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Return to Abstracts of Literature 1500-1749
1595. JACK, K. H. Iron-Nitrogen, Iron-Carbon, and Iron-Carbon-Nitrogen Interstitial Alloys: Their Occurrence in Tempered Martensite. Nature, vol. 158, 1946, pp. 60-61; Chem. Abs., vol. 40, 1946, p. 6392.
Prolonged reaction of CO with Fe nitrides below 500° eliminates N, forming Fe percarbide (C, 30.5-32.1 atomic %). The unit cell is orthorhombic; it contains 4 Fe20C9 molecules. Above 500° the product of the same reaction is cementite. Both of these Fe carbides are metastable; Fe percarbide decomposes in vacuo to C+cementite; cementite to a –Fe+C. The rate of decomposition is negligible below 350°.