Chemistry Reference
In-Depth Information
the corrections given in Chapter 7 should be applied to obtain integrated intensities
equivalent to the value from the Bragg-Brentano geometry.
The integrated intensities of each phase can also be obtained by area integration
over the defined regions for each peak. Then, the reflection factors should be
determined experimentally by measuring samples with a known percentage of
retained austenite (and carbide). The number of samples with different percentages
of retained austenite for calibration should be the same or more than the number
of reflection factors to be determined. Calibration by experimental method is
especially preferred for the integrated intensity determined by area integration. The
“reflection factors” determined experimentally contain all the instrument factors or
corrections. No further correction is necessary as long as the instrument condition and
the integration regions are the same. The maximum integrated area for each phase
can be used as long as it is consistent with the calibration. Background subtraction
may be avoided if a low noise photon-counting detector is used.
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