Diffusional Growth Kinetics of Boride Layers on Iron-Chromium Alloys

Dybkov, V. I.; Goncharuk, L. V.; Khoruzha, V. G.; Meleshevich, K.A.; Samelyuk, A. V.; Sidorko, V. R.

doi:10.4028/3-908451-49-3.181

Cited by 4 publications

(10 citation statements)

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“…From Table 4, it is seen that the listed values of activation energies are directly dependent on the boriding method and also on the mathematical formulation of different approaches [9,17,19] employed to extract the values of boron activation energies from the calculations of boron diffusivities in iron borides. In the present work, the use of alternative diffusion model allowed us to get higher values of activation energies compared to other diffusion models [10,11,13] and the bilayer diffusion model. In fact, the expressions used to assess the boron diffusivities in FeB and Fe 2 B in the alternative diffusion model [9] contained two terms which are the natural logarithms of the two dimensionless parameters (Φ 1 and Φ 2 ) compared to other mathemtical models [10,11,13] and the bilayer diffusion model.…”

Section: Assessment Of Boron Activation Energiesmentioning

confidence: 83%

“…In the present work, the use of alternative diffusion model allowed us to get higher values of activation energies compared to other diffusion models [10,11,13] and the bilayer diffusion model. In fact, the expressions used to assess the boron diffusivities in FeB and Fe 2 B in the alternative diffusion model [9] contained two terms which are the natural logarithms of the two dimensionless parameters (Φ 1 and Φ 2 ) compared to other mathemtical models [10,11,13] and the bilayer diffusion model. In this work, the calculated activation energies in FeB and Fe 2 B were found to be comparable when using the following diffusion models [10,11,13] and the present bilayer diffusion model.…”

Section: Assessment Of Boron Activation Energiesmentioning

confidence: 83%

“…The constant g = 0.60 denotes the molar volume ratio of the FeB and Fe 2 B phases. The constants p = q = = r = 1 and s = 2 designate the stoichiometric coefficients of FeB and Fe 2 B [13]. Therefore, the layers'thicknesses of FeB and Fe 2 B can be estimated by using the Runge-Kutta method [16] for the given boriding parameters.…”

Section: The Dybkov Modelmentioning

confidence: 99%

“…In terms of kinetic modelling of boriding process, a certain number of mathematical models was implemented and dedicated to the growth of FeB and Fe 2 B layers on some steels [7][8][9][10][11][12][13]. In the following mathematical models [7][8][9][10]12], the boride incubation periods were considered during the growth of both phases.…”

Section: Introductionmentioning

confidence: 99%

“…For predicting the boriding kinetics of AIS 316 steel, the mean values of these two parameters were then considered to solve this diffusion problem. Keddam and Jurci [10] proposed two different approaches (the integral diffusion model and a modified version of the Dybkov model [13] with the inclusion of boride incubation periods) for the bilayer growth (FeB/Fe 2 B) onto the AISI M2 steel. Finally, Nait Abdelah et al [11] suggested a numerical treatment regarding the boriding kinetics of AISI H13 steel by employing the mean diffusion coefficient (MDC) method and ignoring the incubation periods for the formation of iron boride layers.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Prediction models for the kinetics of iron boride layers on AISI 316L steel

Mansour

Кеддам

Boumaali

2022

Koroze a Ochrana Materialu

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The boronizing kinetics of AISI 316L steel has been analyzed by employing five prediction models. The boron diffusion coefficients as well as the growth rate constants in the FeB and Fe2B phases were firstly evaluated in the range of 1123-1223 K. Afterwards, the values of boron activation energies in FeB and Fe2B were secondly deduced by adopting the Arrhenius relationships.In addition, the prediction models have been validated experimentally for two boronizing conditions (1170 K for 1.6 h and 1210 K for 1.1 h). The predicted results were deemed very concordant with the experiments. Furthermore, advantages and limitations about the applicability of these models were also discussed.

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Section: Assessment Of Boron Activation Energiesmentioning

confidence: 83%

Section: Assessment Of Boron Activation Energiesmentioning

confidence: 83%

Section: The Dybkov Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Prediction models for the kinetics of iron boride layers on AISI 316L steel

Mansour

Кеддам

Boumaali

2022

Koroze a Ochrana Materialu

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Kinetics of borided gear steels

Güneş

2013

Sadhana

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In this study, the case properties and diffusion kinetics of GS18NiMoCr36 (GS18), GS22NiMoCr56 (GS22) and GS32NiCrMo6.4 (GS32) gear steels borided in Ekabor-II powder were investigated by conducting a series of experiments at temperatures of 1123, 1173 and 1223 K for 2, 4 and 6 h. The boride layer was characterized by optical microscopy, X-ray diffraction technique and micro-Vickers hardness tester. X-ray diffraction analysis of boride layers on the surface of the steels revealed the existence of FeB, Fe 2 B, CrB and Cr 2 B compounds. The thickness of the boride layer increases by increasing boriding time and temperature for all steels. The hardness of the boride compounds formed on the surface of the steels GS18, GS22 and GS32 ranged from 1624 to 1905 HV 0,05 , 1702 to 1948 HV 0,05 , and 1745 to 2034 HV 0,05 respectively, whereas Vickers hardness values of the untreated steels GS18, GS22 and GS32 were 335 HV 0,05 , 358 HV 0,05 and 411 HV 0,05 , respectively. The activation energies (Q) of borided steels were 228.644 kJ/mol for GS18, 280.609 kJ/mol for GS22 and 294.359 kJ/mol for GS32. The growth kinetics of the boride layers forming on the GS18, GS22 and GS32 steels and the thickness of boride layers were also investigated.

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Growth kinetics and abrasive wear resistance of boride layers on Fe–15Cr alloy

Dybkov

Goncharuk

Khoruzha

et al. 2011

Materials Science and Technology

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Two boride layers based on the FeB and Fe 2 B compounds are formed at the interface between an Fe-15Cr alloy and boron at 850-950uC and reaction times up to 12 h, with the average chromium content being around 8 at-% in the former and 12 at-% in the latter. Both boride layers reveal a pronounced texture. Diffusional growth kinetics of the layers are close to parabolic and can alternatively be described by a system of two non-linear differential equations. Microhardness values are 17?4 GPa for the FeB layer, 14?4 GPa for the Fe 2 B layer and 0?95 GPa for the Fe-15Cr alloy base. The dry abrasive wear resistance of borided alloy samples is around 45 times greater than that of non-borided ones.

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Diffusional Growth Kinetics of Boride Layers on Iron-Chromium Alloys

Cited by 4 publications

References 0 publications

Prediction models for the kinetics of iron boride layers on AISI 316L steel

Prediction models for the kinetics of iron boride layers on AISI 316L steel

Kinetics of borided gear steels

Growth kinetics and abrasive wear resistance of boride layers on Fe–15Cr alloy

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