Effect of plasma nitriding on fatigue behavior of Ti-6Al-4V alloy
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2018
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INTERNATIONAL CONFERENCE ON ADVANCED COMPUTATIONAL ENGINEERING AND EXPERIMENTING, 12th
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The Ti-6Al-4V alloy is widely used in the manufacture of components that should have low density, 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 Ti-6Al-4V alloy with a lamellar microstructure (Widmanstätten type).
Nitriding was executed at 720 °C for 4 hours in an atmosphere with N2, Ar and H2. Samples
microstructure characterization 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 revealed the matrix phases α and β, and the phases Ɛ-Ti2N and δ-TiN in the
nitrided alloy. 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, both conditions exhibit similar behavior. The fracture surface of the fatigue tested specimens
clearly revealed the lamellar microstructure. The fracture mechanism appears to be due to cracking
at the interface of α and β 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. Effect of plasma nitriding on fatigue behavior of Ti-6Al-4V alloy. In: INTERNATIONAL CONFERENCE ON ADVANCED COMPUTATIONAL ENGINEERING AND EXPERIMENTING, 12th, July 1-5, 2018, Amsterdam. Proceedings... DOI: 10.20944/preprints201812.0326.v1. Disponível em: http://repositorio.ipen.br/handle/123456789/29470. Acesso em: 18 Apr 2024.
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.