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 1485.    HONDA, K., AND TAKAGI, H.  Magnetic-Transformation of Cementite.  Sci. Repts. Tôkohu Imp. Univ., vol. 4, 1915, pp. 161-168; Engineering, vol. 100, 1915, pp. 665-667; Chem. Abs., vol. 10, 1916, p. 740.

       By cooling, the magnetic transformation of cementite begins at 215°, and by heating it ends at the same temperature.  This is the critical temperature of the cementite.  In former experiments steels with a C content 0.14-1.5% showed almost the same critical temperature as the latter steels.  Since the ferromagnetic compounds of Fe have critical temperatures peculiar to them it may be concluded that the carbides may have different critical temperatures.  But, since the various steels, with 0.14-4.2% C, show a single transformation between room temperature and 700°, it is probable that the only carbide existing at ordinary temperature is cementite.

       HONGO, M.  See abs. 1911, 1912, 1913, 1914.