Impact toughness of multilayer steel materials at low temperatures

The results of a number of studies show that there are ways to drastically change the temperature dependence of the impact strength of structural steels, which at first glance have a paradoxical character. It was established that when the test temperature decreases down to cryogenic temperatures, the work of failure of impact samples cut in certain directions of rolled products does not change, which indicates the absence of a formal viscous-brittle transition threshold and an increase in material reliability at low temperatures. The reason for this phenomenon is the layered structure formed during the hot batch rolling process, due to which complete failure of impact samples with a U-shaped concentrator does not occur. (paper)