Journal
JOURNAL OF MINING AND METALLURGY SECTION B-METALLURGY
Volume 51, Issue 1, Pages 49-54Publisher
TECHNICAL FACULTY, BOR-SERBIA
DOI: 10.2298/JMMB140404009A
Keywords
Boriding; Diffusion; Iron borides; Kinetics; Activation energy; Regression model
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In this work, the kinetics of the boride layers (FeB/Fe2B), formed on the X200CrMoV12 steel used for the cold-working, was investigated. The bonding treatment was carried out in the powder mixture consisting of 5%B4C, 5% NaBF4, and 90% SiC. The bonding parameters are : 900, 950 and 1000 degrees C with treatment times of 2, 4 and 6 h. The obtained bonded 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 bonded 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 bonding 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.
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