Abstract
In the present work, we study the growth kinetics of iron Fe2 B boride formed on stainless steel AISI 316L using a diffusion model based on the second Fick’s law and the mass balance equation. In this model, we use the thermodynamic properties of the Fe-B phase diagram, particularly in the temperature range 800–1100 ◦ C. The validation of this diffusion model was achieved by comparing the simulation results with the experimental data of a thermochemical boronizing in a liquid medium (70% borax 30% of silicon carbide) where the presence of Fe2 B boride formed on the surface of the steel substrate was confirmed by optical microscopy and MBE. Experimentally, the growth kinetics of the boride layers formed on the surface of the steel AISI 316 L is described by a parabolic relationship between the thickness of the layer and the processing time. In the temperature range from 800–1100 ◦ C, the deduced value of the activation energy of the boron is 174.6 kJ/mol. The simulation model we propose, can not only predict the thickness of the boride layer but also to calculate the concentration of boron in each phase. A fairly good agreement was observed between the results of numerical simulation and experimental data.
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