Abstract
A complex study of the nature of the little-investigated phenomenon of high-temperature brittleness of steels, i.e., the ductile-brittle transition observed in the temperature range t = (0.92–0.98)tmelt, is described. Regular features in the behavior of mechanical properties of low-alloy steels in this temperature range are considered. The effects of the chemical composition (carbon, impurities), preliminary plastic deformation, high-temperature annealing, and test medium on the mechanical properties are studied. Special features of the fracture mechanism at the studied temperatures are described.
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