Boriding kinetics and mechanical behaviour of AISI O1 steel

Elías-Espinosa, M.; Domı́nguez, Mariana; Кеддам, М.; Gómez-Vargas, Oscar; Arenas-Flores, A.; Hernández, Francisco Velasco; West, Anthony R.; Sinclair, Derek C.

doi:10.1179/1743294415y.0000000065

Cited by 28 publications

(26 citation statements)

References 45 publications

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“…TiB TiB {x(t = 0) = 0} = C TiB up ; for 18 wt -%B ≺ C ads ≺ 30.10 wt -%B and without TiB 2 phase (4) C TiB {x(t = 0) = 0} = C TiB low ; for C ads ≺ 18 wt -%B and without TiB 2 phase(5) …”

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confidence: 99%

A diffusion model for the titanium borides on pure titanium

Кеддам

Taktak

Taşgetiren

2016

Surface Engineering

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In the present study, commercial pure titanium was successfully plasma paste borided using borax paste at a temperature of 700, 750 and 800°C for 3, 5 and 7 h. The X-ray diffraction and scanning electron microscopy techniques revealed the presence of both TiB 2 top-layer and TiB whiskers sub-layer. The formation rates of the TiB 2 layer and TiB whiskers were found to have a parabolic character at all applied process temperatures. Based on the present Ti borides growth data, correspondent diffusion temperature and time, an analytical diffusion model was used to estimate boron diffusion coefficients and activation energies of the boride phases in a binary multiphase Ti-B system. Depending on the temperature and layer thickness, the activation energies of boron in TiB 2 and TiB phases were determined to be 137.55 ± 0.5 and 55.21 ± 0.5 kJ mol −1 , respectively. These values of boron activation energies for pure titanium were compared to the literature data. Nomenclature t the treatment time (s) C TiB2 up the upper limit of boron content in TiB 2 (=31.10 wt-% B) C TiB2 low the lower limit of boron content in TiB 2 (=30.10 wt-% B) C TiB up the upper limit of boron content in TiB (=18.50 wt-% B) C TiB low the lower limit of boron content in TiB (=18.00 wt-% B) C ads the adsorbed boron concentration in the boride layer (wt-%B). C 0 the boron solubility in the substrate (≈0 wt-%B) u the position of the (TiB 2 /TiB) interface or the TiB 2 layer thickness (µm) v the position of the (TiB/Ti) interface or the total layer thickness (µm) l the layer thickness of TiB (µm) k 1 the parabolic growth constant at the (TiB 2 /TiB) interface k 2 the parabolic growth constant at the (TiB/Ti) interface D TiB2 B the diffusion coefficient of boron in TiB 2 (m 2 s −1 ) D TiB B the diffusion coefficient of boron in TiB (m 2 s −1 )

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A diffusion model for the titanium borides on pure titanium

Кеддам

Taktak

Taşgetiren

2016

Surface Engineering

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“…Mathematically, Equation (11) can also be rewritten as follows: (14) where k 1 is the new parabolic growth constant at th (Fe 2 B/Fe) interface. The two unknown parameters  and  involved in Equations (12) and (13) have to be determined by substituting the expressions of timedependent parameters a(t) and b(t) into Equations (6) and (10). The two following algebraic equations were then obtained: (15) and (16) The possible solutions of algebraic system formed by Equations (15) and (16) are the following:…”

Section: The Integral Methodsmentioning

confidence: 99%

“…For this purpose, several kinds of approaches were cited in the reference works for analyzing the kinetics of formation of Fe 2 B layers formed on ferrous materials [13][14][15][16][17][18][19] with the presence or not of the boride incubation times. For example, Elias-Espinosa et al [13] proposed a kinetic model for investigating the kinetics of formation of AISI O1 steel by using the pack-boriding process. The principle of mass conservation at the (Fe 2 B/substrate) interface was considered to solve the diffusion problem with the presence of boride incubation times.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the growth kinetics of Fe2B layers by the integral method

Кеддам¹,

Kulka

2018

J min metall B Metall

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In this study, an alternative approach based on the integral method was proposed to estimate the values of boron diffusion coefficients in the Fe 2 B layers grown at the surface of Armco iron. The set of differential algebraic equations (DAE) system was obtained to estimate the value of activation energy for boron diffusion when pack-boriding of Armco iron in the range of 1123 to 1273 K taking into account the boride incubation time. The present model has been validated by making a comparison between the experimental value of Fe 2 B layer thickness obtained at 1253 K for 5 h and the predicted results by using two different approaches. A good agreement was observed between these two set of data.

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“…Ural (Ilyuschenko N.), Voronezh (Korotkov S., Permiakov V., Loskutov V.) and other. During the study of boriding process and solving a problem of friability of borided layer that was started from 1970-1980, considerable material for different boriding processes and its features was accumulated [4][5][6][7].…”

Section: Review Of the Problem Of Friability Reduction Of Borided Layersmentioning

confidence: 99%

Development of Innovative Method of Steel Surface Hardening by a Combined Chemical-Thermal Treatment

Kostyk

2016

EUREKA: Physics and Engineering

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The aim of the article is a hardening of the surface steel layers due to the combination treatment. Samples of steel 38Cr2MoAl were hardened by complex chemical and thermal treatment such as carburizing and subsequent boriding. It was established that surface double-layer hardening for steel 38Cr2MoAl with sequential saturation with atomic carbon (during carburizing) and atomic boron (during furnace boriding) at different temperatures allowed to form a boride layer with transition zone. The obtaining transition zone can improve operational properties of machine parts and tools by micro-friability reduction of diffusion layer. An optimal mode of complex chemical-thermal treatment (CTT) was obtained for the regime, which includes carburizing at 950 °C for 2 hours, boriding at 950 °C for 2 hours, which allows to get the best value for the surface hardness of 22 GPa with a maximum overall diffusion layer 1.4 mm. Due to the technology of combined treatment we can significantly reduce treatment time compared to traditional hardening means and significantly improve product performance properties due to the transition zone between the borides and the matrix of machine elements. The technology can be used in enterprises where there is any hardening furnace without additional installation or conversion of equipment.

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Boriding kinetics and mechanical behaviour of AISI O1 steel

Cited by 28 publications

References 45 publications

A diffusion model for the titanium borides on pure titanium

A diffusion model for the titanium borides on pure titanium

Analysis of the growth kinetics of Fe2B layers by the integral method

Development of Innovative Method of Steel Surface Hardening by a Combined Chemical-Thermal Treatment

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