Indian Journal of Engineering & Materials Sciences

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Growth kinetics of Fe2B layers formed on the AISI 4150 steel by different approaches


Affiliations
1 Autonomous University of Hidalgo State, Escuela Superior de Ciudad Sahagún-Mechanical Engineering, Carretera Cd. Sahagún-O tumba s/n, Zona Industrial CP. 43990, Hidalgo, Mexico
2 Laboratory of Materials Technology, Faculty of Mechanical Engineering and Process Engineering, USTHB, B.P. No. 32, 16111 El-Alia, Bab-Ezzouar, Algiers,, Algeria
3 Monterrey Institute of Technology and Higher Education-ITESM Campus Santa Fe, Av. Carlos Lazo No. 100, Del. Álvaro Obregón, CP. 01389, México City, México., Mexico
4 Materials and Metallurgy Research Center, Autonomous University of Hidalgo State, Ciudad Universitaria Pachuca-Tulancingo km. 4.5, Pachuca, Hidalgo,, Mexico
5 Ibero-American University of Mexico City, Department of Physics and Mathematics, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, CP. 01219, México City, Mexico
6 Ibero-American University of Mexico City, Department of Physics and Mathematics, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, CP. 01219, México City,, Mexico

In the present work, the AISI 4150 steel has been pack-borided in the temperature range of 1123-1273 K for a treatment time of 2 to 8 h. The mixture of powders containing 20% B4C, 10% KBF4 and 70% SiC has been used for producing a single boride layer (Fe2B) at the surface of AISI 4150 steel. The presence of Fe2B phase has been confirmed by XRD analysis. The SEM observations have been done to investigate the morphology of boride layers and measure their thicknesses. The cohesion of boride layers has been evaluated by using the Daimler-Benz Rockwell-C indentation technique. The borided sample at 1173 K for 8 h has shown a best cohesion of boride layer to the substrate in comparison to the sample treated at 1173 K during 2 h. Kinetically, different approaches have been used to estimate the boron diffusion coefficients in the Fe2B layers and to predict the value of Fe2B layer thickness obtained at 1253 K for a treatment time of 2.5 h. The estimated values of activation energies for boron diffusion in AISI 4150 steel have been in the range of 193.45 to 199.74 kJ mol-1. These values of activation energies have been depended on the diffusion models used. In addition, a good agreement has been observed between the experimental value of Fe2B layer thickness obtained at 1253 K for 2.5 h with the predicted values from these different diffusion models.
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  • Growth kinetics of Fe2B layers formed on the AISI 4150 steel by different approaches

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Authors

Jorge Zuno-Silva
Autonomous University of Hidalgo State, Escuela Superior de Ciudad Sahagún-Mechanical Engineering, Carretera Cd. Sahagún-O tumba s/n, Zona Industrial CP. 43990, Hidalgo, Mexico
Mourad Keddam
Laboratory of Materials Technology, Faculty of Mechanical Engineering and Process Engineering, USTHB, B.P. No. 32, 16111 El-Alia, Bab-Ezzouar, Algiers,, Algeria
Martin Ortiz-Domínguez
Autonomous University of Hidalgo State, Escuela Superior de Ciudad Sahagún-Mechanical Engineering, Carretera Cd. Sahagún-O tumba s/n, Zona Industrial CP. 43990, Hidalgo, Mexico
Milton Elias- Espinosa
Monterrey Institute of Technology and Higher Education-ITESM Campus Santa Fe, Av. Carlos Lazo No. 100, Del. Álvaro Obregón, CP. 01389, México City, México., Mexico
Alberto Arenas-Flores
Materials and Metallurgy Research Center, Autonomous University of Hidalgo State, Ciudad Universitaria Pachuca-Tulancingo km. 4.5, Pachuca, Hidalgo,, Mexico
Felipe Cervantes-Sodi
Ibero-American University of Mexico City, Department of Physics and Mathematics, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, CP. 01219, México City, Mexico
José Angel Reyes-Retanac
Ibero-American University of Mexico City, Department of Physics and Mathematics, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, CP. 01219, México City,, Mexico

Abstract


In the present work, the AISI 4150 steel has been pack-borided in the temperature range of 1123-1273 K for a treatment time of 2 to 8 h. The mixture of powders containing 20% B4C, 10% KBF4 and 70% SiC has been used for producing a single boride layer (Fe2B) at the surface of AISI 4150 steel. The presence of Fe2B phase has been confirmed by XRD analysis. The SEM observations have been done to investigate the morphology of boride layers and measure their thicknesses. The cohesion of boride layers has been evaluated by using the Daimler-Benz Rockwell-C indentation technique. The borided sample at 1173 K for 8 h has shown a best cohesion of boride layer to the substrate in comparison to the sample treated at 1173 K during 2 h. Kinetically, different approaches have been used to estimate the boron diffusion coefficients in the Fe2B layers and to predict the value of Fe2B layer thickness obtained at 1253 K for a treatment time of 2.5 h. The estimated values of activation energies for boron diffusion in AISI 4150 steel have been in the range of 193.45 to 199.74 kJ mol-1. These values of activation energies have been depended on the diffusion models used. In addition, a good agreement has been observed between the experimental value of Fe2B layer thickness obtained at 1253 K for 2.5 h with the predicted values from these different diffusion models.