70.    ARBUZOV, M., AND KURDYUMOV, G.  [State of Carbon in Tempered Steel.]   Jour. Tech. Phys. (U.S.S.R.), vol. 10, 1940, pp. 1093-1100; Chem. Abs., vol. 35, 1941, p. 2456.

               Monocrystals of austenite (1.4% C) that, after tempering, were in the process of transformation into the regularly oriented martensite crystals were examined by X-rays.  There was found in samples tempered at 130°-300°, a phase produced by the decay of martensite and the remaining austenite.  This phase represents a carbide of Fe, different from Fe₃C.  The lack of sharpness of the interference picture indicates the high degree of dispersion of the low-temperature carbide crystals.  At 300° the low temperature carbide is transformed very slowly into Fe₃C; this transformation is much accelerated at 350°-380°.