Abstract
Abstract In this work, a gray cast iron containing copper of grade EN-GJL-250 was pack-borided within the temperature range of 800°C–1,000°C with treatment times of 2–6 h. According to the X-ray diffraction analysis, the Fe2B phase has been identified over the surface of this material and the boride layer has an average thickness between 20.8 ± 2.9 and 149.1 ± 10.2 µm. The morphological aspect of the Fe2B layer was investigated with a scanning electron microscope. The regression model based on the ANOVA analysis has been established to investigate the growth kinetics of boride layers on EN-GJL-250 gray cast iron. The boron activation energies in the EN-GJL-250 cast iron were estimated as 148.03 and 147.96 kJ mol−1 by the parabolic growth law and the mean diffusion coefficient method, respectively. Furthermore, the experimental Fe2B layers’ thicknesses were in accord with the predicted values given by the regression model and the MDC method.
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