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In this work, the effective diffusion coefficient of boron in the Fe 2 B phase was evaluated by considering the effect of chemical stresses in the case of paste-boriding of AISI 4140 steel. Two kinetic approaches were proposed to evaluate the diffusion coefficient of boron in the Fe 2 B phase in the temperature range of 1 123–1 273 K, and considering the effect of the boride incubation times. By applying the mass balance equation at the (Fe 2 B/substrate) interface and the theory of elasticity, it is possible to determine the effective diffusion coefficient of boron in the Fe 2 B phase. The obtained value of activation energy of boron diffusion in the presence of chemical stresses was estimated as 158.78 kJ mol −1  using the experimental parabolic growth constants taken from the literature. In addition, the simulated values of effective diffusion coefficients of boron in the Fe 2 B phase are found to be sensitive to the change in the boriding temperature and to the increase in the upper boron content in the Fe 2 B phase within its composition range

Evaluation of the effective diffusion coefficient of boron in the Fe 2 B phase in the presence of chemical stresses