Dybkov model for the estimation of boron diffusion in the FeB/Fe2B bilayer on AISI 316 steel

Abstract

The aim of this work is to apply three models to simulate the boron diffusion in AISI 316 steel, with an approach based on classical mass balance equations, the Dybkov model and the integral method. From the numerical solutions of both models, the predicted values of thickness have been compared to the experimental results. In addition, in order to improve the predictability of the two models, it is necessary to find precise measurements on the diffusion of boron in each phase. The comparison of experimental and theoretical results allows us to confirm the validity of both models. After validation, the root mean square error and the diffusion coefficient were calculated to achieve good performance and better accuracy. The comparison of the results from the two simulation models with confronted with the experimental data to verify the validity of this theoretical study. Finally, the comparison of the derived results gave the values of the root mean square error equal to 1.6μm for Fe2B and 0.75μm for FeB.

Keywords

• boriding, diffusion, iron borides, dybkov model, integral method