6061合金半固态触变模锻成形工艺分析

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1、东北大学硕士学位论文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东北大学硕士学位论文Abstractbyreheatin