Determination of the Diffusion Coefficients of Boron in the FeB and Fe2B Layers Formed on AISI D2 Steel
M. Keddama, Z. Nait Abdellaha,b, M. Kulka c and R. Chegroune a
aLaboratoire de Technologie des Matériaux, Département de Sciences des Matériaux, Faculté de Génie Mécanique et Génie des Procédés, USTHB, B.P. No. 32, 16111, El-Alia, Bab-Ezzouar, Algiers, Algeria
bDépartement de Chimie, Faculté des Sciences, Université Mouloud Mammeri, 15000 Tizi-Ouzou, Algeria
cPoznań University of Technology, Institute of Materials Science and Engineering, pl. M. Skłodowskiej-Curie 5, 60-965 Poznań, Poland
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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.

DOI: 10.12693/APhysPolA.128.740
PACS numbers: 81.15.Aa, 68.55.A-, 68.47.De, 68.55.jd