SIMULATION MODEL OF THE GROWTH KINETICS OF Fe₂B LAYERS WITH CONSIDERATION OF THE BORIDE INCUBATION TIME EFFECT

Abstract

In this work, a mathematical model for simulating the thermochemical boronizing process is presented. The diffusion model used in this paper is based on Fick’s laws by solving the mass balance equation of the (FeB/Fe2B) interface. In this developed model, the effect of boride incubation times during the formation of Fe2B layers on Armco iron was considered. To demonstrate the validity of our calculations, the simulation results are compared with experimentally obtained data on borided Armco iron, which allowed us to verify the validity of the model. Therefore, a good concordance was observed when comparing the experimental parabolic growth constants taken from the literature with our simulated values of the parabolic growth constants from the present diffusion model. From this study, it has been found that the incubation time has a very important influence on the evolution of the kinetics of the boride layers.

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

“…Very hard layers of iron borides (FeB, Fe 2 B) are formed on the surface of these materials [1,2]. FeB is harder than Fe 2 B, but it is more brittle and more easily fractured duringimpact [1,2,20]. The structures of FeB and Fe 2 B were known to be interstitial, FeB is orthorhombic and Fe 2 Bphase crystallizes ina bodycentered tetragonal structure [21].…”

Diffusion Model for Simulating the Kinetics of Boronizing Process in the Case of FeB/Fe2B Bilayer Configuration

“…This model takes also into account the incubation times during the formation of boronized layers. A diffusion model was proposed by Mebarek et al [15] in order to calculate the boride incubation time. Campos et al [16], Mebarek et al and Genel et al [9][10][11][12][13][14][15][16][17] applied the artificial intelligent method for modeling the boronizing kinetics.…”