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The Effect of Temperature and Time on the Formation of a Reaction Interlayer During Aluminizing of a Carbon Steel

Published online by Cambridge University Press:  01 February 2011

R. Torres ,
V.H. López ,
J.P. Arredondo ,
R. García ,
J.A. Verduzco  and
M.L. Mondragón
R. Torres
Affiliation:
Facultad de Ingeniería Mecánica, UMSNH, Morelia, Mich., México.
V.H. López
Affiliation:
Instituto de Investigaciones Metalúrgicas, UMSNH, P.O. Box 888, Morelia, Mich., 58000, México. E-mail; [email protected]
J.P. Arredondo
Affiliation:
Facultad de Ingeniería Mecánica, UMSNH, Morelia, Mich., México.
R. García
Affiliation:
Instituto de Investigaciones Metalúrgicas, UMSNH, P.O. Box 888, Morelia, Mich., 58000, México. E-mail; [email protected]
J.A. Verduzco
Affiliation:
Instituto de Investigaciones Metalúrgicas, UMSNH, P.O. Box 888, Morelia, Mich., 58000, México. E-mail; [email protected]
M.L. Mondragón
Affiliation:
Instituto Tecnológico de Morelia, Morelia, Mich., México.
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Abstract

A kinetic study was performed on the growth of a reaction interlayer between molten Al and carbon steel substrates at temperatures between 665 to 820°C by holding Al/flux/steel assemblies, in a tube furnace, at temperature for times up to 120 min. An Ar atmosphere and a K-Al-F based flux were used to enable spreading of molten Al on the steel substrates. Chemical and microstructural characterization of the samples revealed that the interlayer is composed of FeAl3 and Fe2Al5, being the second phase significantly thicker. The Fe2Al5 phase grows toward the steel with a tongue like morphology. Isothermal growth profiles of the reaction interlayer followed a parabolic behavior, meaning that at the beginning the reaction is very rapid and once that a continuous interlayer is formed the growth of the interlayer is controlled by interdifussion of species across the interlayer.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1242: Symposium 4 – Materials Characterization , 2009 , S4-24
Copyright
Copyright © Materials Research Society 2010

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References

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