Abstract
The metal-to-carbon ratio in the eta phase in 2 1/4 Cr-1 Mo steel exposed to sodium at 566°C for 26,500 h, and probably under a variety of service conditions, approaches four, rather than six, a fact which may be influenced by the presence of Si, O, and perhaps Cr. Silicon is present in the eta phase, probably on a metal sublattice, while oxygen is probably present on the metalloid sublattice. The observation is supported by both structural and compositional data from the literature.
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Leitnaker, J.M., Klueh, R.L. & Laing, W.R. The composition of eta carbide phase in 2 1/4 Cr-1 Mo Steel. Metall Trans A 6, 1949 (1975). https://doi.org/10.1007/BF02646861
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DOI: https://doi.org/10.1007/BF02646861