2010№42010835··20104Aug.2010№4,,。。1.2,,2;,3。:5mm;:,1mm~2mm。231.3。,4,,,,。(×100),10。42.2.15(),,SDAS,,3。3I5(5),,→→(A→B→C→D)。/μm/μm/μmABCD27.832.7236.2749.553.4758.221abcd70605040302010SDAS/μm5IAAABCDA-A1441056629036··20104,,,:2.22.2.1,,,6。、,。6,,。,。,。,→→→,7,,→→(A→B→C→D),Furer-Wunderlin。FurerWunderlinFurer-Wunderlin[6],,,:λ=5.5(Atf)1/3:λ———,μm;tf———,s;A———。A=τDLln(CL/CO)mL(1-k)(CO-CL):τ———Gibbs-Thompson;DL———;CL———,mol/L;CO———,mol/L;mL———;k———。,,(),。,(V=1/tf=166.375A/λ3)。,,。2.2.2(DAS),,。Flemings[7],,8。8AlSi7Mg,7I、400MPa3002001000108642204060801001200.2PS/MPa/μmUTS()/%37··20104Aug.2010№43.22。3.3,,。,,,,。4,,。2(31),,(DGI)(TCI),。(),。,A→D,→→(A→B→C→D)。,Flemings,→→(A→B→C→D),(5),。,,,,。3,,:1),,,,,SDAS;2),,,;3),,。:[1],,.[J].,2008,29(11):1546-1549.[2],,.[J].,2009,30(10):1367-1375.[3]MIGuo-fa,LIUXiang-yu,ZHUZhao-jun.Effectsofchillcastingprocessesonsecondaryden-dritearmspacinganddensificationofAl-Si-Mgalloy[J].SciencePress,Trans.NonferrousMet.Soc.China2007(17):1012-1017.[4]HongjunNi,BaodeSun,HaiyanJiang,etc.Ef-fectofJDN-IfluxonDASofA365alloyatdifferentcoolingrate[J].MaterialsSci-enceandEngineering,2003,A348:1-5.[5]MarcinKalka,JanuszAdamiec.Complexpro-cedureforthequan-titativedescriptionofanAl-Sicastalloymicrostructure.Materi-alsCharacterization,2006,56:373-378.[6],,.[J].,2004,53(12):1011-1014.[7]BingrongZhang,MaurizioGarro,AngeloGiglio.EffectofDendriteArmSpacingonMechanicalPropertiesofAluminumAlloyCylinderHeadsandEngineBlocks[J].SAEinternational,2004(2):101-110.[8]ZhangB,GarroM.an,TaglianoC.Dendritearmspacinginalu-minumalloycylinderheadspro-ducedbygravitysemi-perma-nentmold[J].PublishedbyMetallurgicalScienceandTechnolo-gy,2003,21(1):3-9.30938··