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1、SolidFreeformFabrication2017:Proceedingsofthe28thAnnualInternationalSolidFreeformFabricationSymposium–AnAdditiveManufacturingConferenceInvestigationofthemechanicalpropertiesonhybriddepositionandmicro-rollingofbainitesteelYouhengFu*,HaiouZhang*,GuilanWang†,HuafengWang†*StateKeyLaborator
2、yofDigitalManufacturingEquipmentandTechnology,HuazhongUniversityofScienceandTechnology,Wuhan430074,PRChina†StateKeyLaboratoryofMaterialsProcessingandDie&MouldTechnology,HuazhongUniversityofScienceandTechnology,Wuhan430074,PRChinaAbstractWireandarcadditivemanufacturing(WAAM)isanoveltech
3、nologywithhighefficiencyandlowcostformasspopularity.Whereas,thelackofdepositionaccuracyandmicrostructureperformancesarestillrestrictingitsongoingdevelopment.Inthispaper,hybriddepositionandmicro-rolling(HDMR)processhasbeenusedtoeliminatetheanisotropyinWAAMbainiticsteelsamples.Fortheprob
4、lemsofdeficientdeformationandlargerremeltingareaduetodeeperpenetrationandhighertemperaturegradient,aninitiallyoptimizedmicro-rollingmorphologyhasbeenproposed.Theresultsshow:thetensilestrengthsoffinishedpartare1275MPa,1256MPa,1309MPafortransverse(X),longitudinal(Y),perpendicular(Z)direc
5、tionsrespectively.Theelongationofthreedirectionsare17.4%,16.6%,17.7%respectively.Theimpacttoughnessis99J/cm2andtheaveragegrainsizereachesabout7μm.Comparedtothetraditionallyheavyrollingequipment,microrollerthispaperusedhastransformativecostadvantagetoachievehighvaluesofcomprehensivemech
6、anicalproperties.Keywords:additivemanufacturing;bainitesteel;mechanicalproperties;microrolling;welding1IntroductionBainitesteelisatypeofstructuralmaterialwhichhasbeenwidelyusedinmanymajorindustriesofthenationaleconomysuchasrailway,oilpipeline,engineeringmachinery,bridge,vehicle,archite
7、ctureandaerospaceareas,wherehighstrength,highductilityandgoodsolderabilityarerequiredtoadapttovariouslycomplexconditionsofserviceowingtothelowcost,perfectweldabilityandexcellentcomprehensivemechanicalproperties[1].Thereisnodoubtthatbainitesteelrepresentsthedevelopmentdirectionofmoder
