The effect of plasma nitriding on the fatigue behavior of the Ti-6Al-4V alloy

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dc.contributor.authorde Castro M.C.B.
dc.contributor.authorCouto A.A.
dc.contributor.authorAlmeida G.F.C.
dc.contributor.authorMassi M.
dc.contributor.authorde Lima N.B.
dc.contributor.authorSobrinho A.S.
dc.contributor.authorCastagnet M.
dc.contributor.authorXavier G.L.
dc.contributor.authorOliveira R.R.
dc.date.accessioned2024-03-12T23:53:52Z
dc.date.available2024-03-12T23:53:52Z
dc.date.issued2019
dc.description.abstract© 2019 by the authors. The Ti-6Al-4V alloy is widely used in the manufacture of components that must have low density and high corrosion resistance and fatigue strength. The fatigue strength can be improved by surface modification. The aim of this study was to determine the influence of plasma nitriding on the fatigue behavior of a Ti-6Al-4V alloy with a lamellar microstructure (Widmanstätten type). Nitriding was executed at 720 °C for 4 h in an atmosphere with N 2 , Ar, and H 2 . Microstructure characterization of the samples was carried out by X-ray diffraction analysis, optical microscopy, and scanning electron microscopy. The average roughness of the specimens was determined, and fatigue tests were executed in a bending-rotating machine with reverse tension cycles (R = -1). X-ray diffraction analysis of the nitrided alloy revealed the following matrix phases: α,β, ε-Ti 2 N, and δ-TiN. A nitrogen diffusion layer was formed between the substrate and the titanium nitrides. Plasma nitriding resulted in an increase in low-cycle fatigue strength, whereas at high cycles of 200 MPa, both conditions exhibited similar behaviors. The fracture surface of the fatigue-tested specimens clearly revealed the lamellar microstructure. The fracture mechanism in the non-nitrided specimens appears to be due to cracking at the interface of the α and β phases of the lamellar microstructure.
dc.description.issuenumber3
dc.description.volume12
dc.identifier.doi10.3390/ma12030520
dc.identifier.issn1996-1944
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/35307
dc.relation.ispartofMaterials
dc.rightsAcesso Aberto
dc.subject.otherlanguageFatigue
dc.subject.otherlanguagePlasma nitriding
dc.subject.otherlanguageTi-6Al-4V alloy
dc.titleThe effect of plasma nitriding on the fatigue behavior of the Ti-6Al-4V alloy
dc.typeArtigo
local.scopus.citations16
local.scopus.eid2-s2.0-85061492948
local.scopus.subjectFracture mechanisms
local.scopus.subjectLamellar microstructure
local.scopus.subjectLow cycle fatigue strength
local.scopus.subjectMicrostructure characterization
local.scopus.subjectNitrided specimens
local.scopus.subjectNitrogen diffusion
local.scopus.subjectPlasma nitriding
local.scopus.subjectTi-6Al-4V alloy
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85061492948&origin=inward
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