Diffusion kinetics of boron in the X200CrMoV12 high-alloy steel
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...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2015-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2015/1450-53391500009A.pdf |
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| Summary: | 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. |
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| ISSN: | 1450-5339 2217-7175 |