Extracción electroquímica de carburos de microaleación en Nb-acero

A. L. Rivas; E. Vidal; D. K. Matlock; J. G. Speer

doi:10.3989/revmetalm.0771

Authors

A. L. Rivas Universidad Simón Bolivar. Dpto. Ciencia de los Materiales
E. Vidal Kroll Institute for ExtractiveMetallurgy, Colorado School of Mines
D. K. Matlock Advanced Steel Processing and Product Research Center, Colorado School of Mines
J. G. Speer Advanced Steel Processing and Product Research Center, Colorado School of Mines

DOI:

https://doi.org/10.3989/revmetalm.0771

Keywords:

(Nb, Ti)C precipitates, Electrochemical extraction, Steel matrix dissolution, Microalloyed steel, Anodic dissolution, Filtration

Abstract

An electrochemical extraction technique was evaluated as a characterization method of precipitates in microalloyed steels. To carry out this study, a fully precipitated Nb-modified SAE 8620, was used. The investigation was accomplished by varying the electrolyte composition and the filter pore sizes used to collect the particles. The quantification of Nb was performed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Microscopy examination was also performed on extraction replicas and on residues collected in the acetate filters. Additionally, X-ray diffraction analysis (XRD) on the collected residues containing the precipitates was accomplished. The results showed that the dissolution rate is faster in the electrolyte consisting of 10 vol% HCl in water. Additionally, transmission electron microscopy (TEM) analysis along with chemical analysis by ICP-AES, showed that (Nb,Ti)C particles were collected in acetate filters with a pore size much larger than the precipitate size.

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