Pretreatment Influence on Titanium Surface Properties After Gas Nitriding

Pohrelyuk, І. М.; Lavrys, S. М.; Sakharuk, О. М.; Stasyshyn, Ihor V.; Penkovyi, O. V.

doi:10.1007/s11665-017-2934-x

Cited by 15 publications

(7 citation statements)

References 33 publications

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“…3 c). Obviously, the reinforcing particles of titanium carbide TiC due to the high hardness and chemical inertness like fixed abrasives, were plowed or cut softer (mild) surface of the counterbody (bronze hardness -180 HV) [10]. It should be noted that TiC particles with the size of 20 microns have a tendency to brittle fracture and tear away from the Ti-6Al-4V titanium alloy matrix.…”

Section: Resultsmentioning

confidence: 99%

Tribological behavior of Ti–6Al–4V matrix composites reinforced with TiC

Pohrelyuk¹,

Lavrys²,

Savvakin³

2019

BALTTRIB

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The tribological properties of the composite reinforced with TiC carbide particles synthesized on the base of Ti-6Al-4V titanium alloy were investigated. It was determined that the wear resistance of the TMCs compared to Ti-6Al-4V titanium alloy, obtained by the method of powder metallurgy, in the friction pairs with Cu-10Al-4Fe-4Ni bronze and Fe-0.45C hardened steel under the conditions of boundary lubrication increased by 11 and 1.3 times, respectively. The wear mechanisms of the investigated tribopairs were determined. It was shown that due to the addition of solid TiC inclusions into Ti-6Al-4V alloy matrix, the wear mechanism of the friction pairs was changed from adhesion-fatigue to abrasive-fatigue.

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Section: Resultsmentioning

confidence: 99%

Tribological behavior of Ti–6Al–4V matrix composites reinforced with TiC

Pohrelyuk¹,

Lavrys²,

Savvakin³

2019

BALTTRIB

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“…It allows us to carry out saturation both in a dynamic atmosphere and in static conditions at atmospheric gas pressure, as w reproduce the technological regulation of heat treatment (cyclic changes of tem and heating and cooling rates) and provides the time-temperature and gas-dyn gime of saturation in one technological cycle. The methods of gas nitriding [41] a contact boriding [38][39][40] were chosen as the thermochemical treatments of titaniu Gas nitriding. For gas nitriding, gaseous nitrogen of commercial purity (GO 74) was used, which before supplying into the reaction chamber of the furnace w and freed from oxygen by filtering it through a capsule with silica gel and titaniu heated up to ~50 °C above the saturation temperature.…”

Section: Surface Engineeringmentioning

confidence: 99%

“…Then, the gaseous nitro pumped off and cooling occurred in a vacuum (10 −3 Pa) (Figure 2b). Based on p investigations [38,41], the saturation temperatures of 750 °C and 900 °C were ch…”

Section: Surface Engineeringmentioning

confidence: 99%

“…It allows us to carry out saturation both in a rarefied dynamic atmosphere and in static conditions at atmospheric gas pressure, as well as to reproduce the technological regulation of heat treatment (cyclic changes of temperature and heating and cooling rates) and provides the time-temperature and gas-dynamic regime of saturation in one technological cycle. The methods of gas nitriding [41] and non-contact boriding [38][39][40] were chosen as the thermochemical treatments of titanium.…”

Section: Surface Engineeringmentioning

confidence: 99%

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Comparison of Friction Behaviour of Titanium Grade 2 after Non-Contact Boriding in Oxygen-Containing Medium with Gas Nitriding

et al. 2023

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The surface characteristics and friction behaviour of titanium Grade 2 with modified nitride (TiN, Ti2N) and boride (TiB) compound layers were investigated. It was shown that during non-contact boriding in oxygen-containing medium of titanium, the diffusion processes take place mainly by the interscale mechanism; however, during nitriding, besides the traditional interscale diffusion mechanism, the grain boundary mechanism of diffusion of nitrogen atoms is also realized. The optimal set of surface roughness parameters (height and step parameters, a combination of kurtosis and asymmetry, and profile reference curve parameters) was obtained after boriding. It was determined that the intensity of the adhesive wear of the tribo-pairs with stainless steel and ultrahigh molecular weight polyethylene under dry sliding conditions was influenced not only by the hardness but also roughness of the modified surface layer. The lowest friction coefficient was fixed for the TiB compound layer in both tribo-pairs.

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“…However, its hardness and wear resistance are low, which limits its use. Various processing methods, including severe plastic deformation [16][17][18], thermal oxidation [19][20][21], carburization [22][23][24], nitriding [7,25,26], and boriding [7,27,28], have been proposed to improve its mechanical properties. During the processes of thermal oxidation, carburization, nitriding, and boriding, the atom diffusion behavior in pure titanium plays a key role in achieving good mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Stress on Oxygen Diffusion in Pure Titanium Using a Phase-Field Model

Wang,

Zhang,

Yang

2024

Materials

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Diffusion plays a vital role during the fabrication of many materials. It is a well-known fact that stress can influence diffusion behavior. In order to optimize material processing techniques, a quantitative evaluation of the effect of stress on diffusion is essentially required. By analyzing the free energy change in a Ti-O system during diffusion, a phase-field model was developed to address this issue. Using this model, the diffusion of oxygen atoms in pure titanium under different stress states was investigated. It was observed that the true equilibrium concentration of oxygen was proportional to its hydrostatic pressure. Tensile stress can increase the oxygen concentration. This raise in concentration decreased with temperature. However, the promotion of diffusion can be attained in deeper regions at a higher temperature. On the contrary, compressive stress inhibited the diffusion of oxygen in pure titanium. Under a certain compressive stress, the decrease in the oxygen concentration at the surface layer was more significant at a lower temperature, while a decrease could be observed at a deeper distance from the surface at a higher temperature. A thermodynamic explanation of the effect of stress on diffusion was given based on the proposed phase-field model.

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Pretreatment Influence on Titanium Surface Properties After Gas Nitriding

Cited by 15 publications

References 33 publications

Tribological behavior of Ti–6Al–4V matrix composites reinforced with TiC

Tribological behavior of Ti–6Al–4V matrix composites reinforced with TiC

Comparison of Friction Behaviour of Titanium Grade 2 after Non-Contact Boriding in Oxygen-Containing Medium with Gas Nitriding

Investigation of the Effect of Stress on Oxygen Diffusion in Pure Titanium Using a Phase-Field Model

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