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Using X-ray diffraction method, the effect of cold (23°C) and warm (200, 400°C) high-pressure torsion (HPT, 6 GPa, N = 1, 3, 5 full revolutions) on the structural parameters and phase composition of single crystals of high-manganese austenitic steel Fe-28Mn-2.7Al-1.3С (wt. %) was investigated. HPT leads to the formation of a misoriented austenitic structure with predominant orientation of {111}-planes in the plane of the anvils. Increase in strain (the number of revolutions) contributes to a decrease in sizes of the coherent scattering regions and microstrain of the crystal lattice and causes an increase in the concentration of stacking faults calculated on the basis of the strain-induced shifting of X-ray lines. Regardless of the deformation temperature and the number of revolutions under HPT, steel retains an austenitic structure with lattice parameter of 3.638 – 3.653 Å. An increase in deformation temperature contributes to a decrease in the austenite crystal lattice parameter that indicates on a partial decarburization of austenite, but only austenite lines are observed on X-ray diffraction patterns. As a result of deformation, the microhardness of the steel increases, and its magnitude significantly depends on the HPT temperature. In the case of cold deformation by HPT, the distribution of microhardness along the diameter of the disk is quasi-homogeneous and varies slightly with increasing number of revolutions. An increase in the deformation temperature is accompanied by the appearance of inhomogeneity in the distribution of the microhardness along the diameter of the disk — the values at the center are lower than that at the periphery.

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Effect of deformation temperature on the structural parameters, phase composition and microhardness of Fe-28Mn-2.7Al-1.3C steel single crystals processed by high-pressure torsion