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1、OnthemicrostructureofsuperalloypatternformedbyselectivelasermeltingLiuJinhui1,WeiQingsong2,ZhangJia1,XiaoShengbing1,XieWenjuan1,ShiYusheng21ModernManufactureEngineeringCenter,UniversityofHeilongjiangSci.&Tech.Harbin,150027,China2StateKeyLab.OfMaterialProcessingandMoulding,HuazhongUniv
2、ersityofSci.&Tech.Wuhan,430074,ChinaAbstract:Supperalloycomponentshavebeenbuiltbyselectivelasermelting(SLM),buttheapplicationenvironmentofsuperalloycomponentsisusuallydifferentfromotherone.Owingtobeappliedinaerospace,theremarkablepropertiesofthesecomponentsshouldbepresentedintheend.Ac
3、cordingtothedeterminationrelationshipofmicrostructurestoperformance,theirmicrostructuremustmeetacorrespondingcriterion.TheinvestigationonthestateofsuperalloycomponentsformedbySLMiscarriedoninthiswork.UndertheconditionofSLMprocess,themicrostructuresfromdifferentareasofonepatternareanal
4、yzeddependingonthetheoreticalresultsofsolidificationandphaseevolvement.Opticalmicroscopyisusedforthemaintestingmeasure.TheformingandvariationphenomenoncanbediscoveredtoprovideknowledgeforthefutureSLMformingofsuperalloycomponents.Keywords:Selectivelasermelting;superalloy;Microstructure
5、1Introduction Polycrystallinenickelbasesuperalloys,arewidelyusedashigh-temperature,high-strengthcomponentsingasturbinessuchasstators,compressorsandturbinediscs,duetotheiroutstandingmechanicalproperty[1-3].Amongthem,Inconel718(IN718),aprecipitation-hardenable,niobium-modified,nickel-ba
6、sesuperalloythatisusedextensivelyintheaerospace,petrochemical,andnuclearindustriessinceitexhibitsgoodstrength,corrosionresistanceandweldingcharacteristics[4].ButmanufacturinganaerospacecomponentwithIN718throughtraditionalprocessingmethodisdifficultowingtoitsremarkablemechanicalpropert
7、iesatthesametime.Selectivelasermelting(SLM)isoneofsuccessfulrapidmanufacturingtechnologies,whichisusedforformingcomplicatedmetalcomponents[5,6].Itisinparticularappliedformanufacturingcomponentsthatcanhardlybedealwithunderregularfabricationroutes.Nowadays,SLMbeginstostepintotheaerospac
8、emanu
