2014.     ---------------.  [KURDYUMOV, G., AND SACHS, G.]  [The Mechanism of Hardening Steel.]  Ztschr. Physik, vol. 64, 1930, pp. 325-343; Chem. Abs., vol. 25, 1931, p. 271.

        Austenite, γ-iron, chilled from 1,100° to room temperature is partly converted into a tetragonal modification, as shown by X-ray diagrams, Debye-Scherrer, from a rotating rod of the material.  The dark ground of the films points to considerable irregularities in the arrangement of the atoms of the crystal lattice.  Tempering leads to formation of martensite.  the lattice distortion (continuous ground) diminishes with increasing temperature and time of tempering.  The relative orientation of the crystals of the austenite modification, the tetragonal phase and the γ-iron has been found and the possible course of the rearrangement is discussed.