Paper Title:
Dependence between the Boron Surface Concentration and the Growth Kinetics of Boride Layers in AISI 4140 Steels
  Abstract

The present work estimated the growth kinetics of Fe2B layers formed at the surface of AISI 4140 steels. The thermochemical treatment was applied in order to produce the Fe2B phase, considering temperatures of 1123, 1173, 1223 and 1273 K with five exposure times (2, 4, 5, 6, and 8 h), using a 4 mm thick layer of boron carbide paste over the material surface. The growth of boride layers was described by the mass balance equation between phases in thermodynamic equilibrium, assuming that the growth of boride layers obeys the parabolic growth equation and the boron concentration at the interfaces remains constant. Also, the boron diffusion coefficient at the Fe2B ( ) was established as a function of boriding temperature. Likewise, the parabolic growth constant (k), the instantaneous velocity (v) of the Fe2B/substrate interface and the weight-gain of borided steels were established as a function of the parameters and , which are related to the boride incubation time ( ) and boron surface concentration ( ), respectively.

  Info
Periodical
Defect and Diffusion Forum (Volumes 297-301)
Edited by
Andreas Öchsner, Graeme E. Murch, Ali Shokuhfar and João M.P.Q. Delgado
Pages
294-299
DOI
10.4028/www.scientific.net/DDF.297-301.294
Citation
M. Ortíz-Domínguez, I. Campos-Silva, J. Martínez-Trinidad, M. Elías-Espinosa, E. Hernández-Sánchez, D. Bravo-Bárcenas, "Dependence between the Boron Surface Concentration and the Growth Kinetics of Boride Layers in AISI 4140 Steels", Defect and Diffusion Forum, Vols. 297-301, pp. 294-299, 2010
Online since
April 2010
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