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1、SolidFreeformFabrication2017:Proceedingsofthe28thAnnualInternationalSolidFreeformFabricationSymposium–AnAdditiveManufacturingConferenceTHEEFFECTOFARC-BASEDDIRECTMETALENERGYDEPOSITIONONPBFMARAGINGSTEELBishalSilwal*,ChristopherGerdmann*,StephenMigues*,KamramKar
2、del**,ShaowenXu*AndrewDurrence****DepartmentofMechanicalEngineering,GeorgiaSouthernUniversity,Statesboro,GA,30460**DepartmentofManufacturingEngineering,GeorgiaSouthernUniversity,Statesboro,GA,30460***GulfstreamAerospace,Savannah,GAAbstractWiththegrowingdemand
3、ofmetalbasedadditivemanufacturingitisinevitablethattheadditivelymanufacturedpartswillbeusedinconsolidationwithdifferentmanufacturingprocess.Arcbasedadditivemanufacturingisaprocessusedtoproducethree-dimensionalstructureusingweldingarcasapowersource.PowderBedFu
4、sion(PBF)isanadditivemanufacturingprocessusinglaserpowertogenerateathreedimensionalstructure.Inthispaper,theeffectofdirectenergydepositiononthePBFhasbeeninvestigated.Themicrostructurechangesandthemeltingregionarecharacterized.Acomputationalfluiddynamicsmodeli
5、susedtopredictthemeltregionandtemperatureinPBF.Keywords:Additivemanufacturing,weldingarc,GTAW,ABAM,MaragingSteel,PBFIntroductionTheadditivemanufacturing(a.k.a3dprinting)industrygeneratedover$5billionin2015andisexpectedtogrowoverfivetimesbyyear2021[4].Accordin
6、gtoASTM,therearesevencategoriesofadditivemanufacturing:photopolymerization,materialjetting,binderjetting,materialextrusion,powderbedfusion,sheetlaminationanddirectenegydeposition.Baseduponthepowersourceandfeedmaterial,itcanbefurtherclassifiedintomanyindividua
7、lprocesses(Figure1).Figure1:Additivemanufacturingtechnologybaseduponthepowersourceandfeedmaterialshape[12]1585Powderbedfusion(PBF)isoneofthemanycommerciallyavailableadditivemanufacturing(a.k.a3-dprinting)technologiestofabricatenetshapeparts.Inthisprocess,athi
8、nlayerofpowderonpowder-bedisslectivelymeltedbylaser,buildingavolumeonalayer-by-layerbasis.ThemajoradvantageofusingPBFisthatacomplexgeometrycanbeacheivedwhichmayyieldlongertimebyusingother
