PHASES AND STRESSES IN FERROUS METALS BY MOESSBAUER SPECTROSCOPY.

The major phases of iron yield distinct spectra: ferrite has six widely spaced lines, iron carbide has six lines less widely spaced, and austenite yields a single line. Corrosion products, too, can be identified. The effect of stress in the magnitudes normally encountered is subtle-the center of the pattern and the magnitude of the splitting change slightly. Block diagram of a Moessbauer spectrometer is reported.