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1、JournalofMaterialsProcessingTechnology120(2002)355364InductionheatingprocessofanAlSialuminumalloyforsemi-soliddiecastinganditsresultingmicrostructure*H.K.Jung,C.G.KangSchoolofMechanicalEngineering,EngineeringResearchCenterforNetShapeandDieManufacturing(ERC/NSDM),PusanNationalUniv
2、ersity,Pusan609-735,SouthKoreaAccepted10September2001AbstractDuringinductionheating,therelationshipbetweentimeandtemperaturemustbecontrolledexactlytoobtainahomogeneoustemperaturedistributionovertheentirecross-sectionalarea.Becausetheinitialsolidfractioninthesemi-soliddiecasting(S
3、DC)processisthemainparametertoachieveahomogeneousflowbehavioroftheliquidandsolidphasesandtopreventmacro-segregationeffectsintheSDCprocess,anaccuratelycontrollableinductionheatingmethodmustbeselectedforthereheatingprocess.Thepurposeofthisworkisnotjusttoobtainthedesiresolidfraction,
4、generallyabout50%,butalsotoensuretheoptimalinductionheatingconditionsofA356alloytoreducethetemperaturegradientofa76mmdiameter90mmlengthbilletandtoobtainafineglobularmicrostructurewithoutgraincoarsening(resultingmicrostructure).Thisworkshowsthat,inthecaseofathree-stepreheatingproc
5、essfortheSDCprocess,thefinalholdingtimeisthemostimportantfactortomaintainafineglobularmicrostructurewithoutgraincoarsening.#2002ElsevierScienceB.V.Allrightsreserved.Keywords:Inductionheatingprocess;Semi-soliddiecasting;Resultingmicrostructure;Solidfraction;Macro-segregation;Three-s
6、tepreheating;Finalholdingtime1.IntroductionInastudyontheinductionheatingprocessofSSM,Kapranosetal.[3]comparednumericalresultswiththeSemi-soliddiecasting(SDC)processoflightweighttemperatureoffivepointsinexperimentswithheating,materialssuchasaluminumalloys,besidesco-existingsoaking,
7、andpower-offstages.SebusandHenneberger[6]solidliquidphases,isofincreasinginterestformanufactur-proposedanewacousticsensorsystemfordeterminingtheingengineersandmaterialsscientists[17].Thisprocesssolidfractionofthereheatedbillet.Prikhodovskyetal.[7]clearlyshowsthatsemi-solidmateria
8、ls(SSMs)canbebothsimulatedthemicrostruct
