Abstract
The57Fe Mössbauer effect has been widely used to trace the tempering of Fe-C and Fe-N martensitic systems, and has provided much detailed information on the interstitial atom configurations formed during these processes. Carbon and nitrogen atoms are found predominantly to occupy octahedral interstitial positions in the virgin martensite structure. During aging at room temperature, the interstitial atoms tend to agglomerate to regions of high carbon or nitrogen content. Carbon atoms are believed to cluster by jumping from tetrahedral interstitial sites and/or forming regions of ordered Fe4C. Nitrogen atoms agglomerate to regions of ordered Fe16N2. On tempering above room temperature, the sequential precipitation of the ε or η, χ and θ carbides is observed in Fe-C systems. The α′’ (Fe16N2) and γ′ (Fe4N) nitrides are observed during the decomposition of Fe-N martensite. Mössbauer hyperfine spectra associated with each of these structures are described.
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Formerly Professor, Massachusetts Institute of Technology, Cambridge, MA 02139
This paper is based on a presentation made at the “Peter G. Winchell Symposium on Tempering of Steel” held at the Louisville Meeting of The Metallurgical Society of AIME, October 12-13, 1981, under the sponsorship of the TMS-AIME Ferrous Metallurgy and Heat Treatment Committees.
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Kaplow, R., Ron, M. & DeCristofaro, N. Mössbauer Effect Studies of Tempered Martensite. Metall Trans A 14, 1135–1145 (1983). https://doi.org/10.1007/BF02659861
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DOI: https://doi.org/10.1007/BF02659861