TY - JOUR
T1 - Kinetics of the formation of Fe 2 B layers in gray cast iron
T2 - Effects of boron concentration and boride incubation time
AU - Campos-Silva, I.
AU - Ortiz-Domínguez, M.
AU - Keddam, M.
AU - López-Perrusquia, N.
AU - Carmona-Vargas, A.
AU - Elías-Espinosa, M.
PY - 2009/8/30
Y1 - 2009/8/30
N2 - The growth kinetics of Fe 2 B layers formed at the surface of gray cast iron were evaluated in this study. The pack-boriding process was applied to produce the Fe 2 B phase at the material surface, and the variables included three temperatures (1173, 1223 and 1273 K) and four exposure times (2, 4, 6 and 8 h). Taking into account the growth fronts obtained at the surface of the material and the mass balance equation at the Fe 2 B/substrate interface, the boron diffusion coefficient on the borided phase was estimated for the range of treatment temperatures. Likewise the parabolic growth constant, the instantaneous velocity of the Fe 2 B/substrate interface, and the weight gain in the borided samples were established as a function of the parameters τ(t) and α(C), which are related to the boride incubation time (t 0 (T)) and boron concentration at the Fe 2 B phase, respectively. Observation of the growth kinetics of the Fe 2 B layers in gray cast irons suggest an optimum value of boron concentration that is in good agreement with the set of boriding experimental conditions used in this work.
AB - The growth kinetics of Fe 2 B layers formed at the surface of gray cast iron were evaluated in this study. The pack-boriding process was applied to produce the Fe 2 B phase at the material surface, and the variables included three temperatures (1173, 1223 and 1273 K) and four exposure times (2, 4, 6 and 8 h). Taking into account the growth fronts obtained at the surface of the material and the mass balance equation at the Fe 2 B/substrate interface, the boron diffusion coefficient on the borided phase was estimated for the range of treatment temperatures. Likewise the parabolic growth constant, the instantaneous velocity of the Fe 2 B/substrate interface, and the weight gain in the borided samples were established as a function of the parameters τ(t) and α(C), which are related to the boride incubation time (t 0 (T)) and boron concentration at the Fe 2 B phase, respectively. Observation of the growth kinetics of the Fe 2 B layers in gray cast irons suggest an optimum value of boron concentration that is in good agreement with the set of boriding experimental conditions used in this work.
KW - Boride incubation time
KW - Boride layers
KW - Boron concentration
KW - Diffusion model
KW - Growth kinetics
KW - Pack boriding
UR - http://www.scopus.com/inward/record.url?scp=68949164735&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2009.07.029
DO - 10.1016/j.apsusc.2009.07.029
M3 - Artículo
SN - 0169-4332
VL - 255
SP - 9290
EP - 9295
JO - Applied Surface Science
JF - Applied Surface Science
IS - 22
ER -