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1、InternationalJournalofFatigue23(2001)607618www.elsevier.com/locate/ijfatigueEffectsofsurfacetreatmentsonthefatiguestrengthofAISI4340aeronauticalsteela,*bcaM.P.Nascimento,R.C.Souza,W.L.Pigatin,H.J.C.VoorwaldaDepartmentofMaterialsandTechnology,DMT/UNESP/FEG,StateUniversityofSa˜oPaulo,333,AribertoPerei
2、radaCunhaAve.,Guaratingueta´,Sa˜oPaulo12500-000,BrazilbFAENQUIL/DEMAR,Lorena,Sa˜oPaulo12600-000,BrazilcEMBRAER-LIEBHERR/EDE,40,ItabaianaStreet,Sa˜oJose´dosCampos,Sa˜oPaulo12237-540,BrazilReceived27March2000;receivedinrevisedform20November2000;accepted4February2001AbstractInternalresidualstressessign
3、ificantlyinfluencethefatiguestrengthofcoatedmaterials.Itiswellknownthatchromiumplatingisthemostusedelectrodepositedcoatingforimportantindustrialapplications.However,pressuretoidentifyalternativesortoimprovethechromiumelectroplatingprocesshaveincreasedinrecentyears,relatedtothereductioninfatiguestrengt
4、hofthebasematerialandtoenvironmentalrequirements.Thehighefficiencyandfluoridefreehardchromiumelectroplating(herecalledaccelerated)isanimprovementtotheconventionalprocess.OneenvironmentallysaferandcleaneralternativetohardchromiumplatingistungstencarbidethermalspraycoatingappliedbytheHighVelocityOxy-Fue
5、l(HVOF)process.Toincreasethefatiguestrengthofchromiumplatedmaterials,coatingthicknessandmicrocracksdensityareimportantparameterstobecontrolled.Tech-niquesascompressiveresidualstressesinducedbyshotpeeningandmultilayers,arealsoused.TheaimofthisstudywastoanalysetheeffectsonAISI4340steel,intherotatingbe
6、ndingfatiguebehaviour,ofthe:tungstencarbidethermalspraycoatingappliedbyHP/HVOFprocess;chemicalnickelunderplate,andshotpeeningprocessappliedbeforecoatingdeposition,incomparisontohardchromiumelectroplatings.Rotatingbendingfatiguetestresultsindicatebetterperformancefortheconventionalhardchromiumplating
7、inrelationtotheacceleratedhardchromiumelectroplating.Tungstencarbidethermalspraycoatingandacceleratedhardchromiumplateovernickelresultedinhigherfatiguestrengthwhencomparedtosamplesconventionaloraccele
