A Simple Kinetic Model for the Growth of FeB2 Layers on AISI 1026 Steel During the Powder-pack Boriding
Flores Rentería, Miguel Ángel
2015
M. A. Flores-Rentería, M. Ortiz-Domínguez, M. Keddam, O. Damián-Mejía, M. Elias-Espinosa, M. A. Flores-González, S. A. Medina-Moreno, A. Cruz-Avilés and M. Villanueva-Ibañez, (2015) A Simple Kinetic Model for the Growth of Fe2B Layers on AISI 1026 Steel During the Powder-pack Boriding, High Temperature Materials and Processes. 34(1), 1?11
Abstract
IThis work focused on the determination of boron diffusion coefficient through the FeB layers on AISI 1026 steel using a mathematical model. The suggested model solves the mass balance equation at the (Fe2B/substrate) interface. This thermochemical treatment was carried outin the temperature range of 1123?1273 K for a treatment time ranging from 2 to 8 h. The generated boride layers were characterized by different experimental techniques such as light optical microscopy, scanning electron microscopy, XRD analysis and the Daimler-Benz Rockwell-C indentation technique.As a result, the boron activation energy for AISI 1026 steel was estimated as 178.4 kJ/mol.Furthermore, this kinetic model was validated by comparing the experimental Fe2B layer thickness with the predicted one at a temperature of 1253K for 5 h of treatment.A contour diagram relating the layer thickness to the boriding parameters was proposed to be used in practical applications.
