Modelling the growth of Fe₂B layers obtained by the paste boriding process in AISI 1018 steel
by I. Campos-Silva, M. Ortiz-Dominguez
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 5, No. 1, 2010

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.

Online publication date: Sun, 04-Apr-2010

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