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      The Effect of Plasma Nitriding on the Fatigue Behavior of the Ti-6Al-4V Alloy

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          Abstract

          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 2N, 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.

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          The effect of machined topography and integrity on fatigue life

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            Enhancing the microstructure and properties of titanium alloys through nitriding and other surface engineering methods

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              Effect of microstructure on ultra-high cycle fatigue behavior of Ti–6Al–4V

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                09 February 2019
                February 2019
                : 12
                : 3
                : 520
                Affiliations
                [1 ]Center for Materials Science and Technology, Instituto de Pesquisas Energéticas e Nucleares, São Paulo 05508-000, Brazil; michelebiondo36@ 123456gmail.com (M.C.B.d.C.); acouto@ 123456ipen.br (A.A.C.); nblima@ 123456ipen.br (N.B.d.L.); mcastag@ 123456ipen.br (M.C.); gleicy.limaxavier@ 123456gmail.com (G.L.X.); rolivier@ 123456ipen.br (R.R.O.)
                [2 ]Department of Materials Engineering and Nanotechnology, Universidade Presbiteriana Mackenzie, São Paulo 01302-907, Brazil; marcos.massi@ 123456mackenzie.br
                [3 ]Department of Materials and Processes, Instituto Tecnológico de Aeronáutica—ITA/DCTA, São José dos Campos 12228-900, Brazil; argemiro@ 123456ita.br
                Author notes
                [* ]Correspondence: gisele_fab@ 123456hotmail.com ; Tel.: +55-11-99639-8967
                Author information
                https://orcid.org/0000-0003-1503-1582
                https://orcid.org/0000-0003-4158-2337
                https://orcid.org/0000-0001-7227-9176
                Article
                materials-12-00520
                10.3390/ma12030520
                6384831
                30744088
                a693b71a-9c96-452f-818f-d32056e47766
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 26 December 2018
                : 30 January 2019
                Categories
                Article

                ti-6al-4v alloy,plasma nitriding,fatigue
                ti-6al-4v alloy, plasma nitriding, fatigue

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