Composition of cementite in the dependence on the temperature. In situ neutron diffraction study and Ab initio calculations
- 1 February 2010
- journal article
- Published by Pleiades Publishing Ltd in JETP Letters
- Vol. 91 (3), 143-146
- https://doi.org/10.1134/s0021364010030094
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.Keywords
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