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A Diffusion Model for the Fe_{2}B Layers Formed on a Ductile Cast Iron

100%
Keddam M.
Acta Physica Polonica A
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2018
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vol. 133
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issue 5
1174-1177
EN
In this work, a diffusion model was applied to estimate the boron diffusion coefficients in the Fe_{2}B layers on the ASTM A-536 ductile iron in the temperature range 1173-1273 K by the powder-pack boriding. The mass balance equation at the (Fe_{2}B/substrate) interface was formulated considering the effect of boride incubation times. As a result, the value of activation energy for boron diffusion in the ductile iron was estimated and compared with the literature. To verify the validity of the present model, the experimental Fe_{2}B layer thickness obtained at 1173 K for 10 h was compared to the predicted value. A good concordance was observed between the predicted value of Fe_{2}B layer thickness and the experimental data.
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Modelling the Boronizing Kinetics in AISI 316 Stainless Steel

51%
Nait Abdellah Z., Keddam M., Elias A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 3
588-592
EN
This work deals with the simulation of the growth kinetics of the (FeB/Fe_2B) bilayer and the diffusion zone on a substrate of AISI 316 stainless steel exposed to the powder-pack boriding process, in the temperature range of 1123-1273 K and a time duration ranging from 2 to 10 h. The developed diffusion model employs a set of mass balance equations at the three growth fronts: [(FeB/Fe_2B), (FeB/diffusion zone) and (diffusion zone/substrate)] under certain assumptions, including the effect of the incubation times during the formation of iron borides and the diffusion zone. For this purpose, a computer code written in Matlab (version 6.5) was created to simulate the boriding kinetics. A good concordance was obtained when comparing the experimental parabolic growth constants taken from the literature and the simulated values of the parabolic growth constants: (k_{FeB}, k_1 and k_2). Moreover, the present model was also used to predict the thicknesses of the FeB and Fe_2B layers and the diffusion zone thickness at various treatment times and boriding temperatures. The simulated values were in good agreement with the experimental borided layers thicknesses.
3
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Determination of the Diffusion Coefficients of Boron in the FeB and Fe₂B Layers Formed on AISI D2 Steel

51%
Keddam M., Nait Abdellah Z., Kulka M., Chegroune R.
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EN
In the present work, a diffusion model was applied to estimate the boron diffusion coefficients in the FeB and Fe₂B layers during the pack-boriding of AISI D2 steel in the temperature range of 1223-1323 K during a variable exposure time between 1 and 8 h. The mass balance equations were formulated at each growing interface by considering the effect of boride incubation times. The estimated values of boron activation energies in the FeB and Fe₂B layers were compared with the literature data. Validation of the present model was made by comparing the experimental thickness of each boride layer, taken from the literature data, with the predicted values. In addition, a simple equation was suggested to estimate the required time to obtain a single Fe₂B layer by diffusion annealing.
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