Abstract
IN a recent communication1, Heidenreich, Sturkey and Woods report that when martensitic steel is tempered at 200° C. a fine dispersion of hexagonal Fe3N is produced with no trace of cementite. Above 300° C. the reaction product is cementite ; further, Fe3N formed at 200° C. is transformed to cementite by heating at 350° C. The presence of an unknown carbide is reported by Arbusow and Kurdjumow2 when martensite is tempered at 130–300° C. ; above 300° C. this carbide decomposes into cementite.
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References
Heidenreich, Sturkey and Woods, Nature, 157, 518 (1946).
Arbusow and Kurdjumow, J. Phys. U.S.S.R., 5, 101 (1941).
Hägg, Nova Acta Reg. Soc. Sci. Upsaliensis, iv, 7, 1 1929.
Hägg, Z. physikal. Chem., B, 12, 33 (1931).
Hägg, Z. Krist., 89, 92 (1934).
Petch, J. Iron Steel Inst., 149, 143 (1944).
Taylor, J., unpublished work. Lipson and Petch, J. Iron and Steel Inst., 142, 95 (1940).
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JACK, K. Iron-Nitrogen, Iron-Carbon and Iron-Carbon-Nitrogen Interstitial Alloys : their Occurrence in Tempered Martensite. Nature 158, 60–61 (1946). https://doi.org/10.1038/158060d0
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DOI: https://doi.org/10.1038/158060d0
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