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1、東北大學(xué)碩士學(xué)位論文hbstractResearchonThixo--forgingProcessofSemi--solid6061AlloyAbstractBythetrendofautomotivelightweight，castingaluminumwheelshavebeenpopularizedintheautoindus仃ywithitscharacteristicsofrelativelylowprice，goodperformance，beautifulappearanceandSOon．Butforging
2、aluminumwheelswithcomplexproductionprocessandhighcostareusedinspecialareassuchassportsear,ascastingonesCannolongermeettheperformancerequirements．Semi—solidforgingisanearnetshapetechnology,andtheformingpartswiththistechnologyhavecloseperformancebutlowercosttofo哂ngon
3、esandmoreeffectivethancastingonesinlightweight，SOithasanimportantmeaningtoapplythistechnologyintheproductionofautomobilewheels．Semi-solidformingtechnology,FEM，6061alloyhavebeenintroducedinthispaper,andtheadvantagesandprospectsoftheapplicationofthixo··forgingwithsem
4、i··solid6061alloyintheproductionofautomobilewheelshavebeendescribed．Intheexperimentalparts，thestructurecharacteristicsofthesemi—solid6061alloybilletWasstudiedpreparedbyelectromagneticsemi—continuouscastingtechnologywithrawmaterialofpurealuminumetc．，andreheatingexpe
5、rimentswerealsocarriedouttostudythemicrostructureevolutionandtodefinetheoptimumreheatingprocess；usingDEFORM-3DFEMsimulationplatform，thecharacteristicsandvariationofmetalflow,temperaturefield，strainfield，stressfieldanddieloadwerestudiedtogetoptimumformingprocess；Fin
6、ally,theinfluenceofsolutiontemperature，solutiontime，agingtemperatureandagingtimeonmicrostructureandperformanceofformingpartswerestudiedtodefinetheoptimalheattreatmentprocess，andaverificationexperimentconducted．Theresultsareasfollows：(1)Semi—solid6061alloyingotwithg
7、oodsurfacequality,uniformandroselikegrainsCanbeobtainedbyelectromagneticsemi-·continuouscasting；theequal··area--circlegraindiametersofrim，middleandcenterpartare64．0gm，84．1gmand80．5gm，andtheminimumroundnessreached1．5：thesolidusandliquidusofobtainedalloyare580．34℃and
8、658．70℃，andwith53．08％liquidfractionat650℃；(2)ThequenchingstructurechangedsignificantlyandbecameuniformequiaxedgrainsV東北大學(xué)碩士學(xué)位論文Abstractbyreheatin
