2012.     KURDYUMOV, G., AND LYSSAK, L.  Application of Single Crystals to the Study of Tempered Martensite.  Jour. Iron Steel Inst. (London), vol. 156, 1947, pp. 29-36; Chem. Abs., vol. 42, 1948, p. 82.

        Martensite tempered at 125-150 hr. has a tetragonal lattice with an axial ratio of about 1.012 and represents the partly decomposed solid solution of the C in a-Fe.  After tempering at 150° a certain amount of C, 0.3-0.5%, remains in solid solution and decreases as the tempering temperature rises until after tempering at temperatures above 300° less than 0.1% C remains in solution.  15 refs.