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In this work, the kinetics of formation of the boride layers (FeB/Fe2B),   formed on the X200CrMoV12 steel used for the coldworking, was investigated.   The boriding treatment was carried out in the powder mixture consisting of   5%B4C, 5% NaBF4 and 90% SiC. The boriding parameters are : 900, 950 and   1000°C with treatment times of 2, 4 and 6 h. The obtained borided layers   (FeB/Fe2B) were characterized by the following experimental techniques:   optical microscopy, scanning electron microscopy coupled to EDS analysis and   XRD analysis. The kinetics of boron diffusion in the X200CrMoV12 steel was   also studied. As a result, the time dependence of the borided layers   thicknesses followed a growth parabolic law. The boron activation energy was   estimated as 199.37 kJ mol-1 for the X200CrMoV12 steel. A full factorial   design with 2 factors at 3 levels was employed to estimate the total boride   layer thickness as a function of the boriding parameters (time and   temperature) and a simple equation was proposed. Finally, an iso-thickness   diagram was given as a tool to predict the total boride layers thicknesses in   relation with the practical utilization of this kind of steel

Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel