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1、OnthemicrostructureofsuperalloypatternformedbyselectivelasermeltingLiuJinhui1,XiaoShengbing1,WeiQingsong2,XieWenjuan1,XieXuedong1,ZhangJia1,ShiYusheng21ModernManufactureEngineeringCenter,UniversityofHeilongjiangSci.&Tech.Harbin,150027,China2StateKeyLab.OfMaterialPro
2、cessingandMouldingTech.HuazhongUniversityofSci.&Tech.,Wuhan,430074,ChinaAbstract:Supperalloycomponentshavebeenbuiltbyselectivelasermelting(SLM),buttheapplicationenvironmentofsuperalloycomponentsisusuallydifferentfromotherone.Owingtobeappliedinaerospace,theremarkable
3、propertiesofthesecomponentsshouldbepresentedintheend.Accordingtothedeterminationrelationshipofmicrostructurestoperformance,theirmicrostructuremustmeetacorrespondingcriterion.TheinvestigationonthestateofsuperalloycomponentsformedbySLMiscarriedoninthiswork.Underthecon
4、ditionofSLMprocess,themicrostructuresfromdifferentareasofonepatternareanalyzeddependingonthetheoreticalresultsofsolidificationandphaseevolvement.Opticalmicroscopyisusedforthemaintestingmeasure.Theformingandvariationphenomenoncanbediscoveredtoprovideknowledgeforthefu
5、tureSLMformingofsuperalloycomponents.Keywords:Selectivelasermelting;superalloy;Microstructure1Introduction Polycrystallinenickelbasesuperalloys,arewidelyusedashigh-temperature,high-strengthcomponentsingasturbinessuchasstators,compressorsandturbinediscs,duetotheirout
6、standingmechanicalproperty[1-3].Amongthem,Inconel718(IN718),aprecipitation-hardenable,niobium-modified,nickel-basesuperalloythatisusedextensivelyintheaerospace,petrochemical,andnuclearindustriessinceitexhibitsgoodstrength,corrosionresistanceandweldingcharacteristics
7、[4].ButmanufacturinganaerospacecomponentwithIN718throughtraditionalprocessingmethodisdifficultowingtoitsremarkablemechanicalpropertiesatthesametime.Selectivelasermelting(SLM)isoneofsuccessfulrapidmanufacturingtechnologies,whichisusedforformingcomplicatedmetalcompone
8、nts[5,6].Itisinparticularappliedformanufacturingcomponentsthatcanhardlybedealwithunderregularfabricationroutes.Nowadays,SLMbeginstostepint
