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Microstructural Study of as-cast Fe-Si Alloys. Effect of Percentage of Silicon

Published online by Cambridge University Press:  31 January 2012

María G. González F. ,
José A. García H. ,
A. Balandra  and
V. Aranda.
María G. González F.
Affiliation:
Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n Coyoacán, 04510 México, D. F. Email: hajpu@yahoo.com.mx
José A. García H.
Affiliation:
Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n Coyoacán, 04510 México, D. F. Email: hajpu@yahoo.com.mx
A. Balandra
Affiliation:
Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n Coyoacán, 04510 México, D. F. Email: hajpu@yahoo.com.mx
V. Aranda.
Affiliation:
Departamento de Ingeniería Metalúrgica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria s/n Coyoacán, 04510 México, D. F. Email: hajpu@yahoo.com.mx
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Abstract

Silicon steels are materials used in construction of electric motors and transformers. Silicon is an effective element to improve the electrical and magnetic properties. During the solidification stage is defined the distribution of solute on the solid as segregation or coring. This paper researched the effect of the percentage of silicon on the microstructure and segregation profiles of the Fe-0.5wt%Si, Fe-1.5wt%Si and Fe-3wt%Si cast alloys. The samples were metallographically prepared by conventional techniques. The concentration of silicon in grain boundary regions was carried out by scanning electron microscopy (SEM) with EDS-WDS microanalysis, the morphological changes of the grain as a function of silicon was evaluated by optical microscopy. Experimental microsegregation patterns showed significant difference from the Scheil model and greater agreement with this model when considering convective-diffusive conditions. The microstructural study revealed discrepancies with the solidification pattern governed by the solidification interval.

Keywords

MicrostructureSteelGrain SizeCastingScanning Electron Microscopy (SEM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1372: Symposium S3 – Structural and Chemical Characterization of Metal Alloys and Compounds—2011 , 2012 , imrc-1372-s3-p88
Copyright
Copyright © Materials Research Society 2012

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References

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