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1、MaterialsandDesign31(2010)2245–2252ContentslistsavailableatScienceDirectMaterialsandDesignjournalhomepage:www.elsevier.com/locate/matdesShortCommunicationAcomparativeevaluationoffrictionandelectronbeamweldsofnear-atitaniumalloySureshD.Meshram*,T.MohandasMetalJoiningGroup

2、,DefenceMetallurgicalResearchLaboratory,Kanchanbagh,Hyderabad500058,IndiaarticleinfoabstractArticlehistory:ElectronbeamandfrictionweldingstudieshavebeencarriedoutonaTIMET834anear-atitaniumalloy.Received23July2009Thestudywasalsofocusedonthepost-weldheattreatmentaspectsand

3、theirinfluenceonmechanicalAccepted7October2009properties.TheinfluenceofparentmetalmicrostructureonthetoughnesshasbeenevaluatedtoexplainAvailableonline13October2009thetrendsobservedonthetoughnessofwelds.Electronbeamweldscontainedmicro-porositywhilefric-tionweldswerefreefrom

4、suchsolidificationrelateddefects.Frictionweldsexhibitedveryfineequiaxedpriorbgrainsascomparedtoelectronbeamwelds.Electronbeamweldsexhibitedbettercreepandstressrupturepropertiesandmarginallyhigherstrength.Theimpacttoughnessofboththeweldswascompa-rable.Post-weldageingofwelds

5、resultedinreductioninimpacttoughnessduetoprecipitationofsili-cidesalongthemartensitelathboundaries.Ó2009ElsevierLtd.Allrightsreserved.1.Introductionproportionofaandbphasesatatemperatureisdictatedbycom-position.ForfruitfulexploitationtheheattreatmentwindowoverThelowdensit

6、y,excellenthightemperaturemechanicalprop-whichtheproportionofthephasesremainsconstant(microstruc-ertiesandgoodcorrosionresistanceoftitaniumandtitaniumal-turestability)shouldbewide.Researchinthisdirectionhasledtoloyshaveledtoadiversifiedrangeofsuccessfulapplicationsforthed

7、evelopmentofTIMET834.Near-atitaniumalloy,TIMET834thedemandingperformanceandreliabilityrequirementsofthewasdevelopedtomeettheneedforthehightemperature,weld-medical,aerospace,automotive,petrochemical,nuclearandpowerable,Tialloywithimprovedcreepstrength,fatigueperformancege

8、nerationindustries[1–3].Titaniumexhibitshexagonalcrystalandfinedefecttolerantmicrostructureforcompressor