TiN涂层

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Int.JournalofRefractoryMetalsandHardMaterials

journalhomepage:m.kkreddy.com/locate/IJRMHM

PerformanceofTiNandTiAlNcoatedmicro-groovedtoolsduringmachiningofTi-6Al-4Valloy

D.Arulkirubakaran,V.Senthilkumar?

DepartmentofProductionEngineering,NationalInstituteofTechnology,Trichy620015,India

articleinfoabstract

Inthepresentinvestigation,turningexperimentswereperformedonTi-6Al-4Valloywithcoated(TiN,TiAlN)anduncoatedcuttingtoolinsertswithdifferenttexturedpatternsfabricatedontherakesurface.Performanceofcoatedanduncoatedtexturedtoolswereevaluatedusingmachinabilityandsurfacecharacteristicparameterssuchascuttingforces,microhardness,surfaceroughness,chipformationandtoolwear.Basedonthemachinabil-ityevaluation,acomparativestudywasalsomadetoidentitythebetterperformingtoolwhilemachiningofTi-6Al-4Valloy.ExperimentalresultsrevealedthatTiAlNcoatedperpendiculartexturedcuttinginsertsexhibitbet-termachinabilityinallaspectswhencomparedwiththeothertypeofinserts.

?2016ElsevierLtd.Allrightsreserved.

Articlehistory:

Received29January2016

Receivedinrevisedform6October2016Accepted13October2016

Availableonline15October2016Keywords:

Ti-6Al-4ValloyTexturedtoolsTiN

TiAlNcoatedtoolsMachiningforceSurfaceroughnessToolwear

1.Introduction

Titaniumanditsalloysaremostlyusedinaerospaceenginecompo-nentsduetoitsexcellentpropertiessuchashighstrengthtoweightratio,goodcorrosionresistance,bettercreepresistance,toughness,du-rabilityhighstrengthattheelevatedtemperatures.However,therewerecertaindif?cultiesinmachiningoftitaniumalloysduetolowther-malconductivity,lowmodulusofelasticityandhighchemicalreactivity.Thusdecreasetheheatdissipationbetweenthetool-workinterfaces,in-creasethetoolwearandvibrationsonthemachinedsurface.Theabovedif?cultiesduringmachiningofTi-6Al-4Valloycanberesolvedbysur-facetexturingontherakefaceofuncoatedandcoatedtungstencarbideinserts[1–2].Surfacetexturingofcuttingtoolsplaysanimportantroleinreducingcuttingforces,frictionaleffectsandmaterialadhesiononthetool.KoshyandTovey[3]createdarealandlineartexturedpatternsontoolrakesurfacebyEDMandWEDMprocessesfortheturningof1045steeland6061aluminumalloyandconcludedthattheforcesonthefeeddirectionandcuttingdirectionwasreducedupto30%forthetexturedtoolwhencomparedwiththatofnon-texturedtool.Zeetal.[4]analyzedtheperformanceoftexturedpatternssuchasself-lubricat-ingtexturedtoolwithellipticalgroovesontherakeface(STT-R)andself-lubricatingtexturedtoolwithlineargroovesonthe?ankface(STT-F)withnon-texturedconventionaltoolsduringmachiningofTi-6Al-4Valloy.Itwasobservedthattexturedinsertsreducedthecutting

?Correspondingauthor.

E-mailaddresses:arul.kirubakaranbe@gmail.com(D.Arulkirubakaran),vskumar@nitt.edu(V.

PalDeyandDeevi[9]analyzedthesinglelayerandmultilayercoatedtoolsforwearresistanceduringmachiningofdifferentmaterials.Theperformanceofmultilayercoatedtool(TiAlN)wassuperiortothatofuncoatedtoolduetoitshighhardnessandthermalstability.Theperfor-manceofvariouscoatings(TiN,TiC,TiAlN,TiCNandAl2O3)oncuttingtoolswasanalyzedbyvariousauthorsonTibasedalloysandstainlesssteelmaterial.Itwasreportedthatthecoatedtoolsexhibitedbetterre-sultsthanuncoatedtools[10,11].Mohantyetal.[12]comparedtheper-formanceofcoatedanduncoatedtoolsduringmachiningof17–4PHstainlesssteelandevaluatedtoolwear,cuttingtemperature,chipmor-phology,chipthicknessandsurfaceroughness.Itwasfoundthatthe?ankwearwaslessandthesurface?nishwasgoodwhilemachiningwithmultilayercoatedtoolinserts.Machinabilityoflasersurfacetreat-edPHstainlesssteelusingTiAlNcoatedtoolshadbeeninvestigated;

http://dx.doi.org/10.1016/j.ijrmhm.2016.10.0140263-4368/?2016ElsevierLtd.Allrights

reserved.

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