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Matrix Effects in the Energy Dispersive X-Ray Analysis of CaO-Al2O3-MgO Inclusions in Steel

Published online by Cambridge University Press:  04 November 2011

Petrus Christiaan Pistorius  and
Neerav Verma
Petrus Christiaan Pistorius*
Affiliation:
Carnegie Mellon University, Department of Materials Science and Engineering, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
Neerav Verma
Affiliation:
Carnegie Mellon University, Department of Materials Science and Engineering, 5000 Forbes Avenue, Pittsburgh, PA 15213, USA
*
Corresponding author. E-mail: pistorius@cmu.edu
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Abstract

Energy dispersive X-ray microanalysis of micron-sized inclusions in steel is of considerable industrial importance. Measured spectra and Monte Carlo simulations show a significant effect of the steel matrix on analysis of CaO-Al2O3-MgO inclusions: the steel matrix filters the softer (Al and Mg) characteristic X-rays, increasing the relative height of the Ca peak. Bulk matrix correction methods would not result in correct inclusion compositions, but operating at a lower acceleration voltage shifts the effect to smaller inclusion sizes.

Keywords

energy dispersive X-ray (EDX)scanning electron microscope (SEM)steelinclusionsMonte Carlosimulation
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 17 , Issue 6 , December 2011 , pp. 963 - 971
Copyright
Copyright © Microscopy Society of America 2011

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