Abstract
DURING an investigation on the heat treatment of mild steel in raw town-gas and ammonia atmospheres1 an unidentified constituent was observed in the surface layers which appeared as a dark-coloured phase visible in the unetched condition. This phase is unstable at room temperature and can be eliminated by slow cooling or reheating. With the limited information available at the time the constituent was presumed to be an iron-carbon-nitrogen compound; positive identification has not been possible until now.
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HOWES, M., JAY, G., SACHS, K. et al. Identification of the High-Temperature Constituent in Mild Steel Surface-Hardened by Carbo-Nitriding. Nature 184, 1312 (1959). https://doi.org/10.1038/1841312a0
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DOI: https://doi.org/10.1038/1841312a0
