Abstract
Mössbauer effect spectroscopy has been used to study changes in the microstructure of an Fe-1.22. wt pct C alloy due to tempering between 373 and 523 K. The orthorhombic transition carbide, η-Fe2C, was identified by transmission electron microscopy and the similarity of ∈-carbide electron diffraction patterns to η-carbide diffraction patterns is noted. Systematic changes in the Mosbauer parameters of martensite and austenite are presented for the various stages of tempering. The same amount of C remains randomly dissolved in the retained austenite throughout tempering and some C is retained in the martensite throughout the range of transition carbide formation. Two sets of Mössbauer parameters corresponding to magnetic phases other than martensite and cementite have been found. These parameters may come from η-carbide, but alternative interpretations are presented.
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An erratum to this article is available at http://dx.doi.org/10.1007/BF02700462.
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Williamson, D.L., Nakazawa, K. & Krauss, G. A study of the early stages of tempering in an Fe-1.2 Pct alloy. Metall Trans A 10, 1351–1363 (1979). https://doi.org/10.1007/BF02811991
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DOI: https://doi.org/10.1007/BF02811991