Abstract
The structure state of carbon eutectoid steel has been studied by the in situ neutron diffraction method in the temperature range from room temperature to 800°C. It has been shown that an increase in the temperature is accompanied by a decrease in the concentration of carbon in cementite, whereas its weight fraction and the parameters of the orthorhombic lattice change slightly. The ab initio calculations of the nonstoichiometric carbides Fe3C x (0 < x < 1) indicate that the structure of cementite remains stable upon the appearance of vacancies in the carbon sublattice with a relatively low formation energy. Thus, cementite should be considered as an interstitial phase Fe3C x with a wide homogeneity range.
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Original Russian Text © V.I. Voronin, I.F. Berger, Yu.N. Gornostyrev, V.N. Urtsev, A.R. Kuznetsov, A.V. Shmakov, 2010, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 91, No. 3, pp. 154–157.
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Voronin, V.I., Berger, I.F., Gornostyrev, Y.N. et al. Composition of cementite in the dependence on the temperature. In situ neutron diffraction study and Ab initio calculations. Jetp Lett. 91, 143–146 (2010). https://doi.org/10.1134/S0021364010030094
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DOI: https://doi.org/10.1134/S0021364010030094