Influence of forming parameters on the final subgrain size during hot rolling of aluminium alloys

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1、JournalofMaterialsProcessingTechnology130–131(2002)245–249Influenceofformingparametersonthefinalsubgrainsizeduringhotrollingofaluminiumalloys*X.Duan,T.SheppardDEC,BournemouthUniversity,12ChristchurchRoad,BournemouthBH13NA,UKAbstractInthispaper,theinfluenceofrollingparam

2、eters(i.e.theslabtemperature,rollspeed,rolltemperatureandtheratioofthemeanthicknesstothecontactlengthintherollgapHm/L)onthesubgrainsizeisstudiedbythecombinationoffiniteelementmethod(FEM)withtheTaguchiexperimentalmethod.TheFEMisfirstappliedtosimulatetwoexistingsinglepas

3、slaboratoryrollingschedules.Thepredicteddistributionofsubgrainsizethroughthethicknessagreeswellwithmeasurements.Then,theTaguchimethodisappliedtodesignanorthogonalexperimental4table,L9(3).Atotalof9virtualexperimentsareanalysedbytheuseofFEM.Thepredictedresultsarethenan

4、alysedbytheuseoftheTaguchimethodfromwhichtheinfluenceofeachrollingparameteronthedeformedsubgrainsizeisgivenandexpressedinpercentage.Thestudyshowsthatrollingtemperaturehasthegreatestinfluenceonthefinalsubgrainsize,followedbytheparameterHm/L.Therollspeedandrolltemperature

5、havelittleeffectonthedeformedsubgrainsize.#2002ElsevierScienceB.V.Allrightsreserved.Keywords:Rolling;Aluminiumalloys;Grainsize;FEM;Taguchimethod1.IntroductionItwouldappeartobeatrivialtasktopredictthesubgrainsizeanddistribution,justsimplysubstitutingcomputednodalPredi

6、ctionofthesubgrainsizeanddistributionplaysastrainrateandnodaltemperaturedirectlyintoEqs.(1)andveryimportantroleinthepredictionofmicrostructural(2).Thereportedliteraturehasshownthatthecomputedchangesoccurringduringdeformation.Thesubgraindis-distributionofsubgrainsizeb

7、asedonsuchacomputationistributionandthemeansizehaveasignificantinfluenceonincorrect[2].Hence,somemodificationsmustbemadetomechanicalproperties:determiningthestrength,ductility,Eqs.(1)and(2)whenincorporatinginFEMprograms.texture,etc.Thusknowledgeofthedistributionofsubgra

8、inForthecontrolofproductproperties,itwouldbeverysizeiscriticalforqualitycontrol.usefultoknowtheextentofinfluenceofeachformingItisgen