Effect of Boride Incubation Time During the Formation of Fe2B Phase

Our present study focuses on the numerical simulation of the boronized layer growth kinetics on the iron substrate of the XC38 steel, the boronizing treatment is performed in a liquid medium composed of borax and silicon carbide. We mainly calculated the incubation time of the boronized layer formation. Aimed at estimating the boronizing treatment kinetics of XC38 steel, we initially used experimental data. The study was conducted to determine the law of borided layers growth and estimate the boron diffusion coefficient in the Fe2B layer. The diffusion coefficient obtained from this experiment is: D Fe 2 B = 1 . 388 × 10 − 4 exp − 207 . 8 × 10 3 j RT m 2 s − 1 In order to calculate the incubation time of the Fe2B layer, we adapted the mathematical model, which is based on the second law of Fick. This model takes into account the thermodynamic properties of the Fe-B phase diagram. The comparison of the results obtained by the simulation with those obtained experimentally verifies the validity of the theoretical study and a good agreement was obtained as well.

本研究聚焦于XC38钢铁基体上渗硼层生长动力学的数值模拟，渗硼处理采用由硼砂与碳化硅组成的液态介质开展。本研究主要计算了渗硼层形成的孕育期；为评估XC38钢的渗硼处理动力学特性，本研究初期采用了实验测得的数据。本研究旨在明确渗硼层的生长规律，并测定Fe₂B（Fe2B）层内的硼扩散系数，本实验所得扩散系数为：$D_{ ext{Fe}_2 ext{B}} = 1.388 imes 10^{-4} expleft( -frac{207.8 imes 10^3}{RT}
ight) ext{m}^2 cdot ext{s}^{-1}$。为计算Fe₂B层的孕育期，本研究采用了基于菲克第二定律的数学模型，该模型考虑了Fe-B相图的热力学特性。将模拟所得结果与实验结果进行对比后，验证了本理论研究的有效性，且二者具有良好的一致性。