冷却速度对A356铝合金铸件组织影响的定量分析

A356()A356,,,,,,,;;;;A356TG146.2+1;TG113A2008(s)-0165-03QuantitativeanalysisoftheeffectsofcoolingrateonthemicrostructureofA356aluminumalloycastingHuangLonghui,ShaoGuangjie,YangYitao(SchoolofMaterialScienceandEngineering,ShanghaiUniversity,Shanghai,China,200072)Abstract:ThisarticleinvestigatedtherelationbetweenthestructuremorphologyandcastingconditionsofA356aluminumalloycasting.Withthehelpofstructureanalysisandcomputersimulationofcoolingrate,thequantitativerelationbetweeneutecticcontentandcoolingconditionwasstudied.Theresultsshowedthattheeutecticcontentinthesolidificationstructurewasincreasedwhilethecoolingrateofcastingincreased,theevolutionofprimaryphasewasfromcoarsedendritictorosettedendritic,Wecanpreciselypredictthecoolingconditionindifferentpositionsofthecastingbycomputersimulation,andprovideakindofreferenceforthepredictionofthemicrostructureandpropertyinthedifferentlocationsofcasting.Theselaythenecessaryfoundationforthedevelopmentofcastingpartswithcomplexshapeandvarieddemands.Keywords:Metalmold,eutecticcontent,coolingrate,computersimulation,A356:2008204209(5),,3,,,(),56333,36553,3@A356,,,[1]A356,,,,,,[2]A356,A356,1A356,15kW,,9139339539831013K5,(953K),323373423473523K,10mm10mm,,014%HF,EPIPHOT3001,212kg,,Adstefan(562008:071:198200072:021-171174182E-mail:dick2shu.edu.cn1)A,21A356()%wBSiFeCuMnMgTiZnAl6.250.1650.120.0060.430.0510.0121A3562A356/(kgm-1)/K/K/(kJkg-1)K/(Wm-1K-1)/(kJkg-1)/(m2s-1)/K(K)27009534730.961553891e20688785033.1A3562,,A562Al,,2Al,,,,,,,2Al,(a)913K(c)933K(d)953K(e)983K(f)1013K2,,,2Al,[3],2Al[4]3.2A356(953K),33,,2Al,,,[5],,A3562Al,,,,,,,,()33K()33K()3K()3K(f)53K3662008a2c7d42e4721[6],,,2Al,3.3,ADSTEFANA4(a)(c)44,,,,,[7],,,,,5,matlab,,[8],Al2Si,,2Al,,,,,,[9],,,,(a)(b)54(1),A356,,,(2),(3),[1].A356[J].,2004,20(1):23225.[2],,,.A357[J].,2004,53(3):1832186.[3]MAOWM,YANGJL,ZHAOAM,etal.Effectofpouringtemperatureonthemicrostructuresofthesemi-solidAlSi7Mgal2loy[J].JournalofUniversityofScienceandTechnologyBeijing,2001,23(1):38241.[4]CAOLH,DINGHF,FUHZ.SEMmicro2analysisforhotcracks[J].Castingtechnology,1997(1):47248.[5],,,[J].,2001,21(4):40243.[6].[J].,1995(1):23225.[7],.ZA85[J].,2006,55(4):3502354.[8]DUTTAB,RETTENMAYRM.Effectofcoolingrateontheso2lidificationbehaviourofAl2Fe2Sialloys[J].MaterialsScienceand,,32[],�[M],()6A356Engineering2000A28:218224.9..:2000.:71