Evolution of the Cementite Structure in Carbon Steel:
II. Mssbauer Studies

V. M. Schastlivtsev*, T. I. Tabatchikova*, I. L. Yakovleva*, N. M. Kleinerman*,
V. V. Serikov*, and D. A. Mirzaev**

* Institute of Metal Physics, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 18, Ekaterinburg, 620219 Russia
** Chelyabinsk State Technical University, pr. Lenina 76, Chelyabinsk, 454080 Russia

Received July 7, 1997

Abstract—The structure of cementite in carbon steels (0.89 and 1.5% C) with pearlite microstructure was stud-
ied using Mössbauer spectroscopy. Mössbauer spectra of cementite are found to be significantly affected by
changes in heat-treatment conditions, suggesting that the structure of cementite is changed during annealings,
presumably, because of a rearrangement of its carbon sublattice. The results obtained agree with our previous
conclusion [9] that the cementite structure belongs to a less symmetric space group than the commonly accepted
(Pnma) one.

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