Modelling the formation kinetics of Fe2B layers with a diffusionmodel using taylor expansion
DOI:
https://doi.org/10.62638/ZasMat1252Ključne reči:
BORIDING, iron boride, Diffusion model , Boron activation energyApstrakt
This work aimed to model the growth kinetics of Fe2B layers on the DIN 1.2738 steel by using a novel kinetic approach. The proposed model considered the transient diffusion regime of boron atoms through the surface of treated steel. The distribution of boron atoms across the Fe2B layer was expressed as a Taylor expansion of second order. Afterward, the boron activation energy in the Fe2B layers was assessed as equal to 214.48 kJmol-1 in the temperature range 1123-1223 K using the experimental results taken from the literature. Finally, the present model has been validated experimentally by using additional boriding conditions (1198 K for 4.5 h). The experimental Fe2B layer thickness obtained at 1198 K for 4.5 h aligned with the predicted value provided by the model. Furthermore, the mass gain per unit area resulting from the formation of Fe2B layer was also calculated as a function of processing parameters.
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