Diffusional Growth Kinetics of Boride Layers on Iron-Chromium Alloys |
| Journal |
Solid State Phenomena (Volume 138) |
| Volume |
Solid Phase Transformations |
| Edited by |
J. Čermák and I. Stloukal |
| Pages |
181-188 |
| DOI |
10.4028/www.scientific.net/SSP.138.181 |
| Online since |
March, 2008 |
| Authors |
V.I. Dybkov,
L.V. Goncharuk,
V.G. Khoruzha,
K.A. Meleshevich,
A.V. Samelyuk,
V.R. Sidorko
|
| Keywords |
Boride Layers, Chemical Composition, Fe-Cr Alloys, Growth Kinetic, Phase Identity |
| Abstract |
Two boride layers were found to form at the interface of iiron-chromiium alllloys (10 and
25% Cr) or an industrial 13% Cr steel and boron at 850-950 oC and reaction times in the range 1-12
h. In the case of a Fe-10% Cr alloy and the steel, the layers are based on the FeB and Fe2B
compounds. With a Fe-25% Cr alloy, the constituent phases are FeB and CrB for the outer layer and
Fe2B and Cr2B for the inner layer. Both layers are characterized by a pronounced texture.
Diffusional growth kinetics of boride layers are close to parabolic and can alternatively be described
by a system of two non-linear differential equations, producing a good fit to the experimental data.
The temperature dependence of the layer growth-rate constants obeys a relation of the Arrhenius
type. |
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