The effect of plasma nitriding on the fatigue behavior of the Ti-6Al-4V alloy
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2019
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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 N2, Ar, and H2. 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: , , "-Ti2N, and -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 and phases of the lamellar microstructure.
Como referenciar
CASTRO, MICHELE C.B. de; COUTO, ANTONIO A.; ALMEIDA, GISELE F.C.; MASSI, MARCOS; LIMA, NELSON B. de; SILVA SOBRINHO, ARGEMIRO da; CASTAGNET, MARIANO; XAVIER, GLEICY L.; OLIVEIRA, RENE R. The effect of plasma nitriding on the fatigue behavior of the Ti-6Al-4V alloy. Materials, v. 12, n. 3, p. 1-13, 2019. DOI: 10.3390/ma12030520. Disponível em: http://repositorio.ipen.br/handle/123456789/30040. Acesso em: 12 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.