Effects of electroplated zinc-nickel alloy coatings on the fatigue strength of AISI 4340 high strength steel

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dc.contributor.authorVoorwald, H. J. C.
dc.contributor.authorMiguel, I. M.
dc.contributor.authorCosta, M. Y. P.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-27T11:21:46Z
dc.date.available2014-05-27T11:21:46Z
dc.date.issued2005-12-01
dc.description.abstractIt is well known that fatigue behaviour is an important parameter to be considered in mechanical components subjected to constant and variable amplitude loadings. In combination with corrosion phenomenon, fatigue effects were responsible for proximally 64% of fails that occur in metallic parts of aeronautical accidents in the last 30 years. Recovered substrates have been extensively used in the aerospace field. Cadmium electroplating has been widely applied to promote protective coatings in aeronautical components, resulting in excellent corrosion protection combined with a good performance in cyclic loading. Ecological considerations allied to the increasing demands for corrosion resistance, resulted in the search for possible alternatives. Zinc-nickel alloys received considerable interest recently, since these coatings showed some advantages such as a good resistance to white and red rust, high plating rates and acceptation in the market. In this study the effects of zinc-nickel coatings electroplated on AISI 4340 high strength steel were analysed on rotating bending and axial fatigue strength, corrosion and adhesion resistance. Compressive residual stress field was measured by a X-ray tensometry prior to fatigue tests. Optical microscopy images showed coating thicknesses, adhesion and the existence of an uniform coverage of nearly all substrates. The fractured fatigue specimens were investigated using a scanning electron microscope. Three different zinc-nickel coating thicknesses were tested and comparison with rotating bending fatigue data from specimens cadmium electroplated and heat treated at 190°C for 3, 8 and 24 hours to avoid the diffusion of hydrogen in the substrate, was performed. Experimental results showed effect of coatings on the AISI 4340 steel behaviour when submitted to fatigue testing and the existence of coating thickness influence on the fatigue strength.en
dc.description.affiliationDepartment of Materials and Technology State University of São Paulo, Cep. 12516-410
dc.format.extent2599-2604
dc.identifier.citation11th International Conference on Fracture 2005, ICF11, v. 4, p. 2599-2604.
dc.identifier.scopus2-s2.0-84869850003
dc.identifier.urihttp://hdl.handle.net/11449/68677
dc.language.isoeng
dc.relation.ispartof11th International Conference on Fracture 2005, ICF11
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAdhesion resistance
dc.subjectAeronautical components
dc.subjectAerospace field
dc.subjectAISI 4340 steel
dc.subjectAxial fatigue
dc.subjectCadmium electroplating
dc.subjectCoating thickness
dc.subjectCompressive residual stress
dc.subjectCorrosion phenomena
dc.subjectCyclic loadings
dc.subjectFatigue behaviour
dc.subjectFatigue effects
dc.subjectFatigue specimen
dc.subjectFatigue strength
dc.subjectMechanical components
dc.subjectMetallic part
dc.subjectPlating rates
dc.subjectRotating bending
dc.subjectRotating bending fatigue
dc.subjectScanning Electron Microscope
dc.subjectTensometry
dc.subjectUniform coverage
dc.subjectVariable amplitude loading
dc.subjectZinc-nickel
dc.subjectZinc-nickel alloys
dc.subjectAdhesion
dc.subjectAerodynamics
dc.subjectCadmium
dc.subjectCadmium plating
dc.subjectCorrosion resistance
dc.subjectElectroplating
dc.subjectFatigue testing
dc.subjectFracture
dc.subjectHigh strength steel
dc.subjectHydrogen
dc.subjectNickel alloys
dc.subjectNickel coatings
dc.subjectOptical microscopy
dc.subjectProtective coatings
dc.subjectScanning electron microscopy
dc.subjectSteel testing
dc.subjectSubstrates
dc.subjectThickness measurement
dc.subjectZinc
dc.subjectZinc coatings
dc.subjectBending strength
dc.titleEffects of electroplated zinc-nickel alloy coatings on the fatigue strength of AISI 4340 high strength steelen
dc.typeTrabalho apresentado em evento

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