Abstract
In vacuum thermocyclic tests, high-temperature X-ray diffraction patterns reveal anomalous thermal lattice deformation (λ-anomalies) of St10 (Ct10), 08H18N10T (08X18H10T), 12H1MF (12X1MФ), and Di-59 (ДИ-59) 10H13G12BS2N2TS2 (10X13Г12БC2H2Ц2) boiler steel within a narrow temperature range. That lattice deformation cannot be explained in terms of familiar phase transitions of types I and II and, according to analysis of the relative integral diffraction-line intensities, is associated with grain-boundary transformations and reorientation of the grains, with consequent modification of the physical and mechanical characteristics and the life of the heat-transfer surfaces.
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