激光立体成形Ti60合金组织和缺陷对性能的影响.pdf

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1、RareMetalMaterialsandEngineeringAvailableonlineatwww．sciencedirect．comVolume43，Issue3，March2014OnlineEnglisheditionoftheChineselanguagejournal瓣雾l_S~cienceDirectCitethisarticleas：RareMetalMaterialsandEngineering，2014，43(3)：0548—0552RelationshipamongMicrOstructure，Defectsan

2、dPer—formanceofTi60TitaniumAlloyFabricatedbyLaserSolid一Form■Ing。ChenJing，ZhangRui，ZhangQiang，YangJieqiong，HuangWeidongStateKeyLaboratoryofSolidificationProcessing,NorthwesternPolytechnicalUniversity,Xi'an710072，ChinaAbstract：Therelationshipamongthemicrostructure，thedefect

3、sandtheperformanceoftheTi60alloysamplesfabricatedbytheprocessoflasersolidforming(LSF)wasstudied，TheresultsindicatethatforTi60alloythelaserpowerinputhasaremarkableef-feetonthemicrostructureofLSFsamples．ConcretelyalargepowerinputformsaWidmanstattenmicrostructure，whileasmall

4、powerinputcausesabasketweavemicrostmcture．ThestressrupturepropertyoftheWidmanstattenstructureissignificantlylowerthanthatofthebasketweavestructure，thefornlershowsobviousintergranularfracture．whilethe1atershowsdimplerupture．Atthesametimethestressrupturepropertiesareaffecte

5、dbymetallurgydefectssuchasporosities．Whenthegasatomizedpowder(powderB)isusedascladdingmaterials．theporositieswillbeformedwithinthemicrostructureofLSFTi60．Whentheplasmarotationelec．trodepreparationpowder(powderA)isused，thereisnosuchdefectsobserved．Thehightemperatureenduran

6、cetestresultsshowthattherupturelifewillsignificantlydecreasefrommorethan100h(samplesdepositedwithpowderA)tolessthan25h(samplesdepositedwithpowderB1．Keywords：titaniumalloy；lasersolidforming；defect；microstructure；stressrupturepropertySincethedevelopmentoftheaerospaceindustr

7、yduringthevelopanewrepairabletechniquewhichcanbeusedtoresume1950s。theservicetemperatureoftitaniumalloyshasbeenthegeometricalpropertiesandthemechanicalpropertiesofgraduallyincreasedfrom300to600。C．Atpresent．thedethedamagedblisk．Basedonanadd—materialmanufacturingvelopmentofh

8、igh．temperaturealloysfacestwoproblems：theprinciple，theLSFprocessingcanbeusedtorepairdam—contradi