Abstract
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.
Highlights
Surface treatments are often a technical-economic solution to solve materials problems[1]
We numerically study the thermochemical boronizing of the XC38 steel dipped into a salt bath (70% borax 30% of silicon carbide) at temperatures between 850° C to 1050° C for 2, 4 and 6 hours[15]
We developed a mathematical model based on the second law of Fick to simulate the incubation time of the Fe2B boronized layer formation obtained by boronizing the XC38 steel
Summary
Surface treatments are often a technical-economic solution to solve materials problems[1]. Different processes are applied to treat the metals surfaces. They are related to the chemical composition and mechanical properties of the metal[1,2]. Boronizing steels is a thermochemical treatment to improve the hardness (>1600 HV), the resistance to adhesive and abrasive wear and resistance to attack by acids and molten metals[3]. Boronizing is a boron diffusion process in steel or other metals, generally performed between 850°C and 1050°C4,5. There are three kinds of sources that provide the boron integrated in the substratum, solid (powder or paste), liquid (with or without electrolysis) and gaseous boron-rich atmospheres[1,2,3,4,5,6]. In industrial applications the gaseous boronizing method requires complex equipment[1]
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