Fatigue improvement in low temperature plasma nitrided Ti–6Al–4V alloy

Farokhzadeh, K.; Edrisy, Afsaneh

doi:10.1016/j.msea.2014.10.008

Cited by 78 publications

(63 citation statements)

References 21 publications

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“…According to Yildiz et al [3], the nitride layer thickness was up to 2 µm, when the alloy was plasma nitrided at an average temperature of 700 °C. As per the studies of Farokhzadeh et al [1], on samples nitrided at 600 °C, the thickness of the nitride and diffuse layers were 2 and 44 µm respectively. In samples nitrided at 900 °C, the thicknesses of the nitride and diffuse layers were 5.8 and 19 µm respectively.…”

Section: Resultssupporting

confidence: 64%

“…Rodriguez et al [10] carried out nitriding at 850 °C and 900 °C for 1 to 4 hours and reported that the nitride layer had a positive effect on the fatigue properties, and this was caused by the compressive residual stress in the alloy, delaying thus the crack nucleation step. According to Farokhzadeh et al [1], plasma nitriding carried out at 600 °C and 900 °C for 24 hours revealed a 23 % improvement in fatigue strength of the Ti-6Al-4V alloy nitrided at 600 °C, compared to a non-nitrided alloy.…”

Section: Introductionmentioning

confidence: 99%

“…Among the various titanium alloys, Ti-6Al-4V is the most widely used as it has properties such as ease of manufacture, excellent corrosion resistance, biocompatibility, and low density. There are certain disadvantages related to the use of this alloy what include low surface hardness, low fatigue strength, low wear properties and high friction coefficient [1][2][3][4][5]. Fatigue failure of the Ti-6Al-4V alloy occurs when cyclic stresses are applied to it and the stress levels at which this failure occurs are below the yield stress of the alloy, which is usually determined from tensile tests [6].…”

Section: Introductionmentioning

confidence: 99%

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

Castro¹,

Couto²,

Almeida³

et al. 2018

Preprint

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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.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Castro¹,

Couto²,

Almeida³

et al. 2018

Preprint

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show abstract

“…Quenching and heat treatment have been found to effectively improve the resistance of metals to compression and tension because the treatment is applied to the entire body of the metal [1][2][3]. In addition, carburizing, nitriding and shot peening are applied when bending and twisting are anticipated, because these processes increase surface fatigue resistance [4][5][6][7][8][9][10]. It is well known that shot peening leads to an elevated surface hardness in conjunction with a high degree of compressive residual stress on the surface of the material, both of which improve fatigue strength [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of surface compressive residual stress introduced by surface treatment on fatigue properties of metallic material

et al. 2018

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Abstract. This study considers shakedown in evaluating the fatigue limit of metals with compressive residual stress at the surface. We begin by applying tension-compression fatigue tests to ASTM CA6NM under conditions of controlled load and displacement to obtain fatigue limit diagram in compressive mean stress. The results imply that shakedown occurs under the condition of controlled displacement, therefore, shakedown should be considered when evaluating the fatigue limit of metals with compressive residual stress at the surface.

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“…In the case of laser nitriding, it is dif cult to treat large surface areas. Moreover, there have been reports [5][6][7][8][9] that nitriding decreases fatigue strength while improving wear resistance. It is therefore obvious that several challenges related to nitriding must still be addressed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Gas Blow Velocity on the Surface Properties of Ti-6Al-4V Alloy Treated by Gas Blow IH Nitriding

et al. 2017

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In the present study, gas blow IH (Induction Heating) nitrided specimens were produced under variable nitrogen gas blowing velocities. This was done to investigate the effects of nitrogen gas velocity on the surface properties of Ti-6Al-4V alloy. The surface properties of the specimens were characterized using X-ray diffraction, scanning electron microscopy, a micro-Vickers hardness tester and nano-indentation tester. The results showed that the surface hardness and thickness of the hardened layer increased with increasing gas blowing velocity. This occurred because of the elevated temperatures in the interior of the alloy relative to the surface temperatures at a higher gas blowing velocity. Furthermore, increasing the magnetic eld strength around the IH coil and the eddy current density around the circumference of the specimen also accelerated the formation of a hardened layer on the surface of the titanium alloy. Consequently, a high-hardness layer can be formed by applying a treatment temperature less than the β transus of the Ti-6Al-4V alloy, while increasing the gas blowing velocity. This layer improves the wear resistance of the alloy by suppressing both grain coarsening and the formation of an acicular α phase.

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Fatigue improvement in low temperature plasma nitrided Ti–6Al–4V alloy

Cited by 78 publications

References 21 publications

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

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

Effect of surface compressive residual stress introduced by surface treatment on fatigue properties of metallic material

Effects of Gas Blow Velocity on the Surface Properties of Ti-6Al-4V Alloy Treated by Gas Blow IH Nitriding

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