A study of Sensitization in Types 301 and 304L Stainless Steels Using Mossbauer Spectroscopy
LOUISIANA STATE UNIV BATON ROUGE
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A relatively new research tool has been brought to bear on a relatively old problem. Mossbauer effect spectroscopy in conjunction with x-ray diffraction techniques were used to study the phenomenon of stainless steel sensitization. A ferromagnetic phase, thought to be pseudomartensite, has been found to exist in sensitized Type 301. Stresses generated in the matrix by morphology changes of the precipitated carbides is deemed responsible for the creation of this phase. No such phase was detected in the Type 304L. It was confirmed that the precipitated carbides were of the complex type Cr,Fe23C6. Furthermore, it was established that these carbides are paramagnetic. In the presence of austenite, the Mossbauer peak for the carbides is overshadowed. In single phase materials grain size has no effect on the Mossbauer spectrum. In multi-phase materials the peak locations are unaffected by grain size, but quantitative evaluations are influenced.
- Metallurgy and Metallography
- Atomic and Molecular Physics and Spectroscopy
- Nuclear Physics and Elementary Particle Physics