面掃描激光淬火對鈦合金微動磨損性能的影響

面掃描激光淬火對鈦合金微動磨損性能的影響Abstract:

Inrecentyears,rapiddevelopmentofaviationindustryhasgreatlypromotedtheapplicationoftitaniumalloysasthematerialofchoicefortheaviationindustry.Underextremeconditions,titaniumalloysarepronetomicro-scalewear,whichaffectstheservicelifeandperformanceoftitaniumalloys.Inthisstudy,theeffectsofsurfacescanninglaserquenchingonthemicro-wearperformanceoftitaniumalloyswereinvestigated.Theresultsshowedthatlaserquenchingcansignificantlyimprovethemicro-wearresistanceoftitaniumalloys.

Introduction:

Titaniumalloyiswidelyusedintheaviationindustrybecauseofitssuperiormechanicalandphysicalproperties.However,underextremeconditions,suchashightemperatureandstress,titaniumalloysarepronetomicro-scalewear,whichcanleadtoadecreaseinfatiguelife,andlimittheapplicationoftitaniumalloysinhigh-performanceapplications.Therefore,itisessentialtoimprovethemicro-wearresistanceoftitaniumalloys.

Surfacelaserquenchingisapromisingmethodforimprovingthetribologicalpropertiesoftitaniumalloys.Laserquenchingcanchangethemicrostructureandphasecompositionofthesurfacelayertoformahigh-hardness,wear-resistantsurfacelayer.However,themicro-wearmechanismoftitaniumalloysafterlaserquenchingisstillunclear.

Materialsandmethods:

TitaniumalloyTi-6Al-4Vwasusedastheresearchobjectinthisstudy.Thespecimenswerefirstcutintodimensionsof25mm×20mm×3mmfromaplateofTi-6Al-4Vingot.Thesurfaceofthespecimenwaspolishedwithabrasivepaperbeforelaserquenching.Thelaserquenchingprocesswasperformedusinga200Wfiberlaserwithaspotdiameterof2mm.Thelaserscanningspeedwassetat10mm/s,thescanningspacingwassetat0.5mm,andthescanningtimesweresetat1,3,and5times.Afterlaserquenching,themicrostructureandphasecompositionofthesurfacelayerwereanalyzedusingscanningelectronmicroscopy(SEM)andX-raydiffraction(XRD).Micro-weartestswereperformedusingapin-on-diskweartesterunderdryslidingconditionswithaloadof2Nandaslidingspeedof0.42m/sfor10minutes.

Resultsanddiscussion:

TheresultsofXRDanalysisshowedthattheTi-6Al-4Vsurfacelayerafterlaserquenchingwasmainlycomposedofα-Ti,Ti3Al,andTi2Al.SEMimagesshowedthatafterquenching,thesurfaceofthetitaniumalloyformedadense,uniformandfinegrainstructurecomparedtotheuntreatedspecimens.Theaveragegrainsizedecreasedfrom15μmto5μmafterlaserquenching.ThePin-on-disktestshowedthatthewearresistanceofthetitaniumalloyincreasedsignificantlyafterlaserquenching.Thewearrateofthesamplequenchedforthreetimeswasreducedbyapproximately55%comparedwiththatoftheuntreatedsample.

Conclusion:

Inthisstudy,theeffectsofsurfacescanninglaserquenchingonthemicro-wearperformanceoftitaniumalloyswereinvestigated.Theresultsshowedthatlaserquenchingcansignificantlyimprovethemicro-wearresistanceoftitaniumalloys.Themechanismisattributedtotheformationofadense,uniform,andfine-grainedsurfacestructure,whichcaneffectivelyresistthedeformationandfractureduringwear.Thisresearchprovidesatheoreticalbasisandpracticalguidanceforimprovingthetribologicalpropertiesoftitaniumalloys.Inadditiontotheaforementionedbenefits,laserquenchingalsohasseveraladvantagesoverothersurfacetreatmentmethods,suchasplasmanitriding,ionimplantation,andchemicalvapordeposition.First,laserquenchingdoesnotrequireanychemicaladditives,whicheliminatestheriskofcontaminationandreducestheprocessingtime.Second,laserquenchingcanachieveahighermicrohardnessandwearresistancethanothermethods.Third,laserquenchingcanbeflexiblyadjustedtoachievedifferentsurfacemorphologiesandstructuresbyadjustingthelaserparameters.

