TY - JOUR
T1 - Growth kinetics of boride coatings formed at the surface AISI M2 during dehydrated paste pack boriding
AU - Doñu Ruiz, M. A.
AU - López Perrusquia, N.
AU - Sánchez Huerta, D.
AU - Torres San Miguel, C. R.
AU - Urriolagoitia Calderón, G. M.
AU - Cerillo Moreno, E. A.
AU - Cortes Suarez, J. V.
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - The growth kinetics of the boride coatings (FeB and Fe2B) at the surface of AISI M2 high speed steels were studied in this work. Boriding thermochemical treatment was carried out by dehydrated paste pack at three different temperatures 1173, 1223, and 1273 K and four exposure times 1, 3, 5, and 7 h, respectively. The presence of FeB and Fe2B phases was identified by scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction method. In order to obtain the boron diffusion coefficients at the FeB/Fe2B boride coatings, a mathematical model based on the mass balance at the growing interfaces was proposed under certain assumptions. Likewise the parabolic growth constants and the boride incubation time were established as a function of the parameters η (T) and ε (T). The activation energy values estimated for the FeB and Fe2B layers were 233.42 and 211.89 kJ mol- 1 respectively. A good agreement was obtained between the simulated values of boride layer thicknesses and the experimental results. Finally, empirical relationships of boride coating thickness as a function of boriding temperature and time are presented.
AB - The growth kinetics of the boride coatings (FeB and Fe2B) at the surface of AISI M2 high speed steels were studied in this work. Boriding thermochemical treatment was carried out by dehydrated paste pack at three different temperatures 1173, 1223, and 1273 K and four exposure times 1, 3, 5, and 7 h, respectively. The presence of FeB and Fe2B phases was identified by scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction method. In order to obtain the boron diffusion coefficients at the FeB/Fe2B boride coatings, a mathematical model based on the mass balance at the growing interfaces was proposed under certain assumptions. Likewise the parabolic growth constants and the boride incubation time were established as a function of the parameters η (T) and ε (T). The activation energy values estimated for the FeB and Fe2B layers were 233.42 and 211.89 kJ mol- 1 respectively. A good agreement was obtained between the simulated values of boride layer thicknesses and the experimental results. Finally, empirical relationships of boride coating thickness as a function of boriding temperature and time are presented.
KW - Boride coatings
KW - Boride incubation time
KW - Dehydrated paste
KW - Diffusion model
KW - Growth kinetics
UR - http://www.scopus.com/inward/record.url?scp=84940704805&partnerID=8YFLogxK
U2 - 10.1016/j.tsf.2015.07.086
DO - 10.1016/j.tsf.2015.07.086
M3 - Artículo
AN - SCOPUS:84940704805
SN - 0040-6090
VL - 596
SP - 147
EP - 154
JO - Thin Solid Films
JF - Thin Solid Films
ER -