Effect of the phase composition and structure of titanium alloys on their interaction with nitrogen during low-temperature ion nitriding

Ilin, Alexander; Скворцова, С. В.; Петров, Л. М.; Лукина, Е.А.; Chernysheva, A. A.

doi:10.1134/s0036029506050077

Cited by 8 publications

(5 citation statements)

References 2 publications

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“…Nitrogen atoms harden the diffusion zone with a profile that has its maximum at the near surface and gradually decreases toward the bulk. The depth of nitrogen diffusion is dependent on the process parameters as well as the phase composition of titanium alloys due to different solubility limits and diffusion rates of nitrogen in α-and β-titanium [5,7,59]. Nitrogen diffuses three times faster in β-Ti compared with α-Ti but has limited solubility in the β-phase [60,61].…”

Section: Classification Of Titanium Alloysmentioning

confidence: 99%

“…Nitrogen diffuses three times faster in β-Ti compared with α-Ti but has limited solubility in the β-phase [60,61]. A study conducted by Il'in et al [59] revealed that the addition of α-stabilizing elements such as Al slowed down the diffusion of nitrogen in α-titanium alloys. Conversely, β-titanium alloys had a shallow diffusion zone due to inadequate solubility of nitrogen in the β-phase.…”

Section: Classification Of Titanium Alloysmentioning

confidence: 99%

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Plasma Nitriding of Titanium Alloys

Edrisy¹,

Farokhzadeh²

2016

Plasma Science and Technology - Progress in Physical States and Chemical Reactions

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Titanium alloys are found in many applications where weight saving, strength, corrosion resistance, and biocompatibility are important design priorities. However, their poor tribological behavior is a major drawback, and many surface engineering processes have been developed to enhance wear in titanium alloys such as nitriding. Plasma (ion) nitriding, originally developed for ferrous alloys, has been adopted to address wear concerns in titanium alloys. Plasma nitriding improves the wear resistance of titanium alloys by the formation of a thin surface layer composed of TiN and Ti 2 N titanium nitrides (e.g., compound layer). Nonetheless, plasma nitriding treatments of titanium alloys typically involve high temperatures (700-1100°C) that promote detrimental microstructural changes in titanium substrates, formation of brittle surface layers, and deterioration of mechanical properties especially fatigue strength. This chapter summarizes the previous and ongoing investigations in the field of plasma nitriding of titanium alloys, with particular emphasis on the authors' recent efforts in optimization of the process to achieve tribological improvements while maintaining mechanical properties. The development of low-temperature plasma nitriding treatments for α + β and near-β titanium alloys and further wear improvements by alteration of near-surface microstructure prior to nitriding are also briefly reviewed.

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Section: Classification Of Titanium Alloysmentioning

confidence: 99%

Section: Classification Of Titanium Alloysmentioning

confidence: 99%

Plasma Nitriding of Titanium Alloys

Edrisy¹,

Farokhzadeh²

2016

Plasma Science and Technology - Progress in Physical States and Chemical Reactions

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“…The samples were hydrogenated at 900°С using gaseous hydrogen at a pressure of to 80 kPa and using a Sieverts type apparatus. 1 The hydrogen con tent reached in the samples is 5.2 at %. The samples were marked as follows: the hydrogen free alloy is Alloy 1 and the sample with 5.2 at % H is Alloy 2.…”

Section: Methodsmentioning

confidence: 99%

“…These alloys exceed industrial high temperature titanium alloys in these characteristics and can compete with steels and nickel alloys at operating temperatures of to 700-750°С [1]. Alloys based on orthorhombic titanium alu minide Ti 2 AlNb (O phase) [1] are the most manufactur able and show promise for aerospace engineering appli cations. However, the preparation of deformed half fin ished products from these alloys is difficult.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen on the structure of quenched orthorhombic titanium aluminide-based alloy and phase transformations during subsequent heating

Khadzhieva

Илларионов

Попов

et al. 2013

Phys. Metals Metallogr.

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Abstract-The effect of hydrogen on structure formation and changes in the volume fractions of phases in an alloy based on orthorhombic titanium aluminide (O phase) alloy upon its quenching is studied. X ray diffrac tion analysis is used to determine the lattice parameters of phases. It has been shown that hydrogen is dis solved mainly in the β 0 phase. Differential thermal analysis is used to determine stages and temperature ranges of phase transformations during heating; it was found that introduced hydrogen shifts the β 0 → O and reverse O → β 0 transformations into the low temperature range; the enthalpies of transformation are calcu lated.

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“…However, like titanium, this alloy has poor wear resistance. The surface treatment of titanium-based alloys is widely used to enhance their wear resistance, and nitriding attracts special attention of researchers for the surface hardening of these alloys [6][7][8][9][10]. The good biocompatibility of titanium nitride with both blood and bone tissue [11,12], as well as its high mechanical, tribological, and corrosion-resistant characteristics, determine the use of titanium nitride for protecting surfaces of medical implants.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen heat treatment on antifriction properties of nitrided VT6 titanium-based alloy

et al. 2016

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A comparative study of the antifriction characteristics of specimens of the VT6 titanium-based alloy subjected to nitriding without preliminary treatment and after hydrogen heat treatment has been carried out. Hydrogen heat treatment that precedes nitriding reduces the coefficient of friction of the nitrided specimens of the VT6 alloy in pair with the 12Kh18N10T stainless steel by 4-9% under dry friction and increases it by ~47% in a working fluid, which is a 0.9% NaCl solution. Hydrogen heat treatment combined with ionplasma nitriding reduces the coefficient of friction in working fluid by ~41%.

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Effect of the phase composition and structure of titanium alloys on their interaction with nitrogen during low-temperature ion nitriding

Cited by 8 publications

References 2 publications

Plasma Nitriding of Titanium Alloys

Plasma Nitriding of Titanium Alloys

Effect of hydrogen on the structure of quenched orthorhombic titanium aluminide-based alloy and phase transformations during subsequent heating

Effect of hydrogen heat treatment on antifriction properties of nitrided VT6 titanium-based alloy

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