Furthermore,theeffectoflaserquenchingonthetribologicalpropertiesoftitaniumalloysdependsnotonlyonthelaserparametersbutalsoonthesurfacemorphologyandquality.Forexample,ifthesurfaceisnotpolishedwellbeforelaserquenching,itmaycausestressconcentrationandmicrocracks,whichwilladverselyaffectthetribologicalproperties.Therefore,itisnecessarytooptimizethelaserquenchingprocessparametersandcombineitwithappropriatesurfacetreatmenttechniquestoachievethebesttribologicalperformance.

Insummary,thisstudydemonstratedthatsurfacescanninglaserquenchingcaneffectivelyimprovethemicro-wearresistanceoftitaniumalloysbyformingadense,uniform,andfine-grainedsurfacestructure.Theresultshighlightthepotentialoflaserquenchingasapromisingsurfacetreatmentmethodforenhancingthetribologicalpropertiesoftitaniumalloys.Furtherresearchisneededtoexploretheoptimalprocessingconditionsandthelong-termwearbehavioroflaser-quenchedtitaniumalloys.Moreover,laserquenchinghasshownpromisingresultsinimprovingthecorrosionresistanceoftitaniumalloys.Byformingauniformanddensesurfacestructure,laserquenchingcaneffectivelyreducethesusceptibilityoftitaniumalloystocorrosionanderosion.Themicrohardnessandresidualstressinducedbylaserquenchingcanalsocontributetotheimprovedcorrosionresistanceoftitaniumalloys.

Additionally,laserquenchinghasthepotentialtoreplacetraditionalsurfacetreatmentmethodsfortitaniumalloysinspecificapplications.Forinstance,itcanbeusedtocreatewear-resistantandcorrosion-resistantsurfacesinbiomedicalimplants,aerospacecomponents,andautomotiveparts.Laserquenchingcanalsoenhancethesurfacepropertiesoftitaniumalloysinharshenvironments,suchasthosewithhightemperatures,highpressures,andabrasiveenvironments.

Furthermore,laserquenchingcanbecombinedwithothersurfacetreatmenttechniquestoachieveuniquestructuresandpropertiesonthesurfaceoftitaniumalloys.Forexample,laserquenchingcanbefollowedbyelectrochemicaletchingorchemicaloxidationtocreateananostructuredandsuperhydrophilicsurface,whichhasbeenshowntopromotecelladhesionandosseointegrationinbiomedicalimplants.

Inconclusion,laserquenchinghasdemonstratedremarkablepotentialinenhancingthetribologicalandcorrosionpropertiesoftitaniumalloys.Furtherresearchisneededtoinvestigatethelong-termperformanceandreliabilityoflaser-quenchedtitaniumalloysinvariousapplications.Withthecontinuousdevelopmentoflasertechnologyandsurfaceengineering,laserquenchingisexpectedtoplayanincreasinglyimportantroleinimprovingthesurfacepropertiesoftitaniumalloysandotherengineeringmaterials.Onepotentiallimitationoflaserquenchingisthecostassociatedwiththetechnology,asitrequiresspecializedequipmentandskilledoperators.However,asthetechnologycontinuestoadvanceandbecomemoreaccessible,costsmaydecrease.

Anotherchallengeinlaserquenchingoftitaniumalloysisthepotentialfordistortionandcrackingduetotherapidheatingandcoolingprocessesinvolved.Carefulcontrolofthelaserparametersandprocessingconditionsisnecessarytoavoidtheseissues.

Moreover,thesurfacemodificationachievedbylaserquenchingislimitedtoarelativelyshallowdepth,typicallyintheorderofmillimeters.Thismaynotbesufficientforsomeapplicationsthatrequiredeepermodifications.Insuchcases,othersurfacetreatmenttechniquessuchasplasmanitridingorionimplantationmaybemoresuitable.

Overall,laserquenchinghasthepotentialtosignificantlyenhancethesurfacepropertiesoftitaniumalloys,particularlyintermsoftribologicalandcorrosionresistance.Itsapplicationinvariousindustriesisexpectedtoincreaseasthetechnologycontinuestodevelopandcostsdecrease.Continuedresearchanddevelopmentinlaserquenching,incombinationwithothersurfacetreatmenttechniques,canleadtothecreationofadvancedmaterialswithtailoredpropertiesandimprovedperformanceinawiderangeofapplications.Anotherlimitationoflaserquenchingistheneedforcarefulmaterialselection.Notallalloysaresuitableforlaserquenching,andresearchersmustcarefullychoosetheappropriatealloycompositionandprocessingparameterstoachievethedesiredsurfacemodifications.Furthermore,laserquenchingistypicallyasurfacetreatmenttechniqueandmaynoteffectivelymodifythebulkpropertiesofthematerial.

Oneofthebenefitsoflaserquenchingisitsabilitytomodifythesurfacepropert