Title: Modelling the growth of Fe₂B layers obtained by the paste boriding process in AISI 1018 steel

Authors: I. Campos-Silva, M. Ortiz-Dominguez

Addresses: Instituto Politecnico Nacional, Grupo Ingenieria de Superficies, SEPI-ESIME U.P. Adolfo Lopez Mateos, Zacatenco, Mexico D.F. 07738, Mexico. ' Instituto Politecnico Nacional, Grupo Ingenieria de Superficies, SEPI-ESIME U.P. Adolfo Lopez Mateos, Zacatenco, Mexico D.F. 07738, Mexico.

Abstract: This study evaluated the growth kinetics of Fe₂B hard coatings obtained by the paste boriding process at the surface of AISI 1018 steels. The treatment was carried out at temperatures of 1123, 1173, 1223 and 1273 K with different exposure times for each temperature using a 4 mm thick layer of boron carbide paste over the material surface. The boron diffusion coefficient was determined by the mass balance equation at the Fe₂B/substrate interface, assuming that the growth of Fe₂B layers obey the parabolic growth law. Likewise, the growth constant was related as a function of the boride incubation time, the boron surface content and the boron diffusion coefficient, in order to estimate the weight gain in the borided samples and the instantaneous velocity of the Fe₂B/substrate interface.

Keywords: paste boriding; boride layers; growth kinetics; diffusion modelling; materials properties; hard iron boride; Fe2B coatings; AISI 1018 steels.

DOI: 10.1504/IJMMP.2010.032499

International Journal of Microstructure and Materials Properties, 2010 Vol.5 No.1, pp.26 - 38

Published online: 04 Apr 2010 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article