高铌TiAl合金包套锻造过程微观组织模拟.pdf

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1、RareMetalMaterialsandEngineeringAvailableonlineatwww．sciencedirect．comVolume43，Issue1，January2014OnlineEnglisheditionoftheChineselanguagejourna霸雾ScienceDirectSimulationofMicrostructureforHotPack-ForgingofaHighNbContainingTiAIAlloyChengLiang，ChangHui，TangBin，KouHongchao，LiJinshanStateKe

2、yLaboratoryofSolidificationProcessing，NorthwesternPolytechnicalUniversity,Xi'an710072，ChinaAbstract：TheDeform一3DsoftwarewasemployedtodescribethemicrostructureevolutionofahighNbcontainingTiA1billet(Ti一42A1—8Nb-0．2W一0．1v)duringitshotpack—forging．Toobtainthesimulationparameters．hotcompres

3、siontestswereperformedattemperaturesofl100-1250。CandstrainratesofO．00l-0．5s一．DynamicrecrystaIlizatiOnmodelwasdevelopedbyusinganundirectedmethod，andtherecrystallizedvolumefractionwasdescribedbyanAvrami—typeequation．TheconstitutivemodeloftheflowstressofthealloywasestablishedbasedonCingar

4、ahardeningequationandthedynamicrecrystallizationmode1．ThesimulatedresultsindicateaninhomogeneousdistributionofgrainstructureOccursduetofriction，heatlossandsingledirectionupsettingoperationinforgingprocess．Themicrostructureevolutionofthepresentalloyduringpack—forgingisvalidatedbycompari

5、ngthesimulatedresultswiththatoftheexperimentaldata．TheresultindicatesthattheimplementedmicrostructuremodulecanbeeffectivelyusedtopredictthemicrostructureevolutionofthehighNbcontainingTiA1alloyduringpack—forging．Keywords：highNbcontainingTiA1alloy；pack—forging；constitutivemodel；dynamicre

6、crystallizationHighNbcontainingTiA1alloysfTNBalloys)havebeenmeth0dtostudytheheattransfer。thedeformationbehaviorconsideredaspromisingcandidatesforstructuralorthemicrostructureevolutionduringthehotapplicationsduetoexcellentmechanicalpropertiesathighdeformation[【／J_Thus．ithasbeenusedexten

7、sivelyforthetemperature．However,theapplicationsinlargescaleofpredictionofthematerialresponseduringdeformation．TNBalloysarerestrictedduetotheirnaturalbrittleness【’．However．moststudieshavecOncentratedontheTheTNBalloyswithfinemicrostructuresandimprovedinvestigationsofordinaryalloyssucha