3144.     SCHWARTZ, H. A.  Metastability of Cementite.  Trans. Am. Soc. Metals, vol. 23, 1935, pp. 126-150; Chem. Abs., vol. 29, 1935, p. 3959.

        In an Fe-C alloy containing also 0.03% Si and not over 0.04% of other elements, the reaction Fe₃C=3 Fe+C proceeds to the right at all temperatures from 630° to above the eutectic melting point.  The A₁ stable critical point is found 15° above A₁ metastable in this alloy.