The Study of Retained Austenite by Means of Mössbauer Scattering Spectroscopy
The applications of Mössbauer spectroscopy to material research are reported for phase identification, structure analysis, and quantitative measurements. In certain aspects, this method is superior to the conventional x-ray diffraction technique since it provides some information on interactions at the nuclear sites of a particular element in the solids. Moreover, the measurement of Mössbauer scattering spectra permits nondestructive analyses of the irregular surfaces of the bulk specimens. Austenite is the paramagnetic phase of iron with a face-centered cubic structure which appears as a singlet peak to the Mössbauer spectrum. However, the quadrupole interaction may be observed due to the deformation of p-electron distribution by the influence of interstitial solvent atoms such as carbon. Possible interference in the analysis could occur when austenite coexists with appreciable amounts of paramagnetic iron-containing carbides. Quantitative analysis of retained austenite can be achieved.
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