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Kinetic Study of the Growth of Hard Layers on a Low Carbon Steel

Published online by Cambridge University Press:  05 September 2017

Daniel S. Huerta ,
E.D. García Bustos ,
D.V. Melo Máximo  and
M. Flores Martinez
Daniel S. Huerta*
Affiliation:
CBI Posgrado Ciencia e Ingeniería de Materiales, Universidad Autónoma Metropolitana Plantel Azcapotzalco.
E.D. García Bustos
Affiliation:
CUCEI, Universidad de Guadalajara, Jalisco, Guadalajara, Posgrado de Materiales, Edificio H- Segundo piso-C. 07.
D.V. Melo Máximo
Affiliation:
Tecnológico de Estudios Superiores de Monterrey, carretera Lago de Guadalupe Km. 3.5 Atizapán de Zaragoza, Col. Margarita Maza de Juárez, Atizapán de Zaragoza.
M. Flores Martinez
Affiliation:
CUCEI, Universidad de Guadalajara, Jalisco, Guadalajara, Posgrado de Materiales, Edificio H- Segundo piso-C. 07.
*
*Email: [email protected]
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Abstract

In the present work the kinetic growth is analyzed for a hard coating applied on a low carbon steel AISI 8620. A thermochemical treatment of bored with dehydrated paste at temperatures of 900, 950 and 1000 °C with a residence time of 2, 4, 6 and 8 h. The morphology and types of borides formed on the surface of the steel were evaluated by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The layer formed has a size of 20 to 113 μm which will be dependent on the process temperature, the treatment time and the alloy elements of the substrate. Hardness of 1493-1852 HV are presented for treatment times and temperatures established in this study. The kinetics of growth were determined and analyzed using a mathematical model of diffusion, evaluating the penetration of the biphasic layer that is determined as a function of the time and temperature of the thermochemical treatment (TCT). The results show the increase in the growth constants (k) with respect to the bored temperatures. The activity energy (Q) of the material AISI 8620 was also obtained.

Keywords

KineticsSteelDiffusion
Type
Articles
Information
MRS Advances , Volume 2 , Issue 50: International Materials Research Congress XXV , 2017 , pp. 2809 - 2817
Copyright
Copyright © Materials Research Society 2017 

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References

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